DiatomBase
Between brackets is the number of accepted extant species
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- Bacillariophyceae (5 957)
- Subclass Bacillariophyceae incertae sedis (189)
- Subclass Bacillariophycidae (4 408)
- Superorder Bacillariophycanae (4 083)
- Order Achnanthales (438)
- Order Bacillariales (357)
- Order Cymbellales (792)
- Order Dictyoneidales
- Order Lyrellales (15)
- Order Mastogloiales (88)
- Order Naviculales (2 077)
- Suborder Diploneidineae
- Suborder Naviculineae (12)
- Suborder Neidiineae (330)
- Suborder Phaeodactylineae
- Suborder Sellaphorineae
- Family Amphipleuraceae Grunow, 1862 (162)
- Family Diploneidaceae D. G. Mann, 1990 (116)
- Family Metascolioneidaceae S.Blanco & C.E.Wetzel, 2016 (2)
- Family Naviculaceae Kützing, 1844 (866)
- Genus Adlafia G. Moser, H. Lange-Bertalot & D. Metzeltin, 1998 (31)
- Genus Altana M.S.Kulikovskiy, H.Lange-Bertalot & D.Metzeltin, 2012 (3)
- Genus Alveovallum H. Lange-Bertalot & K. Krammer in K. Krammer, 2000
- Genus Amicula A. Witkowski, H. Lange-Bertalot & D. Metzeltin, 2000
- Genus Astartiella A. Witkowski, H. Lange-Bertalot & D. Metzeltin in G. Moser et al., 1998 (1)
- Genus Austariella A. Witkowski, H. Lange-Bertalot & D. Metzeltin, 2000
- Genus Baikalia L.N.Bukhtiyarova & G.V.Pomazkina, 2013 (7)
- Genus Berkella R. Ross & P.A. Sims, 1978
- Genus Buryatia M.S.Kulikovskiy, H.Lange-Bertalot & D.Metzeltin, 2012 (9)
- Genus Caloneis P.T. Cleve, 1894 (61)
- Genus Candollella Gaillon, 1833
- Genus Capartogramma H. Kufferath, 1956 (1)
- Genus Chamaepinnularia H. Lange-Bertalot & K. Krammer in H. Lange-Bertalot & D. Metzeltin, 1996 (11)
- Genus Cocconema C.G. Ehrenberg, 1832 (3)
- Genus Craspedostauros E.J. Cox, 1999 (4)
- Genus Cymatoneis P.T. Cleve, 1894
- Genus Decussata (Patrick) H. Lange-Bertalot, 2000 accepted as Decussiphycus Guiry & Gandhi, 2019
- Genus Diademoides K.-D. Kemp & T.B.B. Paddock, 1990
- Genus Envekadea Van de Vijver, Gligora, Hinz, Kralj & Cocquyt in Gligora et al., 2009 (3)
- Genus Eolimna H. Lange-Bertalot & W. Schiller in W. Schiller & H. Lange-Bertalot, 1997 (6)
- Genus Fistulifera H. Lange-Bertalot, 1997 (1)
- Genus Fontina Beauger, C.E. Wetzel & Ector in Beauger et al., 2022 (1)
- Genus Geissleria H. Lange-Bertalot & D. Metzeltin, 1996 (43)
- Genus Genkalia M.S.Kulikovskiy, H.Lange-Bertalot & D.Metzeltin, 2012 (14)
- Genus Germainiella H. Lange-Bertalot & D. Metzeltin in Metzeltin, Lange-Bertalot & García-Rodríguez, 2005 (9)
- Genus Haslea R. Simonsen, 1974 (21)
- Genus Hippodonta H. Lange-Bertalot, A. Witkowski & D. Metzeltin, 1996 (45)
- Genus Homoeocladia C.A. Agardh, 1827 accepted as Nitzschia A.H. Hassall, 1845 (2)
- Genus Kobayasia H. Lange-Bertalot, 1996
- Genus Kobayasiella H. Lange-Bertalot, 1999 (5)
- Genus Krasskella R. Ross & P.A. Sims, 1978
- Genus Krsticiella Levkov in Levkov et al., 2007 (6)
- Genus Kulikovskiyia S.Roy, Kociolek, Liu & B.Karthick, 2019 (1)
- Genus Kurpiszia A. Witkowski, H. Lange-Bertalot & D. Metzeltin, 2000
- Genus Lacunicula Lange-Bertalot, H., Cavacini, P., Tagliaventi, N. & Alfinito, S., 2003
- Genus Lecohuia H. Lange-Bertalot in U. Rumrich, H. Lange-Bertalot & M. Rumrich, 2000 (2)
- Genus Mastoneis P.T. Cleve, 1894
- Genus Mayamaea H. Lange-Bertalot, 1997 (3)
- Genus Melonavicula T. Christian, 1886
- Genus Membraneis T.B.B. Paddock, 1988 (1)
- Genus Meuniera P.C. Silva in G.R. Hasle & E.E. Syvertsen, 1996
- Genus Michelcostea Van de Vijver, Lange-Bertalot, C.E.Wetzel & Ector, 2017 (1)
- Genus Microcostatus J.R. Johansen & J.C. Sray, 1998 (8)
- Genus Microfissurata Lange-Bertalot, Cantonati & Van de Vijver, 2009 (2)
- Genus Muelleria (J. Frenguelli) J. Frenguelli, 1945 (40)
- Genus Navicula J.B.M. Bory de Saint-Vincent, 1822 (358)
- Species Navicula abaujensis Pantocsek, 1889
- Species Navicula abbottii Cholnoky & Claus, 1961
- Species Navicula abbreviata Grunow in Cleve & Grunow, 1880
- Species Navicula abdita Krasske, 1929
- Species Navicula abdita E.Manguin, 1952 accepted as Chamaepinnularia abdita (Manguin) D.Metzeltin & Lange-Bertalot, 2007
- Species Navicula abducta Manguin, 1952
- Species Navicula abelioensis Foged, 1966
- Species Navicula aberantior R.Simonsen, 2012
- Species Navicula aberrans Cleve-Euler, 1953
- Species Navicula aberrans Simonsen, 1960
- Species Navicula abica Carter, 1966
- Species Navicula abiskoensis Hustedt, 1942 accepted as Placoneis abiskoensis (Hustedt) Lange-Bertalot & D.Metzeltin, 1996
- Species Navicula abnormalis De Toni, 1891
- Species Navicula abnormis Castracane, 1886
- Species Navicula abnormis Grunow in Cleve & Möller, 1878
- Species Navicula abnormis Grunow, 1880
- Species Navicula aboensis (Cleve) Hustedt, 1952 accepted as Navicula torneensis var. aboensis Cleve, 1891
- Species Navicula abonuensis Foged, 1966
- Species Navicula abraensis Foged, 1966
- Species Navicula abrupta (W.Gregory) Donkin, 1870
- Species Navicula abruptoides Hustedt, 1964
- Species Navicula abscondita Hustedt, 1939
- Species Navicula absoluta Hustedt, 1950
- Species Navicula abstrusa Hustedt, 1939
- Species Navicula abuensis Foged, 1966
- Species Navicula abunda Hustedt, 1955
- Species Navicula abundoides Cholnoky, 1963
- Species Navicula abyssinica Grunow, 1886
- Species Navicula acacia Harting, 1852
- Species Navicula accedens Hustedt, 1954
- Species Navicula acceptata Hustedt, 1950 †
- Species Navicula acceptata sensu Foged, 1962
- Species Navicula accommoda Hustedt in Messikommer, 1950
- Species Navicula accomoda sensu Foged, 1958
- Species Navicula accurata Hustedt, 1950
- Species Navicula acephala Héribaud, 1903
- Species Navicula acephala Schoeman, 1973
- Species Navicula achnanthoides Østrup, 1902
- Species Navicula achnanthoides Skvortzow, 1936
- Species Navicula achthera M.H.Hohn & Hellerman, 1963
- Species Navicula acidobionta Lange-Bertalot in Lange-Bertalot & Krammer, 1989
- Species Navicula acidobiontica T.Wanatabe, 2004
- Species Navicula acidophila Cholnoky, 1958
- Species Navicula acnjnjnjus Ehrenberg, 1835
- Species Navicula acrosphaeria (Brébisson) Kützing, 1844 accepted as Pinnularia gibbiformis K.Krammer, 1992
- Species Navicula acrosphaeria A.Schmidt, 1875
- Species Navicula actinota Andrews, 1970
- Species Navicula acuminata (Kützing) Kützing, 1844 accepted as Frustulia acuminata Kützing, 1833
- Species Navicula acuminata (Smith) Ralfs, 1861 accepted as Pinnularia acuminata var. acuminata W. Smith, 1853
- Species Navicula acuminata sensu Wolle, 1890
- Species Navicula acus Cleve in Cleve & Grunow, 1880
- Species Navicula acuta Skvortzov, 1937
- Species Navicula acuta (W.Smith) O'Meara, 1875 accepted as Stauroneis acuta f. acuta W. Smith, 1853
- Species Navicula acuta Meister, 1934 (1935)
- Species Navicula acuta Kützing, 1844
- Species Navicula acuta Schütt, 1896
- Species Navicula acuta Bory, 1822
- Species Navicula acuta Meister, 1919
- Species Navicula acuticuneata D. Metzeltin, H. Lange-Bertalot & F. García-Rodríguez, 2005
- Species Navicula acuticuneatula D. Metzeltin, H. Lange-Bertalot & F. García-Rodríguez, 2005
- Species Navicula acutirostris Hustedt, 1944
- Species Navicula acutissima Hustedt in Schmidt et al., 1934
- Species Navicula acutiuscula Gregory accepted as Pinnularia acutiuscula Gregory, 1856
- Species Navicula adakensis M.Hein
- Species Navicula adamantiformis Archibald, 1966 accepted as Navigiolum adamantiforme (Archibald) Taylor & Lange-Bertalot
- Species Navicula adamata Hustedt, 1952
- Species Navicula adami Pantocsek, 1902
- Species Navicula adampeensis Foged, 1966
- Species Navicula adamsii Cholnoky, 1965
- Species Navicula addaae Pantocsek, 1903
- Species Navicula addicta Hustedt, 1966
- Species Navicula adhaerens Mereschkovsky, 1901
- Species Navicula admenda M.H.Hohn & Hellerman, 1963
- Species Navicula adminensis D.Roberts & McMinn, 1999 accepted as Sabbea adminensis (D.Roberts & McMinn) Van de Vijver, Bishop & Kopalová in Bishop et al., 2019
- Species Navicula adminii D. Roberts & A. McMinn, 1999 accepted as Navicula adminensis D.Roberts & McMinn, 1999
- Species Navicula admissa Hustedt, 1955
- Species Navicula adnata Hustedt, 1937
- Species Navicula adnatoides Cholnoky, 1963
- Species Navicula adnatus Heiden & Kolbe, 1928
- Species Navicula adonis J.Brun, 1889 accepted as Diploneis adonis (J.Brun) Cleve, 1894
- Species Navicula adriatica Grunow, 1860
- Species Navicula adsidua Archibald, 1971
- Species Navicula adumbrata Cholnoky, 1961
- Species Navicula adumbrata M.H.Hohn & Hellerman, 1963
- Species Navicula advena A.Schmidt, 1875
- Species Navicula adversa Krasske, 1938
- Species Navicula adversatrix Pantocsek, 1913
- Species Navicula aedifex Pantocsek, 1913
- Species Navicula aegyptiaca De Toni, 1891
- Species Navicula aegyptiaca Zalat
- Species Navicula aegyptica Salah, 1955
- Species Navicula aemilia Forti, 1913
- Species Navicula aemula Grunow
- Species Navicula aequalis (Ehrenberg) Kützing, 1844 accepted as Pinnularia aequalis Ehrenberg, 1843
- Species Navicula aequatorialis Heiden in Heiden & Kolbe, 1928
- Species Navicula aequinoctialis Montagne, 1850
- Species Navicula aequorea Hustedt, 1939
- Species Navicula aerophila Krasske, 1932 accepted as Humidophila aerophila (Krasske) Lowe, Kociolek, Johansen, Van de Vijver, Lange-Bertalot & Kopalová, 2014
- Species Navicula aestimata Hustedt, 1964
- Species Navicula aestiva Donkin, 1858 accepted as Diploneis aestiva (Donkin) Cleve, 1894
- Species Navicula aestuarii Brébisson ex Kützing, 1849
- Species Navicula aestuarii Cleve
- Species Navicula affinis Ehrenberg, 1843
- Species Navicula affinis sensu Gregory, 1854
- Species Navicula affinis sensu W. Smith, 1853
- Species Navicula affirmata Leuduger-Fortmorel, 1879
- Species Navicula africana Ehrenberg, 1839
- Species Navicula africana Hustedt, 1910
- Species Navicula africana Petit, 1876
- Species Navicula afroalpina Gasse, 1978
- Species Navicula agatkae Witkowski
- Species Navicula agellus Ehrenberg, 1840
- Species Navicula aggerica E.Reichardt, 1982
- Species Navicula aggesta Hustedt, 1966
- Species Navicula aglaos Hohn, 1966
- Species Navicula agma M.H.Hohn & Hellerman, 1963
- Species Navicula agmastriata Hohn & Hellerman, 1966 accepted as Staurophora agmastriata (Hohn & Hellerman) Desianti & Potapova, 2015
- Species Navicula agnewii Cholnoky, 1962
- Species Navicula agnita Hustedt, 1955
- Species Navicula agnita Hustedt, 1966
- Species Navicula agrestiformis H.P. Gandhi, 1998 accepted as Navicula agrestiformis H.P.Gandhi ex Karthick, 2020
- Species Navicula agrestiformis H.P.Gandhi ex Karthick, 2020
- Species Navicula agrestis Hustedt, 1936
- Species Navicula agulhasica Cholnoky, 1959
- Species Navicula ahmedabadensis VanLandingham, 1975
- Species Navicula aikenensis Patrick, 1959 accepted as Geissleria punctifera (Hustedt) Metzeltin, Lange-Bertalot & García-Rodríguez, 2005
- Species Navicula airdevronsixii D.E. Kellogg, M. Stuiver, T.B. Kellogg & G.H. Denton, 1980
- Species Navicula aitchelbee L.L.Bahls, 2012
- Species Navicula ajajensis Skabichevskii, 1936
- Species Navicula ajenaensis Foged, 1966
- Species Navicula akebergii
- Species Navicula aketechiensis Foged, 1966
- Species Navicula akimensis Foged, 1966
- Species Navicula aktinoides Skuja, 1937
- Species Navicula alandica
- Species Navicula alaskana Patrick & Freese, 1961
- Species Navicula alata Ehrenberg, 1840 accepted as Entomoneis alata (Ehrenberg) Ehrenberg, 1845
- Species Navicula alata Cleve in Cleve & Moller, 1882
- Species Navicula albanica Krenner, 1926
- Species Navicula albinensis Grunow, 1884
- Species Navicula albinensis sensu Cleve-Euler, 1939
- Species Navicula alea M.H.Hohn & Hellerman, 1963
- Species Navicula aleemi Hustedt in Hustedt & Aleem, 1951
- Species Navicula aleemii Hustedt, 1951
- Species Navicula aleksandrae Lange-Bertalot, Bogaczewicz-Adamczak & Witkowski, 2003
- Species Navicula algeriensis Montagne, 1846
- Species Navicula algida Grunow, 1884
- Species Navicula algor M.H.Hohn & Hellerman, 1963
- Species Navicula aliena Krasske, 1938 accepted as Chamaepinnularia aliena (Krasske) B.Van de Vijver & R. Le Cohu in Van de Vijver et al., 2002
- Species Navicula alineae Lange-Bertalot, 2000
- Species Navicula alisoviana (Skvortzow) A.Tuji, 2003 accepted as Navicula viridula var. alisoviana Skvortzow, 1929
- Species Navicula allista Hohn & Hellerman, 1966
- Species Navicula allmaniana (Gregory) Ralfs in Pritchard, 1861 accepted as Pinnularia allmaniana Gregory, 1857
- Species Navicula allorgei É.Manguin, 1952
- Species Navicula alluviana Heiden, 1900
- Species Navicula alpestris Grunow, 1860 accepted as Caloneis alpestris (Grunow) Cleve, 1894
- Species Navicula alpha Cleve, 1893
- Species Navicula alpha Cholnoky, 1955
- Species Navicula alpha Heinzerling, 1908
- Species Navicula alpina (W.Smith.) Grunow, 1860 accepted as Pinnularia alpina W.Smith, 1853
- Species Navicula alternans Schumann, 1867
- Species Navicula alterofasciata Kooijman, 1982
- Species Navicula altiplanensis Rumrich & H. Lange-Bertalot in U. Rumrich, H. Lange-Bertalot & M. Rumrich, 2000
- Species Navicula amabilis Hustedt, 1966
- Species Navicula ambigua Ehrenberg, 1843 accepted as Craticula ambigua (Ehrenberg) D.G.Mann, 1990
- Species Navicula ambigua sensu Pantocsek, 1902
- Species Navicula ambigua Smith in A. Schmidt, 1897
- Species Navicula americana Ehrenberg, 1843 accepted as Sellaphora americana (Ehrenberg) D.G.Mann, 1989
- Species Navicula americana F.W. Mills, 1934
- Species Navicula amerinda Carter, 1966
- Species Navicula amica Cleve & Grunow in Cleve, 1881
- Species Navicula amici E.M. Nelson, 1910
- Species Navicula amicii J.W. Bailey, 1851
- Species Navicula amicii E.M. Nelson, 1911
- Species Navicula amicorum Grunow
- Species Navicula ammophila Grunow, 1862
- Species Navicula amnicola M.H.Hohn & Hellerman, 1963
- Species Navicula amoena Cleve manuscript in Cleve, 1894
- Species Navicula amoena Manguin ex Kociolek & Reviers, 1996
- Species Navicula amoenaeformis Manguin, 1964
- Species Navicula amphibia Jousé, 1939
- Species Navicula amphibola Cleve, 1891
- Species Navicula amphicephala (Ehrenberg) De Toni, 1891 accepted as Pinnularia amphicephala Ehrenberg, 1870
- Species Navicula amphiceropsis H. Lange-Bertalot & Rumrich in U. Rumrich, H. Lange-Bertalot & M. Rumrich, 2000
- Species Navicula amphiceros (Ehrenberg) De Toni, 1891 accepted as Pinnularia amphiceros Ehrenberg, 1854
- Species Navicula amphiceros Kützing, 1844 accepted as Navicula rhynchotella Lange-Bertalot, 1993
- Species Navicula amphigomphus Ehrenberg, 1843 accepted as Neidium iridis var. amphigomphus (Ehrenberg) A.Mayer, 1917
- Species Navicula amphilepta Ehrenberg, 1857
- Species Navicula amphioxys Kützing, 1844 accepted as Cymbella amphioxys Cleve, 1894
- Species Navicula amphioxys Ehrenberg, 1843
- Species Navicula amphioxys sensu Kützing, 1844
- Species Navicula amphioxys sensu Westendorp, 1845-1859
- Species Navicula amphipleuroides Hustedt, 1955
- Species Navicula amphiprora (Ehrenberg) Kützing, 1844 accepted as Pinnularia amphiprora Ehrenberg, 1843
- Species Navicula amphirhynchus Ehrenberg, 1843 accepted as
- Species Navicula amphirrhina Ehrenberg, 1842
- Species Navicula amphirynchus sensu Donkin, 1871
- Species Navicula amphisbaena Bory de Saint Vincent, 1824
- Species Navicula amphisbaena sensu W. Smith, 1853
- Species Navicula amphisphenia Ehrenberg, 1843
- Species Navicula amphistylus (Ehrenberg) Kützing, 1849 accepted as Pinnularia amphistylus Ehrenberg, 1845
- Species Navicula amphora Ehrenberg, 1832
- Species Navicula amphora Brun, 1891
- Species Navicula amphoroides O'Meara, 1867
- Species Navicula amplectens Hustedt in Schmidt et al., 1934
- Species Navicula ampliata Ehrenberg, 1854 accepted as Neidium ampliatum (Ehrenberg) Krammer, 1985
- Species Navicula amygdalina Hustedt in Schmidt et al., 1936
- Species Navicula anassae Cholnoky, 1957
- Species Navicula anatis Hohn & Hellerman, 1963
- Species Navicula anca J.R.Carter, 1964
- Species Navicula anceps (Ehrenberg) Mann, 1907 accepted as Stauroneis anceps f. anceps Ehrenberg, 1843
- Species Navicula anceps (Kützing) Ehrenberg, 1838 accepted as Frustulia anceps Kützing, 1833 (1834)
- Species Navicula ancilla Hendey, 1964
- Species Navicula ancisa Hustedt, 1953 accepted as Dorofeyukea ancisa (Hustedt) Kulikovskiy & Kociolek in Kulikovskiy et al., 2019
- Species Navicula ancora Weisse in Eichwald, 1844
- Species Navicula ancyli Fontell in manus. Cleve-Euler, 1953
- Species Navicula anderabensis Foged, 1959
- Species Navicula anderssonii Cleve, 1881
- Species Navicula andesitica Pantocsek, 1889
- Species Navicula andicola (Cleve) Schütt, 1896 accepted as Schizonema andicola (Cleve) Kuntze, 1898
- Species Navicula andium Frenguelli, 1942
- Species Navicula andranokelyna Manguin, 1949
- Species Navicula andrussowii Pantocsek, 1902
- Species Navicula anenuta Fusey, 1953
- Species Navicula angarae D.Metzeltin, M.S.Kulikovskiy & H.Lange-Bertalot, 2012
- Species Navicula angelica Ralfs, 1861
- Species Navicula angelorum Cleve
- Species Navicula angleana Lauby, 1910
- Species Navicula anglica Ralfs, 1861 accepted as Placoneis elginensis (Gregory) E.J.Cox, 1988
- Species Navicula anglica sensu Donkin, 1871
- Species Navicula anglophila Lange-Bertalot, 1987 accepted as Placoneis anglophila (Lange-Bertalot) Lange-Bertalot, 2005
- Species Navicula angolensis Cholnoky, 1966
- Species Navicula angulata Quekett, 1848
- Species Navicula angulosa Gregory, 1856
- Species Navicula angulosa sensu Cleve-Euler, 1915
- Species Navicula angusta Grunow, 1860
- Species Navicula angustata W.Smith, 1853 accepted as Cymbopleura angustata (W.Smith) Krammer, 2003
- Species Navicula angustata Ehrenberg, 1842
- Species Navicula angustata Ehrenberg, 1843
- Species Navicula angustefasciata Østrup, 1920
- Species Navicula angustissima Hustedt in Schmidt et al., 1934
- Species Navicula anhuiensis Yang, 1994
- Species Navicula ankobraensis Foged, 1966
- Species Navicula anna Hendey, 1973
- Species Navicula annexa Hustedt, 1966
- Species Navicula annulata Grunow, 1880 accepted as Geissleria annulata (Grunow) Lange-Bert. & Metzeltin, 1996
- Species Navicula anomala (Ehrenberg) De Toni, 1891 accepted as Pinnularia anomala Ehrenberg, 1854
- Species Navicula anopaia Cholnoky, 1961
- Species Navicula antarctica Frenguelli, 1960
- Species Navicula antarctica Karsten, 1905
- Species Navicula antarctica (Ehrenberg) De Toni, 1891 accepted as Pinnularia antarctica Ehrenberg, 1854
- Species Navicula antediluviana Hustedt, 1955 † accepted as Witkowskia antediluviana (Hustedt) Kulikovskiy, Glushchenko, Mironov & Kociolek, 2024 †
- Species Navicula anthracis Cleve & Brun in Brun & Tempère, 1889
- Species Navicula antillarum (Cleve & Grunow) Mann, 1925 accepted as Alloioneis antillarum Cleve & Grunow in Cleve, 1878
- Species Navicula antinitescens M.Peragallo, 1908
- Species Navicula antiqua Cleve-Euler, 1932
- Species Navicula antiqua Skvortzow, 1937
- Species Navicula antiqua Grunow in Cleve & Möller, 1878
- Species Navicula antiqua Schmidt ex Cleve & Möller, 1879
- Species Navicula antonii Lange-Bertalot, 2000
- Species Navicula antonioides Van de Vijver, Jarlman & Lange-Bert., 2010
- Species Navicula antverpiensis Van de Vijver & Lange-Bert., 2009
- Species Navicula aoboensis
- Species Navicula aokebergii Cleve-Euler, 1953
- Species Navicula aolandica (Cleve-Euler) Cleve-Euler, 1953 accepted as Navicula obtusata var. aolandica Cleve-Euler, 1934
- Species Navicula aperta Schumann, 1867
- Species Navicula aperta Guermeur, 1954
- Species Navicula aperta Frenguelli, 1923 accepted as Pinnularia aperta var. aperta (Frenguelli) F.W. Mills, 1934
- Species Navicula aperta (Ehrenberg) De Toni, 1891 accepted as Pinnularia apicata Ehrenberg, 1854
- Species Navicula apiculata Brébisson, 1854
- Species Navicula apiculata Cleve-Euler, 1949
- Species Navicula apiculata sensu Gregory, 1856
- Species Navicula apiculata sensu Donkin, 1871
- Species Navicula apiculatoreinhardtii M.B.Edlund & N.Soninkhishig, 2009
- Species Navicula apis Ehrenberg accepted as Pinnularia apis Ehrenberg, 1843
- Species Navicula apis sensu Donkin, 1871
- Species Navicula apis sensu Schmidt, 1872
- Species Navicula aponina Kützing, 1844 accepted as Brachysira aponina Kützing, 1836
- Species Navicula appendiculata (C.Agardh) Kützing, 1844 accepted as Pinnularia appendiculata (C.Agardh) Schaarschmidt, 1881
- Species Navicula appendiculata sensu Pantocsek, 1892
- Species Navicula appendiculata Rabenhorst, 1853
- Species Navicula applanata Hustedt, 1964
- Species Navicula applicita Hustedt, 1964
- Species Navicula applicitoides Hustedt, 1964
- Species Navicula apposita Hustedt, 1954
- Species Navicula approximata Greville, 1859 accepted as Lyrella approximata (Greville) D.G.Mann, 1990
- Species Navicula approximata sensu Hendey, 1958
- Species Navicula approximatella Hustedt
- Species Navicula approximatoides Hustedt, 1987
- Species Navicula apsteinii Pantocsek, 1902
- Species Navicula apta Hustedt, 1955
- Species Navicula aquaeductae (Krasske) Krasske, 1925
- Species Navicula aquaeducti
- Species Navicula aquaedurae Lange-Bertalot, 1993
- Species Navicula aquintaniae
- Species Navicula aquosa Archibald, 1966
- Species Navicula arabica Grunow ex A.Schmidt, 1875
- Species Navicula aradina Pantocsek, 1892
- Species Navicula arata Grunow, 1882 †
- Species Navicula arata sensu Hustedt, 1937
- Species Navicula arata sensu Cleve-Euler in Backman & Cleve-Euler, 1922
- Species Navicula araucaniana Frenguelli, 1934 †
- Species Navicula arcana Pantocsek, 1913
- Species Navicula archeriana O'Meara, 1874
- Species Navicula archibaldiana Foged, 1975
- Species Navicula arctica Cleve, 1873
- Species Navicula arctissima Schmidt
- Species Navicula arctotenelloides Lange-Bertalot & Metzeltin, 1996
- Species Navicula arcuata Heiden, 1928 accepted as Humidophila arcuata (Heiden) Lowe, Kociolek, Johansen, Van de Vijver, Lange-Bertalot & Kopalová, 2014
- Species Navicula arcuata Pantocsek, 1892 †
- Species Navicula arcus Ehrenberg, 1836
- Species Navicula ardis Hohn, 1966
- Species Navicula ardua Mann, 1907
- Species Navicula arenaria Donkin, 1861
- Species Navicula arenariaeformis Pantocsek, 1889
- Species Navicula arenicola Grunow, 1882
- Species Navicula arenicola sensu Cleve-Euler in Backman & Cleve-Euler, 1922
- Species Navicula arenosa Lauby, 1909
- Species Navicula arenula M.H.Hohn & Hellerman, 1963
- Species Navicula areolata Hustedt, 1952
- Species Navicula areschougiana Grunow
- Species Navicula argestris Hustedt, 1937
- Species Navicula arguens Skvortzow, 1937
- Species Navicula argunensis Skvortzow, 1938
- Species Navicula argutiola M.H.Hohn & Hellerman, 1963
- Species Navicula argutula Hustedt, 1955
- Species Navicula arida Bock, 1963
- Species Navicula ariiensis H.Okuno, 1952 †
- Species Navicula arkona Lange-Bertalot & Witkowski, 2001 †
- Species Navicula armata J.R.Carter, 1964
- Species Navicula armoricana Amossé, 1932
- Species Navicula arraniensis O'Meara, 1875
- Species Navicula artemidis Cholnoky, 1957
- Species Navicula artificiosa Heiden in Heiden & Kolbe, 1928
- Species Navicula arvensiformis Carter, 1970
- Species Navicula arvensis Hustedt, 1937
- Species Navicula arvensoides Hustedt, 1945
- Species Navicula arverna M.Peragallo & Héribaud-Joseph, 1893
- Species Navicula asanwinsoensis Foged, 1966
- Species Navicula ascensionensis Van de Vijver, Wilfert, D.M. John & Lange-Bertalot, 2018
- Species Navicula asellus Weinhold ex Hustedt, 1934
- Species Navicula ashantiensis Foged, 1966
- Species Navicula asiatica Meister, 1934 (1935)
- Species Navicula asklepieionensis Foged, 1982
- Species Navicula aspeitiaae Pantocsek, 1913
- Species Navicula aspera Ehrenberg, 1840
- Species Navicula aspera sensu Donkin, 1872
- Species Navicula aspera sensu Schmidt in Schmidt et al., 1876
- Species Navicula aspergilla Carter & Denny, 1992
- Species Navicula aspersa Hustedt, 1966
- Species Navicula asperula (Ehrenberg) Kützing, 1844 accepted as Pinnularia asperula Ehrenberg, 1845
- Species Navicula associata Lange-Bertalot, 2001 †
- Species Navicula assula Cholnoky, 1963
- Species Navicula assuloides Giffen, 1973
- Species Navicula astrolabensis Hendey, 1937
- Species Navicula astutus Fontell in manus., Cleve-Euler, 1953
- Species Navicula asymbasia M.H.Hohn & Hellerman, 1963
- Species Navicula asymetrica Pantocsek, 1892
- Species Navicula asymmetrica Cleve, 1883
- Species Navicula atacamae Hustedt, 1927 † accepted as Brachysira atacamae (Hustedt) D.G.Mann, 1990 †
- Species Navicula atacamana Patrick, 1961
- Species Navicula atalos Hohn, 1966
- Species Navicula atasensis Simonsen, 1987
- Species Navicula athenae A. Witkowski, H. Lange-Bertalot & D. Metzeltin, 2000
- Species Navicula atlantica A.Schmidt, 1874 accepted as Navicula lyra f. atlantica Schmidt, 1874
- Species Navicula atomarius Skvortzow, 1936
- Species Navicula atomoides Grunow, 1880 accepted as Navicula minima Grunow, 1880
- Species Navicula atomus (Kützing) Grunow, 1860 accepted as Mayamaea atomus (Kützing) Lange-Bertalot, 1997
- Species Navicula atomus sensu Schumann, 1864
- Species Navicula atomus sensu Boye Petersen, 1915
- Species Navicula attenuata (Kützing) Kützing, 1844 accepted as Frustulia attenuata Kützing, 1834
- Species Navicula attwoodii M. Peragallo in Tempère & Peragallo, 1908
- Species Navicula atwateri Seddon, Witkowski & Hemphill-Haley, 2011
- Species Navicula aubertii Héribaud in Héribaud et al., 1920
- Species Navicula aucklandica Grunow, 1863
- Species Navicula aueri Krasske, 1949 accepted as Stauroneis aueri (Krasske) Lange-Bertalot in Lange-Bertalot, Kulbs, Lauser, Norpel-Schempp & Willmann, 1996
- Species Navicula augustissima Hustedt, 1935
- Species Navicula aulacophaena Ehrenberg, 1854
- Species Navicula aurangabadensis Sarode & Kamat, 1984
- Species Navicula aurantiaca Schoeman, 1973
- Species Navicula auriculata Hustedt, 1944
- Species Navicula aurora Sovereign, 1958
- Species Navicula australasiatica Y.Li et Metzeltin iin Li et al., 2020
- Species Navicula australica (Schmidt in Schmidt et al.) Cleve, 1895 accepted as Navicula lyra var. australica Schmidt in Schmidt et al., 1874
- Species Navicula australis (Ehrenberg) De Toni, 1891 accepted as Pinnularia australis Ehrenberg, 1845
- Species Navicula australis (Petit) M. Peragallo, 1903 accepted as Stauroneis velata var. australis Petit, 1888
- Species Navicula australoceanica A.Witkowski, C.Riaux-Gobin & G.Daniszewska-Kowalczyk, 2010
- Species Navicula australomediocris Lange-Bertalot & R.Schmidt, 1990
- Species Navicula australoshetlandica Van de Vijver, 2011
- Species Navicula austrocollegarum Lange-Bertalot & R.Voigt, 2001
- Species Navicula austroshetlandica Carlson, 1913
- Species Navicula avenacea (Rabenhorst) Brébisson ex Grunow, 1878 accepted as Pinnularia radiosa var. avenacea Rabenhorst, 1864
- Species Navicula avenacea sensu Pantocsek, 1902
- Species Navicula avenaceoides H.P.Gandhi, 1964
- Species Navicula avittata (Cholnoky) Cholnoky, 1968 accepted as Navicula subcostulata var. avittata Cholnoky, 1959
- Species Navicula avium (Tiffany, Herwig et Sterrenburg in Sterrenburg et al.) Yuhang Li & Kuidong Xu, 2017
- Species Navicula avonensis Round, 1966
- Species Navicula baardsethii Cleve-Euler, 1949
- Species Navicula baccata Brun in Brun & Tempère, 1889
- Species Navicula bachmannii Hustedt, 1961
- Species Navicula bacillaris Gregory, 1856 accepted as Caloneis bacillaris (Gregory) Cleve
- Species Navicula bacillaris (Ehrenberg) De Toni, 1891 accepted as Pinnularia bacillaris Ehrenberg, 1854
- Species Navicula bacillifera Pantocsek, 1889
- Species Navicula bacilliformis Grunow, 1880
- Species Navicula bacilloides Hustedt, 1945
- Species Navicula bacillum Ehrenberg, 1839
- Species Navicula bacillum sensu Gregory, 1856
- Species Navicula bacterium Frenguelli, 1923
- Species Navicula bacula M.H.Hohn & Hellerman, 1963
- Species Navicula baculus Cleve, 1883
- Species Navicula baddensis Gasse, 1978
- Species Navicula bahiensis Zimmermann, 1918
- Species Navicula bahuensoides Foged, 1975
- Species Navicula bahusiensis (Grunow) Cleve, 1895 accepted as Navicula minuscula var. bahusiensis Grunow, 1880
- Species Navicula bahusiensis sensu Ostrup, 1895
- Species Navicula bahusiensis sensu Cleve-Euler, 1915
- Species Navicula baicalcollegarum Kulikovskiy & Lange-Bertalot, 2012
- Species Navicula baicalconcentrica M.S.Kulikovskiy, H.Lange-Bertalot & D.Metzeltin, 2012
- Species Navicula baicalensis Skvortzov & Meyer, 1928
- Species Navicula baicalirmengardis Kulikovskiy Lange-Bertalot & Metzeltin, 2012
- Species Navicula baicalofrigidicola D.Metzeltin, M.S.Kulikovskiy & H.Lange-Bertalot, 2012
- Species Navicula baicalogracilis M.S.Kulikovskiy, H.Lange-Bertalot & D.Metzeltin, 2012
- Species Navicula baicaloradiosa Kulikovskiy Lange-Bertalot & Metzeltin, 2012
- Species Navicula baileyana Grunow ex A.Schmidt, 1874
- Species Navicula baileyensis Grunow in Cleve & Möller, 1879
- Species Navicula baileyi Ehrenberg
- Species Navicula baileyi Cholnoky, 1968
- Species Navicula bainii Cholnoky, 1962
- Species Navicula bakiana A.Witkowski & Lange-Bertalot, 2009
- Species Navicula bakievae Metzeltin, Kulikovskiy & Lange-Bertalot, 2012
- Species Navicula balatonis Pantocsek, 1902
- Species Navicula balcanica Hustedt in Schmidt et al., 1934 accepted as Placoneis balcanica (Hustedt) H. Lange-Bertalot, D. Metzeltin & Levkov in D. Metzeltin, H. Lange-Bertalot & F. García-Rodríguez, 2005
- Species Navicula baldjickiensis Heiden, 1905
- Species Navicula balearica (Cleve) Cleve, 1894 accepted as Stauroneis balearica Cleve, 1881
- Species Navicula baleyana
- Species Navicula balfouriana (Grunow ms., Cleve) M.Peragallo, 1903 accepted as Pinnularia balfouriana var. balfouriana Grunow ex Cleve, 1895
- Species Navicula balliformis Mereschkowsky, 1903
- Species Navicula balnearis Grunow accepted as Fallacia balnearis (Grunow) A.Witkowski, H.Lange-Bertalot & D.Metzeltin, 2000
- Species Navicula baltica Ehrenberg, 1838
- Species Navicula baltica Grunow in A. Schmidt, 1874
- Species Navicula bamboiensis Foged, 1966
- Species Navicula bannajensis Boye Petersen, 1946
- Species Navicula bansoensis Foged, 1966
- Species Navicula barbadense Vickers, 1905
- Species Navicula barbadensis Ehrenberg, 1854 accepted as Pinnularia barbadensis Ehrenberg, 1854
- Species Navicula barbara Heiden, 1928
- Species Navicula barbarica Hustedt, 1949
- Species Navicula barberi Hendey, 1964
- Species Navicula barberiana Foged, 1979
- Species Navicula barbitos A.Schmidt, 1888
- Species Navicula barclayana Gregory, 1857
- Species Navicula barentsii Foged, 1964
- Species Navicula barkeriana O'Meara, 1875
- Species Navicula barodensis H.P. Gandhi, 1998 accepted as Navicula barodensis H.P.Gandhi ex Karthick, 2020
- Species Navicula barodensis H.P.Gandhi ex Karthick, 2020
- Species Navicula barrowiana Patrick & Freese, 1961
- Species Navicula bartholomei Cleve, 1878
- Species Navicula basaltaeformis
- Species Navicula basaltaeproxima J.Brun & Héribaud-Joseph
- Species Navicula basilica Brun, 1891
- Species Navicula basilica Pantocsek, 1892
- Species Navicula bastianii M.Peragallo, 1909
- Species Navicula bastowii Hustedt, 1955
- Species Navicula bauemleri Pantocsek
- Species Navicula bawdiaensis Foged, 1966
- Species Navicula bayleana accepted as Navicula baileyana Grunow ex A.Schmidt, 1874
- Species Navicula bdesma Hohn, 1961
- Species Navicula beaufortiana Hustedt, 1955
- Species Navicula beccariana Grunow, 1886
- Species Navicula beckii Pantocsek, 1889
- Species Navicula begeri Krasske, 1932 accepted as Chamaepinnularia begeri (Krasske) Lange-Bertalot in Lange-Bertalot & Metzeltin, 1996
- Species Navicula beketowii Mereschkowsky, 1902
- Species Navicula bella Hustedt, 1937
- Species Navicula bella Karajeva, 1964
- Species Navicula bellatii Frenguelli, 1953
- Species Navicula belliatula Archibald, 1971
- Species Navicula bellissima Hustedt, 1966
- Species Navicula bendaensis Schrader & Fenner, 1976
- Species Navicula bengalensis Grunow in Schmidt et al., 1875
- Species Navicula bergenensis Hohn, 1952
- Species Navicula bergeni Hohn, 1952
- Species Navicula bergeri
- Species Navicula bergii Cleve-Euler, 1953
- Species Navicula berriati Héribaud-Joseph
- Species Navicula bertelsenii Foged, 1966
- Species Navicula bertrandi Lauby, 1910
- Species Navicula besarensis Giffen, 1980
- Species Navicula beta Cleve, 1895
- Species Navicula beyrichiana A.W.F.Schmidt, 1881 accepted as Diploneis beyrichiana (A.Schmidt) A.Amossé, 1924
- Species Navicula biaculeata Cleve-Euler, 1949
- Species Navicula biagnita Simonsen, 1987
- Species Navicula biakensis Cholnoky, 1963
- Species Navicula bialbata H. Peragallo & M. Peragallo, 1898
- Species Navicula biblos Cleve, 1891
- Species Navicula bicapitata Lagerstedt, 1873 accepted as Pinnularia bicapitata (Lagerstedt) Cleve, 1891
- Species Navicula bicapitata O'Meara, 1875
- Species Navicula bicapitata Hajós, 1959
- Species Navicula bicapitata sensu G.S. West, 1909
- Species Navicula bicapitata Heiden & Kolbe, 1928
- Species Navicula bicapitata Jousé, 1936
- Species Navicula bicapitellata Hustedt, 1925
- Species Navicula bicarinata Ehrenberg
- Species Navicula bicephala Hustedt, 1952
- Species Navicula bicephaloides Van de Vijver & Zidarova, 2011
- Species Navicula biceps Bory, 1827
- Species Navicula biceps sensu Schmidt in Schmidt et al., 1876
- Species Navicula biceps sensu Schmidt in Schmidt et al., 1876
- Species Navicula biceps sensu Schmidt in Schmidt et al., 1877
- Species Navicula biclavata Cleve & Grove, 1891
- Species Navicula biconfusa VanLandingham, 1975
- Species Navicula biconica Patrick, 1959
- Species Navicula biconifera Morren, 1835
- Species Navicula biconstricta Grunow, 1878
- Species Navicula biconstricta Grove & Sturt, 1887
- Species Navicula biconstricta (Grunow) M.Peragallo, 1903 accepted as Navicula trochus var. biconstricta Grunow, 1878
- Species Navicula bicontracta Østrup, 1902
- Species Navicula bicontracta sensu Hustedt, 1930
- Species Navicula bicuneata Grunow, 1860
- Species Navicula bicuneolus Metzeltin & Lange-Bertalot, 1998
- Species Navicula bicurvata De Toni, 1891
- Species Navicula bicuspidata Cleve & Grunow in Cleve, 1881
- Species Navicula biddulphioides Hustedt, 1966
- Species Navicula bidentula J.B.Petersen, 1928
- Species Navicula bievexa Hohn, 1961
- Species Navicula bifax Hohn & Hellerman, 1966
- Species Navicula bifissa Schmidt in Schmidt et al., 1897
- Species Navicula biflexa (A.Schmidt) Giffen, 1970 accepted as Cocconeis biflexa A.Schmidt, 1874
- Species Navicula biformis (Grunow) Mann, 1925 accepted as Stauroneis biformis var. biformis Grunow, 1863
- Species Navicula bifrons Ehrenberg, 1833
- Species Navicula bifurcatula Hustedt, 1964
- Species Navicula bifurcatum (Heiden in Schmidt et al.) F.W. Mills, 1934 accepted as Neidium bifurcatum Heiden in Schmidt et al., 1906
- Species Navicula bigemmata Mann, 1925
- Species Navicula biglobosa Schumann, 1867
- Species Navicula bihastata A.Mann, 1924
- Species Navicula bilineata Schumann, 1862
- Species Navicula bilobata Leuduger-Fortmorel, 1879
- Species Navicula bimaculata Pantocsek, 1889
- Species Navicula binaria Schmidt in Schmidt et al., 1875
- Species Navicula binocularis Smejev, 1872
- Species Navicula binodis Ehrenberg, 1840 accepted as Neidiomorpha binodis (Ehrenberg) M.Cantonati, Lange-Bertalot & N.Angeli, 2010
- Species Navicula binodulosa Sullivan & Reimer, 1975
- Species Navicula bintila Carter & Denny, 1982
- Species Navicula binziana T.Marsson, 1900
- Species Navicula bioculata Grunow ex A.Schmidt, 1881 accepted as Fallacia bioculata (Grunow ex A.Schmidt) D.G.Mann, 1990
- Species Navicula bipatens Heiden, 1906
- Species Navicula bipectinalis Schumann, 1867
- Species Navicula bipennata
- Species Navicula bipodis
- Species Navicula bipunctata Bory, 1827
- Species Navicula bipunctata O'Meara, 1872
- Species Navicula bipunctata Grunow in Van Heurck, 1880
- Species Navicula bipustulata Mann, 1925
- Species Navicula birhis Hohn, 1961
- Species Navicula birostrata Gregory, 1855
- Species Navicula birostris (Ehrenberg) Ralfs in Pritchard, 1861 accepted as Pinnularia birostris Ehrenberg, 1842
- Species Navicula biscalaris Brebisson in litt., Janisch ex W. Smith, 1856
- Species Navicula biseriata Petit, 1877
- Species Navicula biseriata Brockmann, 1952
- Species Navicula bishti Singh, Nautiyal & Vimal, 1976
- Species Navicula biskanteri Hustedt, 1939
- Species Navicula bistriata Leuduger-Fortmorel, 1879 accepted as Stauroneis bistriata Leuduger-Fortmorel, 1879
- Species Navicula bisulcata Lagerstedt, 1873 accepted as Neidium bisulcatum (Lagerstedt) Cleve, 1894
- Species Navicula bita Hohn, 1961
- Species Navicula bitruncata Turpin, 1816-1830
- Species Navicula bituminosa Pantocsek
- Species Navicula bivittata Pantocsek, 1889 accepted as Caloneis permagna (Bailey) Cleve, 1894
- Species Navicula biwaensis (Skvortzov) T.Ohtsuka, 2002 accepted as Navicula rostellata var. biwensis Skvortzow, 1936
- Species Navicula bjoernoeyaensis D.Metzeltin, A.Witkowski & Lange-Bertalot, 1996
- Species Navicula blanda A.Schmidt, 1874 accepted as Navicula ergadensis (Gregory) Ralfs, 1861
- Species Navicula blasii Frenguelli, 1938
- Species Navicula blazencicae Z. Levkov & S. Krstic in Levkov, Krstic, Metzeltin & Nakov, 2007
- Species Navicula blazenciciae Z.Levkov & S.Krstic, 2007
- Species Navicula bleischiana Janisch & Rabenhorst, 1863
- Species Navicula bleischii Janisch in Schmidt et al., 1877
- Species Navicula blessingii Gran, 1900
- Species Navicula blotii Héribaud in Héribaud et al., 1920
- Species Navicula bodosensis Pantocsek
- Species Navicula boeckii (Ehrenberg) Heiberg, 1863 accepted as Cocconema boeckii Ehrenberg, 1838
- Species Navicula boergesenii Østrup, 1913
- Species Navicula bogotensis Grunow, 1876 accepted as Pinnularia bogotensis (Grunow) Cleve, 1895
- Species Navicula bohemica Ehrenberg, 1854 accepted as Anomoeoneis costata (Kützing) Hustedt, 1959
- Species Navicula bolleana (Grunow) Cleve accepted as Rhoikoneis bolleana Grunow, 1863
- Species Navicula bombiformis Leuduger-Fortmorel, 1892
- Species Navicula bomboides A.W.F.Schmidt, 1874
- Species Navicula bombus (Ehrenberg) Kützing, 1849 accepted as Diploneis bombus (Ehrenberg) Ehrenberg, 1853
- Species Navicula bombus Donkin, 1872
- Species Navicula bongrainii M. Peragallo, 1921
- Species Navicula bonnieri Lauby, 1910
- Species Navicula borbassii Pantocsek, 1902
- Species Navicula borealis (Ehrenberg) Kützing, 1844 accepted as Pinnularia borealis Ehrenberg, 1843
- Species Navicula borgesenii Østrup, 1913
- Species Navicula borinquensis Hagelstein, 1939
- Species Navicula boris-skvortzowii M.S.Kulikovskiy, D.Metzeltin & H.Lange-Bertalot, 2012
- Species Navicula borneoensis Hustedt, 1966
- Species Navicula borowkae A. Witkowski, H. Lange-Bertalot & D. Metzeltin, 2000
- Species Navicula borrichii J.B.Petersen, 1915 accepted as Stauroneis borrichii (J.B.Petersen) J.W.G.Lund, 1946
- Species Navicula borscowii Mereschkowsky, 1902
- Species Navicula borussica Cleve in Grunow, 1882
- Species Navicula boryana Pantocsek, 1889
- Species Navicula boseana Skvortzov
- Species Navicula bossvikensis S. Busse & P. Snoeijs, 2002
- Species Navicula bosumtwiensis Foged, 1966
- Species Navicula botteriana Grunow
- Species Navicula bottnica Grunow, 1880
- Species Navicula boudetii M. Peragallo, 1921
- Species Navicula bouhardi Héribaud, 1902
- Species Navicula bouillantensis Metzeltin & Lange-Bertalot, 2007
- Species Navicula bourgi Lauby, 1910
- Species Navicula bourrellyi Manguin ex Kociolek & Reviers, 1996
- Species Navicula bourrellyivera Lange-Bertalot, A.Witkowski & K.Stachura, 1998
- Species Navicula boyei Østrup, 1920
- Species Navicula bozenae Lange-Bertalot, Witkowski & Zgrundo, 2003
- Species Navicula brachium Hustedt, 1944
- Species Navicula brachysira Brébisson ex Rabenhorst, 1853
- Species Navicula bramanorum (Ehrenberg) De Toni, 1891 accepted as Pinnularia bramanorum Ehrenberg, 1854
- Species Navicula branchiata Mann, 1925
- Species Navicula brandeli (Cleve) Hustedt, 1909 accepted as Pinnularia brandelii var. brandelii Cleve, 1891
- Species Navicula brasiliana (Cleve) Cleve, 1894
- Species Navicula brasiliensis Grunow
- Species Navicula brauniana Grunow, 1876
- Species Navicula braunii Grunow, 1880 accepted as Pinnularia brauniana (Grunow) Studnicka, 1888
- Species Navicula brebissonii Kützing, 1844 accepted as Pinnularia acutobrebissonii Kulikovskiy, Lange-Bertalot & Metzeltin, 2010
- Species Navicula brebissonii sensu Lagerstedt, 1873
- Species Navicula brebissonii sensu Schmidt in Schmidt et al., 1876
- Species Navicula brebissonii Grunow in Van Heurck
- Species Navicula breenii Archibald, 1966 accepted as Cavinula breenii (R.E.M. Archibald) De Ridder & J.C. Taylor, 2020
- Species Navicula brehmii Hustedt
- Species Navicula brehmiodes Hustedt, 1952
- Species Navicula brehmioides Hustedt accepted as Adlafia brehmioides (Hustedt) P.Tremarin & T. Ludwig, 2017
- Species Navicula breitenbuchii Lange-Bertalot, 2001
- Species Navicula brekkaensis J.B.Petersen, 1928 accepted as Humidophila brekkaensis (Petersen) Lowe, Kociolek, Johansen, Van de Vijver, Lange-Bertalot & Kopalová, 2014
- Species Navicula brekkaensoides Bock, 1963
- Species Navicula bremensis Hustedt, 1957
- Species Navicula bremeyeri Hustedt, 1939 accepted as Astartiella bremeyeri (Lange-Bertalot) Witkowski & Lange-Bertalot, 1998
- Species Navicula breviata Hustedt, 1966
- Species Navicula brevicostata (Cleve) Fricke, 1902 accepted as Pinnularia brevicostata Cleve, 1891
- Species Navicula brevirostrata Hustedt in Schmidt et al., 1936
- Species Navicula brevis Gregory, 1857 accepted as Caloneis brevis (Gregory) Cleve, 1894
- Species Navicula brevis Cleve-Euler, 1932
- Species Navicula brevissima Hustedt, 1937
- Species Navicula brevistriata (van Heurck) Frenguelli, 1926 accepted as Navicula gibba var. brevistriata van Heurck, 1885
- Species Navicula brevistriata Tempère & Peragallo, 1889-1895
- Species Navicula britannica Hustedt & Aleem, 1951
- Species Navicula brockmanni
- Species Navicula brockmannii Hustedt, 1934 accepted as Adlafia brockmannii (Hustedt) Bruder & Hinz, 2008
- Species Navicula broetzii Lange-Bertalot & E.Reichardt, 1996
- Species Navicula brokenshirei R.F.Bastow, 1954
- Species Navicula bronislaae I.Kaczmarska, 1976 †
- Species Navicula bruchii Grunow in Cleve, 1881
- Species Navicula brunelii Poulin, Hudon & Cardinal, 1982
- Species Navicula brunii Pantocsek, 1886
- Species Navicula brunii Cleve-Euler, 1939
- Species Navicula brunii Brun, 1891
- Species Navicula bruyanti Lauby, 1910
- Species Navicula brygidae Lange-Bertalot, A.Witkowski & J.P.Kociolek, 2009
- Species Navicula bryophila J.B.Petersen, 1928 accepted as Adlafia bryophila (J.B.Petersen) Gerd Moser, Lange-Bertalot & D.Metzeltin, 1998
- Species Navicula bryophila Østrup
- Species Navicula bryophiloides Manguin, 1962
- Species Navicula buccella M.H.Hohn & Hellerman, 1963
- Species Navicula buchansiana Woodhead & Tweed, 1960
- Species Navicula budayana Pantocsek, 1892
- Species Navicula budda Skvortzow, 1935
- Species Navicula budensis Grunow in Van Heurck, 1880
- Species Navicula buderi Hustedt, 1954
- Species Navicula buderiformis H.P. Gandhi, 1998 accepted as Navicula buderiformis H.P.Gandhi ex Karthick, 2020
- Species Navicula buderiformis H.P.Gandhi ex Karthick, 2020
- Species Navicula bulgariarum H. Lange-Bertalot & D. Metzeltin, 2006
- Species Navicula bullata Norman in Ralfs in Pritchard, 1861
- Species Navicula bulloides K.E. Lohman, 1957
- Species Navicula bulnheimii Grunow, 1880 accepted as Proschkinia bulnheimii (Grunow) Karayeva, 1978
- Species Navicula burcki Reinhold, 1937
- Species Navicula bushmanorum Cholnoky, 1957
- Species Navicula butreensis Foged, 1966
- Species Navicula caddoensis Bond, 1968 †
- Species Navicula cadeei B.Van de Vijver & C.Cocquyt, 2009
- Species Navicula cadoi Z.Levkov & S.Krstic, 2007
- Species Navicula caduca Hustedt, 1942
- Species Navicula caeca Mann, 1925
- Species Navicula caenosus J.R.Carter & Bailey-Watts, 1981
- Species Navicula caerulea O'Meara, 1875
- Species Navicula caffra (Ehrenberg) De Toni, 1891 accepted as Pinnularia caffra Ehrenberg, 1854
- Species Navicula calcuttensis Skvortzov
- Species Navicula caldwellii Bastow, 1960
- Species Navicula calida Hendey, 1964
- Species Navicula californica Greville, 1859 accepted as Lyrella californica (Greville) D.G.Mann, 1990
- Species Navicula calignosa Cleve & Grove, 1891
- Species Navicula calva Østrup, 1913
- Species Navicula calvata Manguin, 1964
- Species Navicula camerata Cholnoky, 1966
- Species Navicula campanile Cholnoky, 1961
- Species Navicula campbellii Petit, 1877
- Species Navicula campbellii M.Peragallo, 1908
- Species Navicula camplanata (Grunow) Cleve, 1883
- Species Navicula camprocarpa Kützing
- Species Navicula campylodiscus Grunow
- Species Navicula campylogramma Ehrenberg, 1853
- Species Navicula canaliculata Cleve, 1900
- Species Navicula canali-kharicutensis Guiry & Karthick, 2020
- Species Navicula canalis R.M.Patrick, 1944
- Species Navicula canariana Lange-Bertalot, 1993
- Species Navicula cancellata Donkin, 1872
- Species Navicula candida Schumann, 1867
- Species Navicula canoris M.H.Hohn & Hellerman, 1963
- Species Navicula cantonatii Lange-Bertalot, 2001
- Species Navicula cantonensis Ehrenberg, 1847
- Species Navicula capensis M. Peragallo, 1921
- Species Navicula capensis (Ehrenberg) De Toni, 1891 accepted as Pinnularia capensis Ehrenberg, 1854
- Species Navicula capillata Giffen, 1980
- Species Navicula capitata Ehrenberg, 1838 accepted as Hippodonta capitata (Ehrenberg) Lange-Bertalot, Metzeltin & Witkowski, 1996
- Species Navicula capitata Fontell, 1917
- Species Navicula capitata Cleve, 1898
- Species Navicula capitatoradiata Germain, 1981
- Species Navicula capitellata Skvortzow, 1935
- Species Navicula capitellata Cleve-Euler, 1943
- Species Navicula capitive Turpin, 1827
- Species Navicula capitulata Frenguelli, 1925
- Species Navicula capsa Hohn, 1961
- Species Navicula capsula Cleve-Euler, 1949
- Species Navicula caractacus M.H.Hohn & Hellerman, 1963
- Species Navicula carassius Ehrenberg, 1843
- Species Navicula carassius sensu Grunow, 1860
- Species Navicula carbonum (Ehrenberg) De Toni, 1891 accepted as Pinnularia carbonum Ehrenberg, 1846
- Species Navicula cardiella Luchini, 1976
- Species Navicula cardinaliculus (Cleve) Mann
- Species Navicula cardinalis Ehrenberg, 1841 †
- Species Navicula carecti Cholnoky, 1960
- Species Navicula cari Ehrenberg, 1836
- Species Navicula cari sensu Foged, 1958
- Species Navicula cariana Jousé, 1939
- Species Navicula caribaea Cleve in A. Schmidt et al., 1874 accepted as Lyrella clavata var. caribea (Cleve) Siqueiros Beltrones in Siqueiros Beltrones et al., 2020
- Species Navicula caribaea Schmidt, 1874
- Species Navicula carinata Ehrenberg, 1840
- Species Navicula carinata (Schumann) Cleve-Euler in Backman & Cleve-Euler, 1922 accepted as Schizonema carinatum Schumann, 1869
- Species Navicula carinifera Grunow, 1874
- Species Navicula cariocincta Lange-Bertalot apud Tsarenko, Lange-Bertalot, Stupina & Wasser, 2000
- Species Navicula carlae A.Witkowski, Lange-Bertalot & J.P.Kociolek, 2009
- Species Navicula carloffii Foged, 1966
- Species Navicula carminata Hustedt, 1934
- Species Navicula carniolensis Hustedt, 1945
- Species Navicula carolinensis Ehrenberg, 1856
- Species Navicula caroliniae Bahls, 2012
- Species Navicula caroliniana Patrick, 1959
- Species Navicula carpathorum Pantocsek
- Species Navicula carstensenii Foged, 1966
- Species Navicula carteri Van Landingham, 1975
- Species Navicula carvajaliana Patrick
- Species Navicula cascadensis Sovereign, 1958 accepted as Geissleria cascadensis Stancheva & S.A.Spaulding
- Species Navicula casei Cholnoky, 1954
- Species Navicula casertana De Notaris in De Notaris & Baglietto, 1872
- Species Navicula cassa W. Smith, 1859
- Species Navicula cassieana Foged, 1979
- Species Navicula castracanei Grunow in Cleve, 1881
- Species Navicula catalanogermanica Lange-Bertalot & G.Hofmann, 1993
- Species Navicula cataracta-rheni Lange-Bertalot, 1993
- Species Navicula cataractrarum Hustedt, 1955
- Species Navicula catarinensis Krasske, 1948
- Species Navicula caterva Hohn & Hellermann, 1963
- Species Navicula catharinae Ehrenberg, 1854
- Species Navicula catherinae (Ehrenberg) De Toni, 1891 accepted as Pinnularia catherinae Ehrenberg, 1854
- Species Navicula caucasica Ross, 1963
- Species Navicula caudata Metzeltin, Kulikovskiy & Lange-Bertalot, 2012
- Species Navicula caupulus Hohn, 1966
- Species Navicula cavernae Cholnoky, 1957
- Species Navicula ceciliae Van de Vijver, Jarlman & Lange-Bert., 2010
- Species Navicula cefarellii Vouilloud & Guerrero, 2021
- Species Navicula celinei Witkowski, Metzeltin & Lange-Bertalot in Metzeltin & Witkowski, 1996
- Species Navicula cellesensis Héribaud & M. Peragallo in Héribaud, 1902
- Species Navicula cendronii Manguin, 1960
- Species Navicula centrafricana Fusey, 1964
- Species Navicula centraster Cleve, 1895
- Species Navicula centropunctata Hustedt, 1966
- Species Navicula ceratogramma Ehrenberg, 1843
- Species Navicula ceratostigma Ehrenberg, 1841
- Species Navicula cerenutia Hohn, 1961
- Species Navicula ceres Schumann, 1867
- Species Navicula cerevisia Laslandes & Kociolek in Kociolek et al., 2014
- Species Navicula cerneutia Hohn, 1961
- Species Navicula certa Hustedt, 1945
- Species Navicula certa Meister, 1934 (1935)
- Species Navicula cesatii Rabenhorst, 1853 accepted as Encyonopsis cesatii (Rabenhorst) Krammer, 1997
- Species Navicula ceylanensis Leuduger-Fortmorel, 1879
- Species Navicula ceylanica Skvortzow, 1932
- Species Navicula ceylonica Skvortzow, 1930
- Species Navicula chaberti Héribaud, 1903
- Species Navicula chadwickii Foged, 1966
- Species Navicula challengeri Grunow, 1880
- Species Navicula chandolensis H.P.Gandhi, 1964
- Species Navicula chansiensis Skvortzow, 1935
- Species Navicula charcotii M.Peragallo accepted as Luticola charcotii (M. Peragallo) D. Metzeltin & H. Lange-Bertalot in D. Metzeltin, H. Lange-Bertalot & F. García-Rodríguez, 2005
- Species Navicula charlatii M.Peragallo, 1921 accepted as Luticola charlatii (M. Peragallo) D. Metzeltin & H. Lange-Bertalot in D. Metzeltin, H. Lange-Bertalot & F. García-Rodríguez, 2005
- Species Navicula charlattii
- Species Navicula charlottae Foged, 1951
- Species Navicula charontis Ehrenberg, 1854
- Species Navicula chasei Cholnoky, 1954
- Species Navicula chasmaensis Foged, 1959
- Species Navicula chasmigera Cholnoky, 1960
- Species Navicula chaspula Carter & Denny, 1982
- Species Navicula chassagnei Héribaud in Héribaud et al., 1920
- Species Navicula chauhanii H.P. Gandhi, 1998 accepted as Navicula chauhanii H.P.Gandhi ex Karthick, 2020
- Species Navicula chauhanii H.P.Gandhi ex Karthick, 2020
- Species Navicula cheldonensis R.F.Bastow, 1957
- Species Navicula chersonensis Grunow, 1876 accepted as Diploneis chersonensis (Grunow) Cleve, 1894
- Species Navicula chersonensis Meunier, 1910
- Species Navicula cherubim Ross, 1972
- Species Navicula chi Cleve, 1895
- Species Navicula chiarae Lange-Bertalot & S.I.Genkal, 1999
- Species Navicula chilena Lange-Bertalot, 1996
- Species Navicula chiliensis (Ehrenberg) Kützing, 1844 accepted as Pinnularia chilensis Ehrenberg, 1843
- Species Navicula chimmoana O'Meara, 1872
- Species Navicula chinensis Skvortzow, 1929
- Species Navicula chingmaiensis Foged, 1972
- Species Navicula chloridorum Cholnoky, 1968
- Species Navicula cholnokyana Foged, 1975
- Species Navicula cholnokyii H.P.Gandhi, 1964
- Species Navicula cholonokyana Foged, 1975
- Species Navicula chordata Archibald, 1966
- Species Navicula chrissiana Cholnoky, 1965
- Species Navicula chutteri Cholnoky, 1965
- Species Navicula chyzerii Pantocsek, 1889
- Species Navicula ciliata Corda, 1835
- Species Navicula cimex Cholnoky, 1963
- Species Navicula cincta (Ehrenberg) Ralfs, 1861
- Species Navicula cincta Tarnavschi, 1930
- Species Navicula cincta Pantocsek, 1889
- Species Navicula cincta magna J. Brun, 1901
- Species Navicula cinctaeformis Hustedt in Schmidt et al., 1936
- Species Navicula cingens Skvortzov, 1937
- Species Navicula cingulata Hustedt in Schmidt et al., 1936
- Species Navicula cingulatoides Cholnoky, 1963
- Species Navicula cinna M.H.Hohn & Hellerman, 1963
- Species Navicula cipollae Zanon, 1933
- Species Navicula circumcincta Grunow in Cleve & Möller, 1879
- Species Navicula circumnodosa Brun, 1891
- Species Navicula circumsecta (Grunow) Grunow, 1880 accepted as Navicula polysticta var. circumsecta Grunow ex A.Schmidt, 1874
- Species Navicula circumsuta Proschkina-Lavrenko, 1932
- Species Navicula circumtexta F.Meister ex Hustedt, 1934
- Species Navicula circumvallata (Cleve) Cleve accepted as Cymatoneis circumvallata Cleve, 1894
- Species Navicula cistella Greville, 1863
- Species Navicula citrea Schmidt in Schmidt et al., 1877
- Species Navicula citriformis E.G.Lupikina, 1965 †
- Species Navicula citriformis Cleve-Euler, 1953
- Species Navicula citroides K.E. Lohman, 1957
- Species Navicula citrus Krasske, 1923
- Species Navicula citrus Cleve-Euler, 1939
- Species Navicula citrus Cleve-Euler, 1939
- Species Navicula clagesii Gerd Moser
- Species Navicula clamans Hustedt, 1939 accepted as Chamaepinnularia clamans (Hustedt) Witkowski, Lange-Bertalot & D.Metzeltin, 2000
- Species Navicula clancula A.Schmidt, 1875
- Species Navicula clarensiana Schoeman, 1970
- Species Navicula claromontensis Héribaud in Héribaud et al., 1920
- Species Navicula clathrata Østrup, 1895
- Species Navicula clausa T.Marsson, 1900
- Species Navicula clausii Grunow ex Kolkwitz & Marsson, 1908
- Species Navicula clavata Gregory, 1856 accepted as Lyrella clavata (Gregory) D.G.Mann, 1990
- Species Navicula clavata Manguin, 1964
- Species Navicula claviculus Gregory, 1857 accepted as Pinnularia claviculus (Gregory) Rabenhorst, 1864
- Species Navicula claviculus Arnott ex Grunow in Van Heurck, 1880
- Species Navicula clavigera (Cleve) M. Peragallo, 1903 accepted as Caloneis clavigera Cleve, 1894
- Species Navicula claytonii J.R.Carter, 1987
- Species Navicula clementioides Hustedt, 1944
- Species Navicula clementis Grunow, 1882 accepted as Placoneis clementis (Grunow) E.J.Cox, 1987
- Species Navicula clepsydra Meunier, 1910
- Species Navicula clepsydra sensu Schmidt in Schmidt et al., 1876
- Species Navicula clericii Frenguelli, 1923 accepted as Pinnularia Clericii (Frenguelli) Mills, 1934
- Species Navicula clevei Lagerstedt, 1873
- Species Navicula cleviana O'Meara, 1876
- Species Navicula climacospheniae Booth, 1986
- Species Navicula clipeiformis D.König, 1959
- Species Navicula cloacina Lange-Bertalot & Bonik, 1976
- Species Navicula cluthensis Gregory, 1854
- Species Navicula cluthensoides Hustedt, 1966
- Species Navicula clypeus Ehrenberg, 1840
- Species Navicula coarctata Schmidt in Schmidt et al., 1875
- Species Navicula coarctata Ehrenberg, 1842
- Species Navicula coccinella Metzeltin, Lange-Bertalot & García-Rodríguez
- Species Navicula cocconeiformis Gregory ex Greville, 1855 accepted as Cavinula cocconeiformis (Gregory ex Greville) D.G.Mann & A.J.Stickle, 1990
- Species Navicula cocconeiformis Schumann, 1863
- Species Navicula cocconeis Ehrenberg, 1842
- Species Navicula cocconeoides (Rabenhorst) Ralfs in Pritchard, 1861 accepted as Pinnularia cocconeoides Rabenhorst, 1853
- Species Navicula cocconioides J.R.Carter, 1964
- Species Navicula coccus Schumann, 1863
- Species Navicula cochlearis Eichwald, 1844
- Species Navicula cocooneiformis
- Species Navicula cocquytae Z. Levkov & T. Nakov in Levkov, Krstic, Metzeltin & Nakov, 2007
- Species Navicula cocquytiae Z.Levkov & T.Nakov, 2007
- Species Navicula coei Cholnoky, 1960
- Species Navicula coelata (Arnott Walker) Cleve accepted as Cocconeis coelata Arnott ex Greville, 1862
- Species Navicula coerulea O'Meara, 1876
- Species Navicula coerulescens Marsson, 1900
- Species Navicula coffaeiformis A.W.F.Schmidt, 1874 accepted as Diploneis coffeiformis (Schmidt) Cleve, 1894
- Species Navicula coffeiformis
- Species Navicula cohnii (Hilse) Lange-Bertalot, 1985 accepted as Stauroneis cohnii Hilse, 1860
- Species Navicula colii Héribaud in Héribaud et al., 1920
- Species Navicula collersonii D. Roberts & A. McMinn, 1999
- Species Navicula collisiana O'Meara, 1876
- Species Navicula columbiana Hustedt, 1966
- Species Navicula columnaris Ehrenberg
- Species Navicula comerei Héribaud in Héribaud et al., 1920
- Species Navicula commixta Brebisson in Brebisson & Godey, 1835
- Species Navicula commutabilis Hustedt
- Species Navicula commutata Grunow ex A.Schmidt, 1876
- Species Navicula comoides (Agardh) H.Peragallo
- Species Navicula compacta Greville, 1857
- Species Navicula compar Janisch in Schmidt et al., 1881
- Species Navicula comperei Coste & Ricard, 1982
- Species Navicula complanata (Grunow) Grunow, 1880
- Species Navicula complanata Brun, 1896
- Species Navicula complanata (Ehrenberg) De Toni, 1891 accepted as Pinnularia complanata Ehrenberg, 1875
- Species Navicula complanatoides Hustedt, 1987
- Species Navicula complanatula Hustedt, 1987
- Species Navicula completa Hustedt, 1961
- Species Navicula completaoides Foged, 1971
- Species Navicula compositestriata Jasnitsky
- Species Navicula compressa (Ehrenberg) De Toni, 1891 accepted as Pinnularia compressa Ehrenberg, 1860
- Species Navicula compressicauda Schmidt, 1874
- Species Navicula concamerata Hustedt in Schmidt et al., 1936
- Species Navicula concava Patrick, 1945
- Species Navicula concava Harting, 1852
- Species Navicula concentrica Carter & Bailey-Watts, 1981
- Species Navicula concilians Cleve, 1895 accepted as Lyrella concilians (Cleve) D.G.Mann, 1990
- Species Navicula concinna Hustedt, 1944
- Species Navicula concordia C.Riaux-Gobin & A.Witkowski, 2010
- Species Navicula confecta A.Schmidt, 1875
- Species Navicula confervacea (Kützing) Grunow, 1880 accepted as Diadesmis confervacea Kützing, 1844
- Species Navicula confidens Cholnoky, 1963
- Species Navicula confoederata Pantocsek, 1892
- Species Navicula confusa Manguin, 1949
- Species Navicula confusa Laslandes & Kociolek in Kociolek et al., 2014
- Species Navicula congerana Hagelstein, 1939
- Species Navicula congolensis Hustedt, 1949
- Species Navicula congrua Janisch in Schmidt et al., 1881
- Species Navicula conjugata Turpin, 1828
- Species Navicula conjuncta Hustedt, 1966
- Species Navicula connectens (Grunow in Pantocsek) Cleve, 1895 accepted as Navicula lyra var. connectens Grunow in Pantocsek, 1886
- Species Navicula conops (Ehrenberg) Kützing, 1844 accepted as Pinnularia conops Ehrenberg, 1843
- Species Navicula consanguinea Cleve, 1895
- Species Navicula conscensa Cholnoky, 1963
- Species Navicula consentanea Hustedt, 1939
- Species Navicula consimilis Schmidt, 1874
- Species Navicula consimilis sensu Peragallo & Peragallo, 1897
- Species Navicula consors Schmidt in Schmidt et al., 1876
- Species Navicula conspersa Ehrenberg, 1854
- Species Navicula conspersa Pantocsek, 1892
- Species Navicula conspicua A.W.F.Schmidt, 1876
- Species Navicula constans Hustedt, 1944 accepted as Placoneis constans (Hustedt) E.J. Cox, 2003
- Species Navicula constantini Skabichevskii, 1952
- Species Navicula constricta Grunow, 1860
- Species Navicula constricta (Ehrenberg) Schütt, 1896
- Species Navicula constricta (Cleve) M. Peragallo, 1903 accepted as Pinnularia constricta Cleve, 1895
- Species Navicula constricta Pero, 1894 accepted as Navicula peroi Gogorev, 2018
- Species Navicula contempta Krasske, 1929
- Species Navicula contendens Mann, 1925
- Species Navicula contenta Grunow, 1885 accepted as Humidophila contenta (Grunow) Lowe, Kociolek, Johansen, Van de Vijver, Lange-Bertalot & Kopalová, 2014
- Species Navicula contentaeformis Manguin, 1962
- Species Navicula contermina Schmidt in Schmidt et al., 1876
- Species Navicula contigua A.W.F.Schmidt
- Species Navicula contorta Kitton Ms., Cleve, 1895
- Species Navicula contortula Sovereign, 1963
- Species Navicula contracta Ehrenberg, 1842
- Species Navicula contracta Grunow in A. Schmidt, 1890
- Species Navicula contraria R.M.Patrick, 1959
- Species Navicula controversa Mann, 1925
- Species Navicula conveniens Hustedt, 1952
- Species Navicula conventus Heiden, 1900
- Species Navicula convergens Patrick, 1959
- Species Navicula convexa W.Smith, 1853
- Species Navicula conveyi Van de Vijver, 2011
- Species Navicula copiosa A.Schmidt, 1888
- Species Navicula coquedensis Donkin, 1869
- Species Navicula coraliana Metzeltin & Lange-Bertalot, 1998
- Species Navicula corbieri Héribaud, 1903
- Species Navicula cordillerae Frenguelli, 1942
- Species Navicula corniculata (Agardh) H. Kobayasi in Kobayasi, et al., 1977 accepted as Micromega corniculatum C.Agardh, 1827
- Species Navicula cornubiensis Hendey, 1973
- Species Navicula corpulenta Mann, 1925
- Species Navicula correpta Schmidt in Schmidt et al., 1890
- Species Navicula corrugata Bourrelly & Manguin, 1954 accepted as Lecohuia corrugata (Germain) Lange-Bertalot & Rumrich, 2000
- Species Navicula cortanensis Krasske, 1948
- Species Navicula cortanensis sensu Cholnoky, 1957
- Species Navicula corticela Manguin ex Kociolek & Reviers, 1996
- Species Navicula corticola Manguin, 1962
- Species Navicula corymbosa (Agardh) Cleve, 1896
- Species Navicula cosmaria Brebisson ex Kutzing, 1849
- Species Navicula costata Kützing, 1844 accepted as Anomoeoneis costata (Kützing) Hustedt, 1959
- Species Navicula costata Corda, 1835
- Species Navicula costata (Ehrenberg) Héribaud, 1893 accepted as Pinnularia costata Ehrenberg, 1843
- Species Navicula costei Héribaud-Joseph
- Species Navicula costulata Grunow, 1880 accepted as Hippodonta costulata (Grunow) Lange-Bertalot, Metzeltin & Witkowski, 1996
- Species Navicula costuloides Skvortzow, 1937
- Species Navicula cotiformis Grunow ex Cleve, 1881
- Species Navicula cotschii Christjuk, 1930
- Species Navicula couperi (Bailey) Ralfs in Pritchard, 1861 accepted as Pinnularia couperi J.W. Bailey, 1851
- Species Navicula crabro (Ehrenberg) Kützing, 1849 accepted as Diploneis crabro (Ehrenberg) Ehrenberg, 1854
- Species Navicula crabro sensu Greville, 1857
- Species Navicula crabro sensu Schmidt in Schmidt et al., 1881
- Species Navicula crabro sensu Donkin, 1871
- Species Navicula crabroniformis Grunow in Schmidt et al., 1875
- Species Navicula crassa Gregory, 1855
- Species Navicula crassinervia Brébisson ex W.Smith, 1853 accepted as Frustulia crassinervia (Brébisson) Lange-Bertalot & Krammer, 1996
- Species Navicula crassirostris Grunow
- Species Navicula crassula Naegeli in Kutzing, 1849
- Species Navicula crassulexigua Reichardt, 1994
- Species Navicula crateri Patrick, 1970
- Species Navicula craticula Ehrenberg, 1840 accepted as Pinnularia craticula Ehrenberg, 1854
- Species Navicula craticularis Frenguelli, 1933
- Species Navicula craticuloides Li & Metzeltin, 2015
- Species Navicula craveni Leuduger-Fortmorel, 1879
- Species Navicula crebra Hustedt, 1964
- Species Navicula creguti Héribaud & M.Peragallo
- Species Navicula cremeri Van de Vijver & Zidarova, 2011
- Species Navicula cremorme Hohn & Hellerman, 1863
- Species Navicula cremorne M.H.Hohn & Hellerman, 1963
- Species Navicula crepitacula Carter & Denny, 1982
- Species Navicula creuzbergensis Krasske, 1927
- Species Navicula creuzburgensis Krasske, 1927
- Species Navicula criophila (Castracane) De Toni, 1891 accepted as Pinnularia criophila Castracane, 1886
- Species Navicula criophila (Castracane) Van Heurck, 1909 accepted as Pinnularia criophila Castracane, 1886
- Species Navicula criophila Manguin, 1957
- Species Navicula criophila Manguin, 1960
- Species Navicula criophiliforma A.Witkowski, C.Riaux-Gobin & G.Daniszewska-Kowalczyk, 2010
- Species Navicula crispa Krasske, 1951 accepted as Adlafia crispa (Krasske) P.Tremarin & T.Ludwig, 2017
- Species Navicula cristata Peragallo, 1921
- Species Navicula cristata Ehrenberg, 1854
- Species Navicula cristata Ehrenberg, 1854
- Species Navicula cristula Guermeur & Manguin, 1961
- Species Navicula cristula Hohn, 1961
- Species Navicula crocodili Cholnoky, 1962
- Species Navicula cronullensis Wood, 1963
- Species Navicula crucialis Frenguelli, 1929
- Species Navicula cruciata Leuduger-Fortmorel, 1879
- Species Navicula cruciata Cleve, 1881
- Species Navicula crucicula (W.Smith) Donkin, 1871 accepted as Parlibellus cruciculus (W.Smith) Witkowski, Lange-Bertalot & Metzeltin, 2000
- Species Navicula cruciculoides C.Brockmann, 1950
- Species Navicula crucifera Grunow, 1876
- Species Navicula crucifera O'Meara, 1876
- Species Navicula crucifix Tempère & Brun in Brun & Tempère, 1889
- Species Navicula cruciformis Donkin, 1861 accepted as Pinnularia cruciformis (Donkin) Cleve, 1895
- Species Navicula crucigera (W.Smith) Cleve, 1894 accepted as Haslea crucigera (W.Smith) Simonsen, 1974
- Species Navicula crucigeriformis Hustedt, 1961
- Species Navicula crucigeroides Hustedt, 1961
- Species Navicula crucigerum Wm Smith Van Heurck, 1896
- Species Navicula crucitina H. Peragallo in Tempère & Peragallo, 1909
- Species Navicula crux Ehrenberg, 1838
- Species Navicula cruxmeridionalis D. Metzeltin, H. Lange-Bertalot & F. García-Rodríguez, 2005
- Species Navicula cryophila Manguin, 1957
- Species Navicula cryophiliforma Witkowski, Riaux-Gobin & Daniszewska-Kowalczyk
- Species Navicula cryptocefalsa Lange-Bertalot, 1993
- Species Navicula cryptocephala Kützing, 1844
- Species Navicula cryptocephala sensu W. Smith, 1853
- Species Navicula cryptocephaloides Hustedt, 1937
- Species Navicula cryptofallax Lange-Bertalot & Hofmann, 1993
- Species Navicula cryptogaster Lowe, 1972
- Species Navicula cryptolyra Brockmann, 1950
- Species Navicula cryptorrhynchus Cholnoky, 1963
- Species Navicula cryptostriata Salah, 1953
- Species Navicula cryptotenella Lange-Bertalot, 1985
- Species Navicula cryptotenelloides Lange-Bertalot, 1993
- Species Navicula crystallina Hustedt, 1961
- Species Navicula csaszkaae Pantocsek, 1903
- Species Navicula cubitus Tempère & Brun in Brun & Tempère, 1889
- Species Navicula cucullus Pantocsek, 1908
- Species Navicula cumbriensis Haworth, 1988
- Species Navicula cummerowii Kalbe, 1973
- Species Navicula cumvibia Hohn & Hellerman, 1966 accepted as Staurophora cumvibia (Hohn & Hellerman) Desianti & Potapova, 2015
- Species Navicula cunctans Schoeman, 1973
- Species Navicula cuneata O'Meara, 1876
- Species Navicula cuneatostriolata Kulikovskiy Lange-Bertalot & Metzeltin, 2012
- Species Navicula cuneicephala D.G.Mann, 1924
- Species Navicula cuneoquadrata Brun ex Tempère & Peragallo, 1912
- Species Navicula cunoniae Cholnoky, 1963
- Species Navicula curiosa Cholnoky, 1965
- Species Navicula curiosa Hustedt, 1955
- Species Navicula curta Hustedt, 1937
- Species Navicula curtestria Pantocsek, 1892
- Species Navicula curtestriata Østrup, 1918
- Species Navicula curtestriata Pantocsek, 1889
- Species Navicula curtisterna Lange-Bertalot, 2001
- Species Navicula curvilineata Mann, 1907
- Species Navicula curvinervia Grunow in Cleve, 1878
- Species Navicula curvipunctata Leuduger-Fortmorel, 1892
- Species Navicula curviraphis Cleve-Euler, 1953
- Species Navicula curvula Ehrenberg, 1838
- Species Navicula curvula sensu Kutzing, 1844
- Species Navicula cuspidata (Kutzing) Kutzing, 1844 accepted as Craticula cuspidata (Kutzing) D.G.Mann, 1990
- Species Navicula cuspidata sensu Schmidt in Schmidt et al., 1897
- Species Navicula cuspidata Otto Müller, 1899
- Species Navicula cuspidata sensu Frenguelli, 1924
- Species Navicula cuspidata sensu Frenguelli, 1924
- Species Navicula cuspis O'Meara, 1876
- Species Navicula cuvella Carter & Denny, 1982
- Species Navicula cyclophora Castracane, 1886
- Species Navicula cyclops Mann, 1925
- Species Navicula cymatopleura West & G.S.West, 1911
- Species Navicula cymbelliformis Cholnoky, 1954
- Species Navicula cymbelloides Jousé, 1952
- Species Navicula cymbelloides Hustedt in Schmidt et al., 1934
- Species Navicula cymbula Donkin, 1869
- Species Navicula cynthia A.Schmidt, 1875 accepted as Diploneis cynthia (A.Schmidt) Cleve, 1894
- Species Navicula cyprinus (Ehrenberg) Kützing
- Species Navicula cyprinus (Schumann) Cleve, 1895 accepted as Pinnularia cyprinus Ehrenberg, 1843
- Species Navicula cyprinus (W. Smith) Boyer, 1916
- Species Navicula czekejazensis Pantocsek, 1889
- Species Navicula dactylus (Ehrenberg) Kützing, 1844 accepted as Pinnularia dactylus Ehrenberg, 1843
- Species Navicula dactylus sensu Tempère & Peragallo, 1911
- Species Navicula daczii Gaponov, 1915
- Species Navicula dahomensis Hustedt, 1910
- Species Navicula dahurica Skvortzov, 1937
- Species Navicula dahurica Skabichevskií
- Species Navicula dailyi Reimer, 1961
- Species Navicula dakariana Guermeur, 1954
- Species Navicula dalmatica Grunow
- Species Navicula damasii Hustedt, 1962
- Species Navicula damongensis Foged, 1966
- Species Navicula danderiana Guermeur, 1954
- Species Navicula danensis Stiles, 1918
- Species Navicula daochengensis W. Zhang, Chudaev & T. Wang in Wang et al., 2020
- Species Navicula dapaliformis Hustedt, 1966
- Species Navicula dapalis Frenguelli, 1941 accepted as Luticola dapalis (Frenguelli) D.G.Mann, 1990
- Species Navicula dapaloides Frenguelli, 1953 accepted as Luticola dapaloides (Frenguelli) Metzeltin & Lange-Bertalot, 1998
- Species Navicula dariana A.W.F.Schmidt, 1876 accepted as
- Species Navicula dartevellei Kufferath, 1957
- Species Navicula darwiniana Seddon & Witkowski, 2011
- Species Navicula davidsoniana O'Meara, 1876
- Species Navicula dealpina Lange-Bertalot, 1993
- Species Navicula debegenica Cholnoky, 1954
- Species Navicula debilis Pantocsek, 1889
- Species Navicula debilissima Grunow, 1884
- Species Navicula debilitata M. Peragallo in Héribaud et al., 1920
- Species Navicula deblockii Héribaud in Héribaud et al., 1920
- Species Navicula debyi Pantocsek
- Species Navicula decens Pantocsek, 1913
- Species Navicula dechambrei Bourrelly & Manguin, 1950
- Species Navicula decipiens O'Meara, 1876
- Species Navicula decipiens Castracane, 1886
- Species Navicula decipiens Meister, 1932
- Species Navicula decipiens Cleve, 1896
- Species Navicula decissa Carter, 1966
- Species Navicula declinata Hustedt, 1966
- Species Navicula declivis Hustedt, 1934
- Species Navicula decloitrei Guermeur, 1954
- Species Navicula decora Grove & Sturt, 1887
- Species Navicula decora (Greville) Østrup, 1904 accepted as Stauroneis decora Greville, 1865
- Species Navicula decora (Ehrenberg) De Toni, 1891 accepted as Pinnularia decora Ehrenberg, 1854
- Species Navicula decorata (Brun) M. Peragallo, 1903 accepted as Neidium decoratum var. decoratum Brun, 1901
- Species Navicula decrescens Cleve-Euler, 1948
- Species Navicula decrescens Héribaud-Joseph, 1903
- Species Navicula decumana Pantocsek, 1892
- Species Navicula decurrens (Ehrenberg) Kützing, 1844 accepted as Pinnularia decurrens Ehrenberg, 1843
- Species Navicula decurrens sensu Grunow in Schmidt et al., 1876
- Species Navicula decurrens Cleve, 1883
- Species Navicula decussata (Ehrenberg) Kützing, 1849 accepted as Pinnularia decussata Ehrenberg, 1845
- Species Navicula decussepunctata Simonsen, 1960
- Species Navicula decussis Østrup, 1910
- Species Navicula deficilis
- Species Navicula definita Grove & Sturt
- Species Navicula defluens Hustedt, 1944
- Species Navicula degenii Pantocsek, 1902
- Species Navicula dehissa Giffen, 1973
- Species Navicula delastriata Hohn & Hellerman, 1966
- Species Navicula delata Schmidt, 1874
- Species Navicula delawarensis Grunow ex Cleve, 1893
- Species Navicula delecta Meister, 1937
- Species Navicula deliberata Hustedt, 1961
- Species Navicula delicata Frenguelli, 1926 † accepted as Pinnularia delicata (Frenguelli) Mills, 1934
- Species Navicula delicatilineolata H.Kobayasi & S.Mayama, 2003
- Species Navicula delicatissima Hustedt in Schmidt et al., 1934
- Species Navicula delicatula Skvortzov, 1937
- Species Navicula delicatula Cleve, 1894 accepted as Climaconeis delicatula (Cleve) E.J.Cox, 1982
- Species Navicula delicatula W. Smith Collection, 1850
- Species Navicula deliginensis O'Meara, 1876
- Species Navicula delognei Van Heurck, 1880
- Species Navicula delpiroui M. Peragallo in Héribaud et al., 1920
- Species Navicula delta Cleve, 1893
- Species Navicula deltaica D.E. Kellogg, M. Stuiver, T.B. Kellogg & G.H. Denton, 1980
- Species Navicula deltoides Hustedt, 1966
- Species Navicula demerara Grunow, 1893
- Species Navicula demerarae Ehrenberg, 1845
- Species Navicula demerarae Cleve, 1894 accepted as Stauroneis demerarae Cleve, 1894
- Species Navicula demeraroides Hustedt, 1966
- Species Navicula demissa Hustedt, 1945
- Species Navicula demta Schmidt in Schmidt et al., 1881
- Species Navicula denizotii Manguin, 1964
- Species Navicula densa Hustedt
- Species Navicula densepunctata Hustedt, 1962
- Species Navicula densepunctata (Cleve-Euler in Backman & Cleve-Euler) Cleve-Euler, 1953 accepted as Navicula tuscula var. densepunctata Cleve-Euler in Backman & Cleve-Euler, 1922
- Species Navicula densestriata Hustedt, 1922 accepted as Achnanthes petersenii Hustedt, 1937
- Species Navicula densilineolata (Lange-Bertalot) Lange-Bertalot, 1993
- Species Navicula densistriata (Schmidt) Hanna & Grant, 1926 accepted as Navicula gemina var. densestriata A.W.F.Schmidt, 1875
- Species Navicula densuensis Foged, 1966
- Species Navicula denticula
- Species Navicula denticulata O'Meara, 1867
- Species Navicula denticuloides Hustedt in Schmidt et al., 1934
- Species Navicula denudata Pantocsek, 1902
- Species Navicula depauxii M. Peragallo, 1921
- Species Navicula depressa Cleve, 1891
- Species Navicula depressa (Kützing) Ehrenberg, 1838 accepted as Frustulia depressa Kützing, 1833
- Species Navicula derasa Grunow, 1880 accepted as Navicula transitans var. derasa (Grunow) Cleve, 1883
- Species Navicula dermochelycola Witkowski, Kociolek & Riaux-Gobin in Riaux-Gobin et al., 2020
- Species Navicula descripta Hustedt, 1943
- Species Navicula deserti Forti, 1928
- Species Navicula destituta Hustedt, 1966
- Species Navicula destitutiodes Hustedt, 1966
- Species Navicula destricta Hustedt, 1942
- Species Navicula detenta Hustedt, 1943
- Species Navicula detersa Grunow in Cleve, 1883 accepted as Navicula kariana var. detersa Grunow, 1884
- Species Navicula detersa Messjatzew, 1922
- Species Navicula detoniana Gutwinski, 1890
- Species Navicula de-toniana Gutwinski, 1892
- Species Navicula dewittiana Kain & Schultze, 1889
- Species Navicula diabolica Geissler & Gerloff, 1963
- Species Navicula diaculus Schumann
- Species Navicula diagonalis Bailey, 1851
- Species Navicula diahotana Maillard, 1978
- Species Navicula diaphana Ehrenberg, 1845
- Species Navicula diaphanea Manguin in Bourrelly & Manguin, 1952
- Species Navicula dibola Hohn, 1961
- Species Navicula dibrinatemniskovae R.Zidarova & B.Van de Vijver, 2011
- Species Navicula dicephala Ehrenberg, 1838
- Species Navicula dicephala sensu H.L. Smith, 1874-1879
- Species Navicula dicephaloides Fusey, 1948
- Species Navicula dicurvata O'Meara, 1872
- Species Navicula didelta (Hustedt) F.W. Mills, 1934 accepted as Neidium didelta Hustedt, 1922
- Species Navicula didyma Ehrenberg, 1840 accepted as Pinnularia didyma Ehrenberg, 1844
- Species Navicula didyma sensu Schmidt in Schmidt et al., 1881
- Species Navicula didyma Schmidt in Schmidt et al., 1881
- Species Navicula didyma sensu Neupauer, 1867
- Species Navicula didyma sensu Lagerstedt, 1876
- Species Navicula didymus Ehrenberg, 1840
- Species Navicula diengensis VanLand., 1975
- Species Navicula differta Pantocsek, 1902
- Species Navicula difficilis Grunow in Van Heurck, 1880 accepted as Humidophila difficilis (Grunow) Van de Vijver, Ector & T.M.Schuster, 2020
- Species Navicula difficillima Hustedt, 1950
- Species Navicula difficillimoides Hustedt, 1957
- Species Navicula diffluens Schmidt in Schmidt et al., 1874
- Species Navicula difformis Eichwald, 1847
- Species Navicula diffusa A.W.F.Schmidt
- Species Navicula diffusa H. Peragallo, 1888
- Species Navicula dificilis Pantocsek, 1892
- Species Navicula digitoconvergens Lange-Bertalot, 1999
- Species Navicula digitoradiata (Gregory) Ralfs, 1861
- Species Navicula digitoradiata sensu Cleve-Euler, 1922
- Species Navicula digitulus Hustedt, 1943
- Species Navicula digitus (Ehrenberg) Ralfs, 1861 accepted as Pinnularia digitus Ehrenberg, 1854
- Species Navicula digna Hustedt, 1957
- Species Navicula digrediens Schmidt in Schmidt et al., 1881
- Species Navicula dilatata Ehrenberg, 1843
- Species Navicula dilatata sensu Schmidt in Schmidt et al., 1877
- Species Navicula dilucida Hustedt, 1939
- Species Navicula diluviana Krasske, 1933 accepted as Cymbellafalsa diluviana (Krasske) Lange-Bertalot & Metzeltin, 2009
- Species Navicula dimidiata A.Mayer, 1919
- Species Navicula dimidiata Dujardin, 1842
- Species Navicula diomphala (Ehrenberg) Ralfs, 1861 accepted as Pinnularia diomphala Ehrenberg, 1843
- Species Navicula diploneiformis Hustedt, 1957
- Species Navicula diploneoides Hustedt, 1936
- Species Navicula diplosticta Grunow in Schmidt et al., 1875
- Species Navicula directa (W.Smith) Ralfs, 1861 accepted as Pinnularia directa var. directa W. Smith, 1853
- Species Navicula dirhynchus Ehrenberg, 1843
- Species Navicula dirhynchus sensu Donkin, 1871
- Species Navicula dirrhombus Schmidt in Schmidt et al., 1875
- Species Navicula discerneda Cleve-Euler, 1932
- Species Navicula discernenda Pantocsek, 1889
- Species Navicula disciformis Peticolas in Vorce, 1889
- Species Navicula disclusa Hustedt, 1964
- Species Navicula discrepans Schmidt in Schmidt et al., 1875
- Species Navicula discreta Hustedt, 1964
- Species Navicula disculus Schumann, 1862
- Species Navicula diserta Hustedt, 1939
- Species Navicula disertoides Cholnoky, 1968
- Species Navicula disjuncta Hustedt, 1930
- Species Navicula disjunctoides Manguin ex Kociolek & Reviers, 1996
- Species Navicula dismutica Hustedt, 1966
- Species Navicula dispar Schumann, 1862
- Species Navicula disparata Hustedt, 1942
- Species Navicula disparilis Hustedt, 1964 accepted as Placoneis disparilis (Hustedt) D.Metzeltin & Lange-Bertalot, 1998
- Species Navicula dispensata Hustedt & Manguin
- Species Navicula dispersa J.R.Carter, 1964
- Species Navicula dispersa Grove & Sturt, 1887
- Species Navicula dispersepunctata Skabichevskii, 1936
- Species Navicula dispersepunctata Hustedt, 1952
- Species Navicula dispersepunctulata Hustedt, 1966
- Species Navicula disphenia (Ehrenberg) Kützing, 1844 accepted as Pinnularia disphenia Ehrenberg, 1843
- Species Navicula disposita Hustedt, 1964
- Species Navicula disputans R.M.Patrick, 1959
- Species Navicula dissimilis W. Smith, 1857
- Species Navicula dissimilis (Rabenhorst) Ralfs in Pritchard, 1861 accepted as Pinnularia dissimilis Rabenhorst, 1853
- Species Navicula dissipata Salah
- Species Navicula dissipata Hustedt, 1944
- Species Navicula dissociata E.Reichardt, 1984
- Species Navicula dissuta Giffen, 1966
- Species Navicula distans (W.Smith) Ralfs, 1861 accepted as Pinnularia distans W.Smith, 1853
- Species Navicula distantepunctata Simonsen, 1974
- Species Navicula distauridium Ehrenberg, 1841
- Species Navicula distenta Schumann
- Species Navicula distenta Schmidt in Schmidt et al., 1874
- Species Navicula disterta Hustedt accepted as Navicula perminuta Grunow, 1880
- Species Navicula disticha Schmidt in Schmidt et al., 1897
- Species Navicula distincta G.S. West, 1907
- Species Navicula distinctapunctulata Gaud, 1974
- Species Navicula distinctastriata Hohn & Hellerman, 1963
- Species Navicula distinctepunctatum (Hustedt) F.W. Mills, 1934 accepted as Neidium distinctepunctatum Hustedt, 1922
- Species Navicula distinguenda (Cleve) M.Peragallo, 1897 † accepted as Pinnularia viridis var. distinguenda Cleve, 1891 †
- Species Navicula distoma Grunow
- Species Navicula dithmarsica König ex Hustedt, 1964
- Species Navicula diuturna Cholnoky, 1962
- Species Navicula diuturnoides Archibald, 1966
- Species Navicula divaricata Hustedt, 1942
- Species Navicula divaricata Manguin in Bourrelly & Manguin, 1952
- Species Navicula divergens A.Schmidt, 1875 accepted as Diploneis divergens (A.Schmidt) Cleve, 1894
- Species Navicula divergens (W.Smith) Grunow, 1860
- Species Navicula divergentissima Grunow, 1879
- Species Navicula diversa Greville, 1863
- Species Navicula diversa (Østrup) M.Peragallo, 1903 accepted as Pinnularia diversa Østrup, 1901
- Species Navicula diversestriata Jasmitsky, 1936
- Species Navicula diversicostata Brun, 1894
- Species Navicula diversipunctata Hustedt, 1944
- Species Navicula diversistriata Hustedt, 1955
- Species Navicula diversistriata sensu Foged, 1962
- Species Navicula diverta Carter, 1966
- Species Navicula dobrinatemniskovae Zidarova & Van de Vijver, 2011
- Species Navicula doczii Pantocsek, 1889
- Species Navicula dodowaensis Foged, 1966
- Species Navicula doehleri Lange-Bertalot, 2001
- Species Navicula doellojuradoi Frenguelli, 1924
- Species Navicula doello-juradoi Frenguelli, 1924 accepted as
- Species Navicula doeringii Frenguelli accepted as Pinnularia doeringii (Frenguelli) Mills, 1934
- Species Navicula doljensis Pantocsek, 1886
- Species Navicula dolomitica W.Bock, 1970
- Species Navicula dolosa Manguin, 1964
- Species Navicula dolosa Giffen, 1984
- Species Navicula domiciliensis E.Reichardt, 2012
- Species Navicula donkinia O'Meara, 1875
- Species Navicula donkinii A.Schmidt, 1874
- Species Navicula donkinii Carruthers in J.E. Gray, 1864
- Species Navicula dorenbergi Reichelt in Heiden in A. Schmidt, 1903
- Species Navicula dorenbergii Reichelt, 1899 (1900)
- Species Navicula dorogostaiskyi Østrup, 1908
- Species Navicula dosseti Azpeitia, 1911
- Species Navicula drouetiana Patrick, 1944
- Species Navicula dubia Ehrenberg, 1843 accepted as Neidium dubium (Ehenberg) Cleve, 1894
- Species Navicula dubia sensu Schmidt in Schmidt et al., 1877
- Species Navicula dubiosa de Wildeman, 1897
- Species Navicula dubitanda Hustedt & Kolbe, 1987 †
- Species Navicula dubitata Héribaud, 1903
- Species Navicula dubravicensis Grunow, 1882
- Species Navicula duerrenbergiana Hustedt, 1934 accepted as Haslea duerrenbergiana (Hustedt) Sterrenburg in Sterrenburg et al., 2015
- Species Navicula dugaensis Foged, 1966
- Species Navicula dulcioides Foged, 1981
- Species Navicula dulcis Patrick, 1959
- Species Navicula dulcis Krasske, 1939
- Species Navicula dulcis Foged, 1971
- Species Navicula dumontiae Baardseth & Taasen, 1973
- Species Navicula dunstonii Salah, 1953
- Species Navicula duomedia Patrick, 1959
- Species Navicula duplex Pantocsek, 1892
- Species Navicula duplex Nygaard, 1956
- Species Navicula duplicata Ehrenberg, 1843
- Species Navicula duplocapitata Hustedt, 1966
- Species Navicula durandii Kitton, 1885 accepted as Lyrella durandii (Kitton) D.G.Mann, 1990
- Species Navicula durandii sensu Mann, 1925
- Species Navicula durrandii Kitton, 1885
- Species Navicula dusenii (Cleve) M. Peragallo, 1903 accepted as Caloneis dusenii Cleve, 1894
- Species Navicula dutoitiana Cholnoky, 1959
- Species Navicula dux (Ehrenberg) Ralfs in Pritchard, 1861 accepted as Pinnularia dux Ehrenberg, 1854
- Species Navicula dvorachekii Ehrlich, 1978
- Species Navicula dystrophica Patrick, 1959
- Species Navicula eastwoodi Hanna & Grant, 1926
- Species Navicula ebor M.H.Hohn & Hellerman, 1963
- Species Navicula eburnea Zanon, 1941
- Species Navicula ectoris Van de Vijver, 2002
- Species Navicula effrenata Krasske, 1949
- Species Navicula egena Schmidt in Schmidt et al., 1890
- Species Navicula egeria Pantocsek, 1892
- Species Navicula egregia Hustedt, 1942 accepted as Fallacia egregia (Hustedt) D.G.Mann, 1990
- Species Navicula egyptiaca Greville, 1866
- Species Navicula ehrenbergii Kützing, 1844
- Species Navicula eichhoriaephila Manguin, 1962
- Species Navicula eichhorniaephila E.Manguin ex Kociolek & Reviers, 1996
- Species Navicula eidrigeana J.R.Carter, 1979
- Species Navicula eidrigiana J.R.Carter, 1979
- Species Navicula ekholmensis Foged, 1964
- Species Navicula elaborata Hustedt in Schmidt et al., 1934
- Species Navicula elaphros M.H.Hohn & Hellerman, 1963
- Species Navicula elata H.P.Gandhi, 1970
- Species Navicula elata Leuduger-Fortmorel, 1879
- Species Navicula electa Hustedt, 1966
- Species Navicula electrolytifuga H. Lange-Bertalot & Rumrich in U. Rumrich, H. Lange-Bertalot & M. Rumrich, 2000
- Species Navicula elegans W.Smith, 1853 accepted as Pinnularia elegans (W.Smith) K.Krammer, 1992
- Species Navicula elegans sensu Grunow, 1860
- Species Navicula elegantissima Meister, 1935
- Species Navicula elegantissima M. Peragallo in Tempère & Peragallo, 1908
- Species Navicula elegantoides Hustedt, 1942 accepted as Pinnunavis elegantoides (Hustedt) Cocquyt & Olodo in Cocquyt et al., 2018
- Species Navicula elegantula Grunow, 1860
- Species Navicula elenkinii Goriatscheva, 1963
- Species Navicula elephantis Cholnoky, 1964
- Species Navicula elesdiana Pantocsek, 1886
- Species Navicula elevata Kobayashi, 1968
- Species Navicula elginensis (W.Gregory) Ralfs, 1861 accepted as Placoneis elginensis (Gregory) E.J.Cox, 1988
- Species Navicula elisabethae Pantocsek, 1909
- Species Navicula elkab Otto Müller, 1900 accepted as Craticula elkab (Otto Müller) Lange-Bertalot, Kusber & Cocquyt, 2007
- Species Navicula ellips Harting, 1852
- Species Navicula ellipsis Smith ex Norman, 1860
- Species Navicula elliptica Kützing, 1844 accepted as Diploneis elliptica (Kützing) Cleve, 1894
- Species Navicula elliptica W.Smith, 1853
- Species Navicula elliptica Ehrenberg, 1844
- Species Navicula elmorei Patrick, 1966
- Species Navicula elongata Poretzky, 1969
- Species Navicula elongata Grunow in Schmidt, 1874
- Species Navicula elongata Ehrenberg, 1856
- Species Navicula elongata Grunow, 1875
- Species Navicula elongatula Pantocsek, 1889
- Species Navicula elpatievskyi Østrup, 1908 accepted as Neidium elpatievskyi (Østrup) Vishnjakov, 2015
- Species Navicula elsae-thum Pantocsek, 1902 accepted as Navicula cuspidata f. heribaudi (Peragallo) Cleve-Euler, 1952
- Species Navicula elsoniana Patrick & Freese, 1861
- Species Navicula emarginata Ehrenberg, 1849
- Species Navicula emendata Hustedt in Schmidt et al., 1934
- Species Navicula endophytica Hasle, 1968
- Species Navicula engelbrechtii Cholnoky, 1955
- Species Navicula englertiae A.Witkowski, Lange-Bertalot & J.P.Kociolek, 2009
- Species Navicula enigmatica Germain, 1980 accepted as Germainiella enigmatica (Germain) Lange-Bertalot & Metzeltin, 2005
- Species Navicula ennediensis Compère, 1970
- Species Navicula entoleia P.Cleve
- Species Navicula entomon Donkin, 1840
- Species Navicula entomon sensu Grunow in Schmidt et al., 1875
- Species Navicula entzii Pantocsek, 1905
- Species Navicula enucleata Hustedt, 1945
- Species Navicula eocaenica Schrader, 1969
- Species Navicula eomenisculus Benson & Kociolek †
- Species Navicula episcopalis (Cleve) Peragallo, 1903 accepted as Pinnularia episcopalis Cleve, 1891
- Species Navicula eponka Hohn, 1961
- Species Navicula epsilon Cleve, 1893
- Species Navicula equiornata Manguin in Bourrelly & Manguin, 1954
- Species Navicula erdmannensis Foged, 1964
- Species Navicula ergadensis (Gregory) Ralfs, 1861
- Species Navicula erifuga Lange-Bertalot, 1985
- Species Navicula ermanii Lupikina, 1984
- Species Navicula erosa Cleve
- Species Navicula erythraea Grunow in Schmidt et al., 1875
- Species Navicula esamangensis Foged, 1966
- Species Navicula escambia (Patrick) D.Metzeltin & Lange-Bertalot, 2007 accepted as Navicula schroeteri var. escambia R.M.Patrick, 1959
- Species Navicula escorialis R.Simonsen, 1959
- Species Navicula esoculus Schumann
- Species Navicula esox (Ehrenberg) Kützing, 1844 accepted as Pinnularia esox f. esox Ehrenberg, 1843
- Species Navicula esox sensu H.L. Smith, 1874-1879
- Species Navicula esox sensu Lewis, 1862
- Species Navicula esromensis Foged, 1968
- Species Navicula essexii M. Peragallo in Tempère & Peragallo, 1913
- Species Navicula eta Cleve, 1893
- Species Navicula eudoxia A.Schmidt, 1887 accepted as Diploneis contigua var. eudoxia (A.Schmidt) Cleve, 1894
- Species Navicula eugenia A.Schmidt, 1874
- Species Navicula eugeniae Cleve, 1881
- Species Navicula eumontana Messikommer, 1948
- Species Navicula eunotiiformis Mereschkowsky, 1902
- Species Navicula europaea Cleve-Euler, 1953
- Species Navicula euryale Ehrenberg, 1854
- Species Navicula eurycephala Rabenhorst, 1853
- Species Navicula eurysoma Ehrenberg, 1838 (1839)
- Species Navicula euthimius Stone in McLaughlin & Stone, 1986
- Species Navicula evanida Hustedt, 1942
- Species Navicula evexa Sovereign, 1963
- Species Navicula evulsa Østrup, 1895
- Species Navicula evulsa Giffen, 1967
- Species Navicula exasperans Kociolek & Reviers, 1996
- Species Navicula excavata Greville, 1866 accepted as Lyrella excavata (Greville) D.G.Mann, 1990
- Species Navicula excavata (Pantocsek) Ross, 1972 accepted as Navicula oswaldii var. hungarica Pantocsek, 1889
- Species Navicula excavata sensu Cleve & Moller, 1878
- Species Navicula excellens Carlson, 1913
- Species Navicula excelsa Krasske, 1925
- Species Navicula excentrica Grunow, 1860
- Species Navicula excepta VanLandingham, 1975
- Species Navicula exemta A.Schmidt
- Species Navicula exemta A. Schmidt, 1874
- Species Navicula exigua Gregory, 1854
- Species Navicula exigua sensu Pantocsek, 1892
- Species Navicula exigua Pantocsek, 1902
- Species Navicula exigua Dujardin, 1842
- Species Navicula exiguiformis Hustedt, 1944 accepted as Witkowskia exiguiformis (Hustedt) Kulikovskiy, Glushchenko, Mironov & Kociolek, 2024
- Species Navicula exiguioides Hustedt, 1955 accepted as Placoneis exiguioides (Hustedt) H. Lange-Bertalot in D. Metzeltin, H. Lange-Bertalot & F. García-Rodríguez, 2005
- Species Navicula exiliformis Reichardt, 1988 accepted as Navigiolum exiliforme (Reichardt) H. Lange-Bertalot in H. Lange-Bertalot, P. Cavacini, N. Tagliaventi & S. Alfinito, 2003
- Species Navicula exilior Østrup, 1918 (1920)
- Species Navicula exilis Grunow, 1880
- Species Navicula exilis Kützing, 1844
- Species Navicula exilis Grunow
- Species Navicula exilissima Grunow, 1880
- Species Navicula exiloides H.Kobayasi & S.Mayama, 2003
- Species Navicula eximia (Grunow) Grunow, 1897
- Species Navicula expansa Hagelstein, 1939 accepted as Navicula zeta Cleve, 1895
- Species Navicula expecta S.L.VanLandingham, 1975 †
- Species Navicula expectilis Pantocsek
- Species Navicula expedita Schmidt in Schmidt et al., 1881
- Species Navicula expeditionis Frenguelli, 1924
- Species Navicula explanata Hustedt, 1948
- Species Navicula expleta A.Schmidt, 1874
- Species Navicula expleta O'Meara, 1876
- Species Navicula explicata Hustedt, 1964
- Species Navicula explicatoides Hustedt, 1964
- Species Navicula explorata Hustedt, 1966
- Species Navicula exsul A.Schmidt, 1874
- Species Navicula extensa Ralfs in Pritchard, 1861
- Species Navicula extenta W. Smith
- Species Navicula eymei Coste & Ricard, 1982
- Species Navicula faba (Ehrenberg) Kützing, 1849 accepted as Diploneis faba Ehrenberg, 1845
- Species Navicula fabiformis A.Witkowski, C.Riaux-Gobin & G.Daniszewska-Kowalczyk, 2010
- Species Navicula faceta Hustedt, 1949
- Species Navicula facilis Krasske, 1949
- Species Navicula falaisensis Grunow in Van Heurck, 1880 accepted as Encyonopsis falaisensis (Grunow) Krammer, 1997
- Species Navicula falaisiensis Grunow, 1880 accepted as Cymbella falaisiensis Grunow in Van Heurck, 1880
- Species Navicula falaisiensis sensu Boye Petersen, 1915
- Species Navicula falax Pantocsek, 1903
- Species Navicula falklandiae Ehrenberg, 1854
- Species Navicula fallax Cleve, 1894
- Species Navicula falsalyra Hendey, 1970
- Species Navicula famelica Castracane, 1889
- Species Navicula famintzinii Mereschkowsky, 1902
- Species Navicula faoensis Pankow & Huq, 1979
- Species Navicula farakulumensis Foged, 1959
- Species Navicula farcimen Østrup, 1904
- Species Navicula farta Hustedt, 1966
- Species Navicula fasciata Lagerstedt, 1873 accepted as Caloneis bacillum (Grunow) Cleve, 1894
- Species Navicula fasciculata (Grunow ex Cleve) Hustedt, 1961 accepted as Navicula scopulorum var. fasciculata Grunow ex Cleve, 1894
- Species Navicula fastuosa Ehrenberg, 1840
- Species Navicula fatigans Zimmermann, 1918
- Species Navicula fauta Hustedt, 1954
- Species Navicula favus Salah, 1953
- Species Navicula fawumangensis Foged, 1966
- Species Navicula febigeri Cleve, 1881
- Species Navicula fenestrella Hustedt, 1955
- Species Navicula fennica Hustedt, 1962 accepted as Nupela fennica (Hustedt) H. Lange-Bertalot in Krammer & Lange-Bertalot, 2004
- Species Navicula fennoscandica Cleve-Euler in Backman & Cleve-Euler, 1922
- Species Navicula fenzlii Grunow, 1863
- Species Navicula ferdinandikoburg Pantocsek, 1912
- Species Navicula fernandae D. Metzeltin, H. Lange-Bertalot & F. García-Rodríguez, 2005
- Species Navicula fernandesii Moura, 1963
- Species Navicula ferrazae Cholnoky, 1968
- Species Navicula festinans Bory, 1824
- Species Navicula festiva Krasske, 1925
- Species Navicula feuerborni Hustedt, 1937
- Species Navicula feuerbornii Hustedt
- Species Navicula filarszkyana Pantocsek & Greguss in Greguss, 1913
- Species Navicula filarszkyi Pantocsek, 1903
- Species Navicula filholi Soubeiran, 1858
- Species Navicula filiformis Pantocsek, 1905
- Species Navicula fimbriata (Grunow) Cleve & Möller, 1878 accepted as Achnanthes fimbriata (Grunow) R.Ross, 1963
- Species Navicula finitima Hustedt, 1949
- Species Navicula finitima Janisch, 1888
- Species Navicula finmarchica (Cleve & Grunow) Cleve, 1895
- Species Navicula finnica (Ehrenberg) F.W.Mills, 1934 accepted as Cocconeis finnica Ehrenberg, 1838
- Species Navicula firma Kützing, 1844 accepted as Neidium iridis (Ehrenberg) Cleve, 1894
- Species Navicula firma Donkin, 1871
- Species Navicula fischeri A.W.F.Schmidt, 1875
- Species Navicula fistula A.Schmidt, 1874
- Species Navicula flabellata Meister, 1932
- Species Navicula flagellifera Hustedt, 1939
- Species Navicula flahaulti Lauby, 1910
- Species Navicula flamma Schmidt in Schmidt et al., 1876
- Species Navicula flammarionensis Van Landingham, 1975
- Species Navicula flammula Schmidt in Schmidt et al., 1876
- Species Navicula flanatica Grunow, 1860
- Species Navicula flanatica Schmidt in Schmidt in Schmidt et al., 1876
- Species Navicula flattii Pantocsek, 1892
- Species Navicula flavasinensis Moghadam, 1969
- Species Navicula flavasinus Moghadam, 1969
- Species Navicula flebilis Cholnoky, 1963
- Species Navicula flexuosa Ehrenberg, 1832
- Species Navicula flexuosa (Cleve) Peragallo, 1903 † accepted as Pinnularia flexuosa Cleve, 1895 †
- Species Navicula florentina Grunow, 1877
- Species Navicula floridana Cleve, 1881
- Species Navicula florinae Møller, 1950
- Species Navicula flotowii Grunow, 1880
- Species Navicula fluens Hustedt
- Species Navicula fluitans Brun
- Species Navicula fluminensis
- Species Navicula fluminisirtysch Tschistjakov, 1959
- Species Navicula fluminitica Camburn, 1978
- Species Navicula fluviae-jenisseyi Skvortzow, 1971
- Species Navicula fluviatilis Hustedt, 1957
- Species Navicula foederata Grunow ex Moller, 1881
- Species Navicula foerarmensis M. Peragallo, 1903
- Species Navicula fogedii Schoeman in Schoeman & Meaton, 1982
- Species Navicula foliola Tempère & Brun in Brun & Tempère, 1889
- Species Navicula folium Ehrenberg, 1840
- Species Navicula follis Ehrenberg, 1838 †
- Species Navicula fontana J.Zelazna-Wieczorek & Lange-Bertalot, 2011
- Species Navicula fontana Żelazna-Wieczorek, Lange-Bertalot, Olszyński & Witkowski, 2020
- Species Navicula fontelli Cleve-Euler, 1934
- Species Navicula fonticola Grunow, 1880
- Species Navicula fontinalis Grunow, 1885 accepted as Caloneis fontinalis (Grunow) Cleve-Euler, 1932
- Species Navicula forcipata Greville, 1859 accepted as Fallacia forcipata (Greville) Stickle & Mann, 1990
- Species Navicula forficula (O'Meara) M. Peragallo, 1903 accepted as Pinnularia forficula O'Meara, 1867
- Species Navicula formenterae Cleve, 1895
- Species Navicula formica Ehrenberg, 1843 accepted as Pinnularia formica (Ehrenberg) R.M.Patrick, 1966 †
- Species Navicula formicata Krasske, 1939
- Species Navicula formicina Grunow in Cleve, 1878
- Species Navicula formosa Gregory, 1856 accepted as Caloneis westii (W.Smith) Hendey, 1964
- Species Navicula fortii Pantocsek, 1908
- Species Navicula fortis (Gregory) Ralfs ex Pritchard, 1861
- Species Navicula fortis sensu Schmidt in Schmidt et al., 1876
- Species Navicula fortunata Leuduger-Fortmorel, 1879
- Species Navicula fossalis Krasske, 1929 accepted as Mayamaea fossalis (Krasske) Lange-Bertalot, 1997
- Species Navicula fossaloides Hustedt, 1957
- Species Navicula fossilioides Manguin ex Kociolek & Reviers, 1996
- Species Navicula fossilis Ehrenberg, 1854
- Species Navicula fossilis (Pantocsek) Cleve-Euler, 1953 accepted as Navicula tenella var. fossilis Pantocsek, 1889
- Species Navicula foveana Peragallo & Peragallo, 1897-1908
- Species Navicula fracta Hustedt, 1987
- Species Navicula fragilarioides Krasske, 1929 accepted as Diadesmis laevissima (Cleve) Mann, 1990
- Species Navicula fragilis (Greville) Heiberg
- Species Navicula fragilis Skvortzow & Meyer, 1928
- Species Navicula franciscae O'Meara, 1876
- Species Navicula franconiana (Reinsch; Rabenhorst) M. Peragallo, 1903
- Species Navicula frasnensis Fusey, 1848
- Species Navicula frater (Cleve) M. Peragallo, 1903 accepted as Caloneis frater Cleve, 1894
- Species Navicula fraudulenta A.Schmidt, 1881
- Species Navicula frauenfeldii (Grunow) Grunow, 1877 accepted as Amphipleura frauenfeldii Grunow, 1863
- Species Navicula freesei Patrick & Freese, 1961
- Species Navicula frenguelli Reinhold, 1937
- Species Navicula frequens Van Heurck, 1909
- Species Navicula frickei Pantocsek, 1902
- Species Navicula frickei Van Heurck, 1909
- Species Navicula friesneri Reimer, 1961
- Species Navicula frigida Grunow, 1880
- Species Navicula frigida Manguin, 1957
- Species Navicula frigida Manguin, 1960
- Species Navicula frigida sensu E. Jorgensen, 1905
- Species Navicula frigidicola D. Metzeltin, H. Lange-Bertalot & S. Nergui, 2009
- Species Navicula frisiae Brockmann, 1914
- Species Navicula friska Carter, 1966
- Species Navicula fritschii J.W.G.Lund, 1946
- Species Navicula fritschii sensu Foged, 1958
- Species Navicula fromenterae Cleve, 1881
- Species Navicula frugalis Hustedt, 1957
- Species Navicula frustuliaeformis Cholnoky, 1960
- Species Navicula frustuloides Patrick, 1936
- Species Navicula frustulum Hustedt, 1945
- Species Navicula fuchsii Pantocsek, 1889
- Species Navicula fucicola Taasen, 1975
- Species Navicula fuegiana Frenguelli, 1924
- Species Navicula fuenzalidae Frenguelli, 1938
- Species Navicula fujianensis Chin & Cheng, 1979
- Species Navicula fukiensis Skvortzow, 1929
- Species Navicula fulva Ehrenberg, 1837 accepted as Pinnularia fulva Ehrenberg, 1854
- Species Navicula fulva Brebisson in Brebisson & Godey, 1835
- Species Navicula fundata Hustedt, 1964 accepted as Lyrella fundata (Hustedt) Siqueiros Beltrones in Siqueiros Beltrones et al., 2020
- Species Navicula funiculata Mann, 1925
- Species Navicula furtiva E.Manguin, 1952
- Species Navicula fusca (Gregory) Ralfs, 1861 accepted as Diploneis fusca (W.Gregory) Cleve, 1894
- Species Navicula fusca Donkin, 1870
- Species Navicula fuscata Schumann, 1867
- Species Navicula fuscus Bory, 1824
- Species Navicula fusidium Ehrenberg, 1843
- Species Navicula fusiformis Ehrenberg, 1830
- Species Navicula fusiformis Grunow, 1877 accepted as Haslea fusiformis (Grunow) Lobban & C.O.Perez in Lobban et al., 2020
- Species Navicula fusiformis sensu Meunier, 1910
- Species Navicula fusioides Grunow, 1880
- Species Navicula fusoides Grunow, 1880
- Species Navicula fusticulus Østrup, 1910
- Species Navicula fustis Østrup, 1918 (1920)
- Species Navicula fusus (O.F. Müller) Bory, 1827
- Species Navicula fusus (Ehrenberg) De Toni, 1891
- Species Navicula futilis Schmidt in Schmidt et al., 1875
- Species Navicula gaillonii Bory de Saint-Vincent, 1824
- Species Navicula gainii M. Peragallo, 1921
- Species Navicula galapagensis
- Species Navicula galapagoensis Seddon & Witkowski, 2011
- Species Navicula galea Brun, 1891
- Species Navicula galikii (Pantocsek) Cleve, 1889
- Species Navicula gálikii Pantocsek, 1889
- Species Navicula gallapagensis Cleve
- Species Navicula gallica (W.Smith) Lagerstedt, 1873
- Species Navicula gallica Manguin, 1943
- Species Navicula galvagensis O'Meara, 1876
- Species Navicula gamma Cleve
- Species Navicula gandhii Meister, 1932
- Species Navicula gandrupi (Petersen) Krasske, 1938
- Species Navicula gandrupi
- Species Navicula garganica (Rabenhorst) Ralfs in Pritchard, 1861 accepted as Pinnularia garganica Rabenhorst, 1853
- Species Navicula garkeana (Grunow) Cleve, 1894
- Species Navicula gasilidei Héribaud in Héribaud et al., 1920
- Species Navicula gastriformis Hustedt in Schmidt et al., 1934 accepted as Witkowskia gastriformis (Hustedt) Kulikovskiy, Glushchenko, Mironov & Kociolek, 2024
- Species Navicula gastroides Harting, 1852
- Species Navicula gastroides Gregory, 1855
- Species Navicula gastrum (Ehrenberg) Kützing, 1844 accepted as Placoneis gastrum (Ehrenberg) Mereschkovsky, 1903
- Species Navicula gastrum sensu Pantocsek, 1902
- Species Navicula gaufinii Moghadam, 1969
- Species Navicula gaufinii Moghadam, 1969
- Species Navicula gaussii (Heiden) Hustedt
- Species Navicula gauthieri Amossé
- Species Navicula gawaniensis Gasse, 1986
- Species Navicula gebhardi Krasske, 1938
- Species Navicula geinitzi Bünte
- Species Navicula geisslerae R. Jahn, 1992
- Species Navicula geitleri Hustedt, 1937
- Species Navicula geitleri Guermeur & Manguin, 1953
- Species Navicula gelida Grunow, 1884
- Species Navicula gelida Cleve, 1883
- Species Navicula gemina A. Schmidt, 1875
- Species Navicula gemina Ehrenberg, 1840
- Species Navicula geminata Turpin, 1828
- Species Navicula gemma Ehrenberg, 1840
- Species Navicula gemmata Greville, 1859
- Species Navicula gemmatula Grunow
- Species Navicula gemmatula Cleve, 1885
- Species Navicula gemmifera R.Simonsen, 1960
- Species Navicula gendrei Héribaud-Joseph
- Species Navicula genestoermeri A.Witkowski, H-Lange-Bertalot & J.P.Kociolek, 2009
- Species Navicula geniculata Germain, 1937
- Species Navicula genifera Schmidt in Schmidt et al., 1874
- Species Navicula genovefae Fusey, 1951
- Species Navicula gentilis Donkin, 1872 accepted as Pinnularia gentilis (Donkin) Cleve, 1891
- Species Navicula genuflexa Kützing, 1844
- Species Navicula genuistriata Hust., 1942 accepted as Navicula genustriata Hustedt, 1942
- Species Navicula genustriata Hustedt, 1942
- Species Navicula gerloffii Schimanski, 1978
- Species Navicula germainii Wallace, 1960
- Species Navicula germanopolonica Witkowski & Lange-Bertalot, 1993
- Species Navicula geronimensis M. Potapova in Potapova, M. & Charles, D.F., 2004
- Species Navicula gianfranchii Zanon, 1929
- Species Navicula gibba Ehrenberg, 1832 accepted as Rhopalodia gibba (Ehrenberg) Otto Müller, 1895
- Species Navicula gibba Ehrenberg, 1830
- Species Navicula gibba (Ehrenberg) Kützing, 1844 accepted as Pinnularia gibba Ehrenberg, 1843
- Species Navicula gibba sensu Donkin, 1872
- Species Navicula gibba sensu Van Heurck, 1885
- Species Navicula gibberula Lagerstedt, 1873 accepted as Muelleria gibbula (Cleve) S.A.Spaulding & E.F.Stoermer, 1997
- Species Navicula gibbosa Hustedt, 1937 accepted as Ninastrelnikovia gibbosa (Hustedt) H.Lange-Bertalot & A.Fuhrmann, 2014
- Species Navicula gibbula Cleve, 1894 accepted as Muelleria gibbula (Cleve) S.A.Spaulding & E.F.Stoermer, 1997
- Species Navicula giebelii Schmidt, 1874
- Species Navicula gieniaflorentina A.Witkowski, Lange-Bertalot, A.Brzeziska & J.P.Kociolek, 2009
- Species Navicula gieskesii Cholnoky, 1963
- Species Navicula giffeniana Foged, 1975
- Species Navicula gigantea Hustedt, 1961
- Species Navicula gigantorum Cholnoky, 1960
- Species Navicula gigas Castracane, 1866
- Species Navicula gigas sensu Tempère & Peragallo, 1911
- Species Navicula gigas sensu Schmidt in Schmidt et al., 1876
- Species Navicula gilva Archibald, 1971
- Species Navicula giovannettiae Guermeur, 1954
- Species Navicula giriodi Lauby, 1910
- Species Navicula girondica Konig, 1959
- Species Navicula glaberrima West & G.S.West, 1911
- Species Navicula glabra Østrup, 1918
- Species Navicula glabrissima Mann, 1925
- Species Navicula glabriuscula Hustedt
- Species Navicula glacialis (Cleve) Cleve, 1883 accepted as Cocconeis glacialis Cleve, 1873
- Species Navicula glacialis (Ehrenberg) De Toni, 1891 accepted as Pinnularia glacialis Ehrenberg, 1872
- Species Navicula glaciei Van Heurck, 1909
- Species Navicula glangeaudi Lauby, 1910
- Species Navicula glans Ehrenberg, 1838
- Species Navicula globiceps (Gregory) Ralfs, 1861 accepted as Pinnularia globiceps W.Gregory, 1856
- Species Navicula globiceps Lagerstedt, 1873
- Species Navicula globiceps W. & G.S. West, 1911
- Species Navicula globiceps Grunow in Cleve & Grunow, 1880
- Species Navicula globifera O'Meara, 1876
- Species Navicula globosa Meister, 1934
- Species Navicula globosaoides Foged, 1970
- Species Navicula globulifera Hustedt, 1927
- Species Navicula globuliferiformis Lange-Bertalot, 1993
- Species Navicula glomus J.R.Carter, 1981
- Species Navicula gloriosa Brun
- Species Navicula gloriosa Cleve-Euler, 1953
- Species Navicula godfroyi M. Peragallo, 1921
- Species Navicula goeppertiana (Bleisch) H.L.Smith, 1876-1888 accepted as Stauroneis goeppertiana Bleisch ex Rabenhorst, 1861
- Species Navicula goersii Bahls, 1983
- Species Navicula goesii Cleve, 1878
- Species Navicula gogorevii Chudaev, Glushchenko, Kulikovskiy & Kociolek in Kulikovskiy et al., 2020
- Species Navicula gololobovae Chudaev, 2016
- Species Navicula gomontiana Héribaud, 1902
- Species Navicula gomphonemacea Grunow in Van Heurck, 1880
- Species Navicula gomphonemacea Østrup in Héribaud et al., 1920
- Species Navicula gomphonemoides Østrup, 1910
- Species Navicula gondwana Lange-Bertalot, 1993
- Species Navicula gongii Metzeltin & Li, 2015
- Species Navicula gonzalvesiana Gandhi, 1955
- Species Navicula gorjanovicii Pantocsek, 1886
- Species Navicula gotlandica
- Species Navicula gottlandica Grunow, 1880
- Species Navicula goulainensis Amossé, 1975
- Species Navicula gourdonii M. Peragallo, 1921
- Species Navicula gouwsii Cholnoky, 1953
- Species Navicula gracilis Ehrenberg, 1832 accepted as Navicula tripunctata (O.F.Müller) Bory de Saint-Vincent, 1822
- Species Navicula gracilis Lauby, 1910 †
- Species Navicula gracillima (Gregory) Ralfs, 1861 accepted as Pinnularia gracillima var. gracillima Gregory, 1856
- Species Navicula graciloides A.Mayer, 1919
- Species Navicula gradata Hustedt in Schmidt et al., 1936
- Species Navicula gradatoides Cholnoky, 1966
- Species Navicula graeffii Grunow ex A.Schmidt, 1875
- Species Navicula gralana Carter & Denny, 1982
- Species Navicula grammatostoma Ehrenberg, 1841 †
- Species Navicula grammitis Bory, 1831
- Species Navicula grammitis Turpin, 1827
- Species Navicula granii (Jørgensen) Gran, 1908 accepted as Stauroneis granii E.Jorgensen, 1905
- Species Navicula granii Pantocsek, 1908
- Species Navicula granoryza Giffen, 1966
- Species Navicula granulata Ehrenberg, 1836
- Species Navicula granulata Bailey, 1854
- Species Navicula granulata Brébisson in Gregory, 1855
- Species Navicula granulata sensu Schmidt in Schmidt et al., 1875
- Species Navicula granulifera Skvortzow, 1937
- Species Navicula granum Schumann, 1867
- Species Navicula granumavenae Schumann, 1867
- Species Navicula grasmueckii Lange-Bertalot, 1993
- Species Navicula grata Pantocsek, 1889
- Species Navicula gratissima Hustedt, 1944
- Species Navicula gravistriata R.M.Patrick, 1959
- Species Navicula gregalis Cholnoky, 1963
- Species Navicula gregaria Donkin, 1861
- Species Navicula gregarioides Cholnoky
- Species Navicula gregoriana O'Meara, 1874
- Species Navicula gregoriana Greville, 1857
- Species Navicula gregorii Ralfs ex Pritchard, 1861
- Species Navicula gregorii O'Meara, 1875
- Species Navicula gretharum Simonsen, 1974
- Species Navicula grevilleana Hendey, 1964
- Species Navicula grevillei (Agardh) Heiberg, 1863
- Species Navicula grevillei Donkin, 1871
- Species Navicula grevilleoides Hustedt, 1962
- Species Navicula griffithii M. Peragallo in Tempère & Peragallo, 1909
- Species Navicula grimmei Krasske, 1930 accepted as Dorofeyukea grimmei (Krasske in Hustedt) Kulikovskiy & Kociolek in Kulikovskiy et al., 2019
- Species Navicula grimmeioides H.P. Gandhi, 1998 accepted as Dorofeyukea grimmeioides (H.P. Gandhi) Ács, Buczkó & Ector
- Species Navicula grimmii Krasske
- Species Navicula grimmioides Cholnoky, 1963
- Species Navicula grippii Simonsen., 1966
- Species Navicula groenlandica Cleve, 1881
- Species Navicula groenlandica (Østrup) M. Peragallo, 1903 accepted as Libellus groenlandica Østrup, 1897
- Species Navicula groschopfi Hustedt, 1939
- Species Navicula groschopfii Hustedt, 1939
- Species Navicula grossepunctata Hustedt, 1944
- Species Navicula grovei Cleve, 1893
- Species Navicula grovei Meister, 1932
- Species Navicula groveoides Hustedt, 1966
- Species Navicula grudeensis Foged, 1970
- Species Navicula gruendleri (Cleve & Grunow) Cleve
- Species Navicula gruendleri Schmidt, 1873
- Species Navicula grundleri
- Species Navicula grundleriana O'Meara, 1876
- Species Navicula grundtvigii Foged, 1966
- Species Navicula grunovii O«Meara accepted as Navicula omearae Gogorev, 2018
- Species Navicula grunowiana De Toni, 1891
- Species Navicula grunowii Rabenhorst
- Species Navicula grunowii O'Meara, 1876
- Species Navicula guadalupensis Manguin in Bourrelly & Manguin, 1952
- Species Navicula guarujana Zimmermann, 1918
- Species Navicula guatemalensis Cleve & Grove, 1894 accepted as Craticula guatemalensis (Cleve & E.Grove) Lange-Bertalot, 2003
- Species Navicula guaynaboensis Hagelstein, 1939
- Species Navicula guayqueriae Frenguelli, 1934
- Species Navicula guetharyana Fusey, 1953
- Species Navicula guihotii Amossé, 1969
- Species Navicula guinardiana Brun in Brun & Tempère, 1889
- Species Navicula gujaratensis Guiry & Karthick, 2020
- Species Navicula guluensis Giffen, 1963
- Species Navicula gurovii Pantocsek, 1892 †
- Species Navicula guttata Grunow, 1880
- Species Navicula guttulifera Rabenhorst, 1853
- Species Navicula gutvinskii Pantocsek, 1892
- Species Navicula gyrinida Mann, 1907
- Species Navicula gysingensis Foged, 1952
- Species Navicula h Karsten, 1899
- Species Navicula habena M.H.Hohn & Hellerman, 1963
- Species Navicula habita Hustedt, 1952 accepted as Witkowskia habita (Hustedt) Kulikovskiy, Glushchenko, Mironov & Kociolek, 2024
- Species Navicula habitata W. Smith, 1859
- Species Navicula hachiroensis H. Kobayasi in Kobayasi et al., 1977
- Species Navicula hagelsteinii Hustedt, 1962
- Species Navicula hahni Petit
- Species Navicula haitiana
- Species Navicula hajosii Pantocsek, 1909
- Species Navicula h-album Cleve, 1894
- Species Navicula halinae A. Witkowski, H. Lange-Bertalot & D. Metzeltin, 2000
- Species Navicula halionata Pantocsek
- Species Navicula halophila (Grunow) Cleve, 1894 accepted as Craticula halophila (Grunow) D.G.Mann, 1990
- Species Navicula halophilioides Hustedt, 1959
- Species Navicula halophiloides Hustedt, 1959
- Species Navicula hambergi Hustedt, 1924
- Species Navicula hambergii Hustedt, 1924 accepted as Placoneis hambergii (Hustedt) K.Bruder, 2007
- Species Navicula hamiltonii A. Witkowski, H. Lange-Bertalot & D. Metzeltin, 2000
- Species Navicula hamulifera Grunow, 1880
- Species Navicula hancockii Schoeman in Schoeman & Meaton, 1982
- Species Navicula hangchowensis Skvortzow, 1937
- Species Navicula hankae Skvortzow, 1929
- Species Navicula hanseatica Lange-Bertalot & Stachura, 1998
- Species Navicula hanseni Möller, 1950
- Species Navicula hanseniana Lee & Reimer, 1984
- Species Navicula hantkenii Pantocsek, 1889
- Species Navicula haradaae Pantocsek, 1892
- Species Navicula harbinensis Skvortzow, 1937
- Species Navicula harderi Hustedt, 1949
- Species Navicula hardmaniana (Cleve) M. Peragallo, 1903 accepted as Caloneis hardmaniana Cleve, 1894
- Species Navicula hariola Cholnoky, 1966
- Species Navicula harmoniae L.L.Bahls, 2014
- Species Navicula harpa Ehrenberg, 1846
- Species Navicula harrisoniana Cholnoky, 1959
- Species Navicula hartii Cholnoky, 1963
- Species Navicula hartleyana (Greville) H.L.Smith accepted as Pinnularia hartleyana Greville, 1865
- Species Navicula hartzii Foged, 1962
- Species Navicula hassiaca Krasske, 1925
- Species Navicula hasta Pantocsek, 1892
- Species Navicula hastaeformis Cholnoky, 1960
- Species Navicula hastata Jurilj, 1954 †
- Species Navicula hastatula Lange-Bertalot & Miho, 2001
- Species Navicula hauckii Cleve, 1881
- Species Navicula haueri Grunow
- Species Navicula hawaiiensis Johansen in Rushforth, Kaczmarska & Johansen, 1984
- Species Navicula haynaldii Pantocsek, 1889
- Species Navicula haytiana Truan y Luard & Witt, 1888
- Species Navicula hazslinsky
- Species Navicula hazslinszkyi Pantocsek, 1889
- Species Navicula hebes Ralfs, 1861 accepted as Caloneis hebes (Ralfs) R.M.Patrick, 1966
- Species Navicula hebetata W. Smith, 1859
- Species Navicula hebridensis Gregory
- Species Navicula hecateia Cholnoky, 1965
- Species Navicula hedini Hustedt, 1922
- Species Navicula heeri Pantocsek
- Species Navicula heerii Pantocsek, 1889
- Species Navicula heidenii (Heiden) Simonsen, 1992
- Species Navicula heilprinensis Foged, 1955
- Species Navicula heimansii van Dam & Kooyman, 1982
- Species Navicula heimansioides Lange-Bertalot, 1993
- Species Navicula heimii Manguin
- Species Navicula helea Frenguelli, 1933
- Species Navicula helensis Schulz, 1926
- Species Navicula helensoides Archibald, 1966
- Species Navicula helmandensis Foged, 1959
- Species Navicula helminae Heiden
- Species Navicula helvetica Brun, 1895 accepted as Navicula gottlandica Grunow, 1880
- Species Navicula hemilyrata Missuna, 1914
- Species Navicula hemiptera Kützing, 1844 accepted as Pinnularia hemiptera (Kützing) Rabenhorst, 1853
- Species Navicula hemiptera sensu Schmidt in Schmidt et al., 1876
- Species Navicula hemiviridula M. Peragallo in Héribaud et al., 1920
- Species Navicula henckeli Skvortzow & Meyer, 1928
- Species Navicula hennedii Janisch, 1862
- Species Navicula hennedyella Hustedt, 1987
- Species Navicula hennedyi W.Smith, 1856
- Species Navicula hennedyi sensu Witt, 1885
- Species Navicula hennedyii
- Species Navicula hennedyoides Hustedt, 1964
- Species Navicula henriquesii Zimmermann, 1917
- Species Navicula herbstiae Metzeltin & Lange-Bertalot, 1998
- Species Navicula heribaudi M.Peragallo
- Species Navicula heroina A.W.F.Schmidt, 1876
- Species Navicula herrmanii Reichelt in Cleve, 1894
- Species Navicula heteroflexa Pantocsek
- Species Navicula hetero-punctata Chin & Cheng, 1979
- Species Navicula heterostauron Germain, 1937
- Species Navicula heterosticha Yartseva, 1960
- Species Navicula heterostriata Fusey, 1948
- Species Navicula heterovalvata R.Simonsen, 2012
- Species Navicula heufleri Grunow, 1860
- Species Navicula heufleriana (Grunow) Cleve, 1894 accepted as Luticola heufleriana (Grunow) D.G.Mann, 1990
- Species Navicula hevesensis Pantocsek, 1889
- Species Navicula heviziana Gallik, 1935
- Species Navicula hexagona Torka, 1933 accepted as Decussiphycus hexagonus (Torka) Guiry & Gandhi, 2019
- Species Navicula hexapla A.W.F.Schmidt, 1877
- Species Navicula hibernica O'Meara, 1875
- Species Navicula hibschii Reichelt collection, 1900
- Species Navicula higleri A.Witkowski & Lange-Bertalot, 2009
- Species Navicula hilarula Pantocsek, 1892
- Species Navicula hilliardii Manguin ex Kociolek & Reviers, 1996
- Species Navicula hilseana (Janisch) Janisch, 1876 accepted as Pinnularia subcapitata W.Gregory, 1856
- Species Navicula hintzii Lange-Bertalot, 1993
- Species Navicula hippocampus Ehrenberg, 1838 accepted as Gyrosigma attenuatum (Kützing) Rabenhorst, 1853
- Species Navicula hippodontafallax Witkowski & Ch.Li in Witkowski et al., 2016
- Species Navicula hippodontaformis A. Witkowski, C. Riaux-Gobin & G. Daniszewska-Kowalczyk, 2010
- Species Navicula hirudo Rabenhorst, 1864
- Species Navicula hitchcockii Ehrenberg, 1843 accepted as Neidium hitchcockii (Ehrenberg) Cleve, 1894
- Species Navicula hochstetteri Grunow, 1863
- Species Navicula hochstetteriana Grunow, 1867
- Species Navicula hodgeana Patrick & Freese, 1961
- Species Navicula hoefleri Cholnoky & Schindler
- Species Navicula hoevsgoelreinhardtii M.B.Edlund & N.Soninkhishing, 2009
- Species Navicula hoffmannii Pantocsek, 1889
- Species Navicula hofmanniae Lange-Bertalot, 1993
- Species Navicula hohnii VanLandingham, 1975
- Species Navicula hollandica Cholnoky, 1963
- Species Navicula hollerupensis Foged, 1962
- Species Navicula holmenii N.Foged, 1955
- Species Navicula holmiensis Cleve, 1881
- Species Navicula holstii Cleve, 1881
- Species Navicula holubyi Pantocsek, 1886
- Species Navicula homburgiana Hustedt, 1966
- Species Navicula honesta Fontell in Man., Cleve-Euler, 1953
- Species Navicula hongkongensis Skvortzov, 1975
- Species Navicula hordeiformis Pantocsek, 1889
- Species Navicula hornigii Pantocsek, 1892
- Species Navicula horstii D. Metzeltin in D. Metzeltin & H. Lange-Bertalot, 2002
- Species Navicula horvathii Grunow, 1860
- Species Navicula hospes Schmidt in Schmidt et al., 1875
- Species Navicula hovassei Manguin, 1954
- Species Navicula howeana Hagelstein, 1939 accepted as Haslea howeana (Hagelstein) Giffen, 1980
- Species Navicula hudsonis Grunow, 1891
- Species Navicula huei
- Species Navicula hugenottarum Cholnoky, 1959
- Species Navicula humboldtiana H. Lange-Bertalot & Rumrich in U. Rumrich, H. Lange-Bertalot & M. Rumrich, 2000
- Species Navicula humerosa Brébisson ex W. Smith, 1856 accepted as Petroneis humerosa (Brébisson ex W.Smith) A.J.Stickle & D.G.Mann, 1990
- Species Navicula humilis Donkin, 1872
- Species Navicula humjibreensis Foged, 1966
- Species Navicula hummii Hustedt, 1955
- Species Navicula hungarica Grunow, 1860 accepted as Hippodonta hungarica (Grunow) Lange-Bertalot, Metzeltin & Witkowski, 1996
- Species Navicula huniensis Foged, 1966
- Species Navicula hustedtiana Simonsen, 1959
- Species Navicula hustedtii Krasske, 1923
- Species Navicula hustedtii sensu Foged, 1958
- Species Navicula hyalina Donkin, 1861 accepted as Diploneis hyalina (Donkin) Cleve, 1894
- Species Navicula hyalina Hajós, 1968
- Species Navicula hyalina (Ehrenberg) Kützing, 1849 accepted as Diploneis hyalina Ehrenberg, 1845
- Species Navicula hyalinula De Toni, 1891
- Species Navicula hyalosira Cleve, 1891
- Species Navicula hyalosirella Hustedt, 1987
- Species Navicula hybrida M. Peragallo & Héribaud in Héribaud, 1893
- Species Navicula hyperborea Grunow, 1860
- Species Navicula hypothetica
- Species Navicula hyrtlii Pantocsek
- Species Navicula iasnitskii Skvortzow & Meyer, 1928
- Species Navicula iberica Azpeitia, 1911
- Species Navicula icostauron (Ehrenberg) O'Meara, 1875 accepted as Pinnularia isostauron (Ehrenberg) Cleve, 1895
- Species Navicula ignobilis Pantocsek, 1889
- Species Navicula ignobilis Krasske, 1938
- Species Navicula ignorata Schimanski, 1978
- Species Navicula ignorata Skvortzov, 2012
- Species Navicula ignota Krasske, 1932
- Species Navicula ikarii
- Species Navicula illicita Manguin ex Kociolek & Reviers, 1996
- Species Navicula illinoensis Ehrenberg, 1854
- Species Navicula illustra Pantocsek
- Species Navicula illustrioides Hustedt, 1964
- Species Navicula illustris Krasske, 1951
- Species Navicula ilopangoensis Hustedt, 1956
- Species Navicula imbecilla Cholnoky, 1959
- Species Navicula imbellis M.H.Hohn & Hellerman, 1963
- Species Navicula imbricata Bock, 1962
- Species Navicula imitans A.Mann, 1925
- Species Navicula impangenica Cholnoky, 1968
- Species Navicula impercepta Hustedt, 1964
- Species Navicula imperfecta Cleve, 1883
- Species Navicula imperialis (Ehrenberg) Kützing, 1849
- Species Navicula impertila Hohn & Hellerman, 1966
- Species Navicula impexa Hustedt, 1961
- Species Navicula implana Hustedt, 1964
- Species Navicula impleta Cleve & Grove, 1891
- Species Navicula importuna Hustedt, 1942
- Species Navicula impressa Grunow in Schmidt et al., 1875
- Species Navicula impressa Lagerstedt in A. Schmidt, 1876
- Species Navicula inaequalis Ehrenberg, 1836 †
- Species Navicula inaequalis Crouan fr. in Schramm & Mazé, 1866
- Species Navicula inaequalis Crouan fr. in Schramm & Mazé, 1865
- Species Navicula inaequilatera Lagerstedt, 1873
- Species Navicula inaequistriata Rattray, 1887 (1888)
- Species Navicula inattingens R.Simonsen, 1959
- Species Navicula inaurata Hendey, 1958
- Species Navicula incarum U.Rumrich & Lange-Bertalot
- Species Navicula incerta Grunow, 1880 accepted as Navicula salinicola Hustedt, 1939
- Species Navicula incerta Ehrenberg, 1837
- Species Navicula incertata Lange-Bertalot, 1985
- Species Navicula incisa O'Meara, 1876
- Species Navicula incisa Meister, 1932
- Species Navicula inclementis Hendey, 1964
- Species Navicula inclinata Hustedt, 1945
- Species Navicula includens Pantocsek, 1892
- Species Navicula incoacta Hustedt, 1987
- Species Navicula incognita Krasske, 1932
- Species Navicula incomitatus M.H.Hohn & Hellerman, 1963
- Species Navicula incomperta Lewis
- Species Navicula incomposita Hagelstein
- Species Navicula incompta Krasske, 1932
- Species Navicula incongruens Hendey, 1977
- Species Navicula inconspicua Gregory, 1857
- Species Navicula inconstans (Mayer) F.W.Mills, 1934 accepted as Pinnularia inconstans A.Mayer, 1916
- Species Navicula incudiformis Grunow in Cleve, 1883
- Species Navicula inculta Pantocsek, 1892
- Species Navicula inculta Manguin, 1964
- Species Navicula incurva
- Species Navicula incurvata Gregory, 1856
- Species Navicula incus Grunow, 1876
- Species Navicula indefinita M. Peragallo in Tempère & Peragallo, 1908
- Species Navicula indemnis M.H.Hohn & Hellerman, 1963
- Species Navicula index Tempère & Brun in Brun & Tempère, 1889
- Species Navicula indianensis Reimer, 1961
- Species Navicula indica Ehrenberg, 1845
- Species Navicula indicatrix VanLandingham, 1975
- Species Navicula indifferens Hustedt, 1942
- Species Navicula indigens Mann, 1925
- Species Navicula indu Skvortzov, 2012
- Species Navicula inducens Cholnoky, 1963
- Species Navicula indulgens Simonsen, 1959
- Species Navicula inelegans Grove & Sturt, 1887
- Species Navicula inexacta A. Mann, 1925
- Species Navicula inexpectans J.R.Carter, 1964
- Species Navicula inexplorata Krasske, 1939 accepted as Witkowskia inexplorata (Krasske) Kulikovskiy, Glushchenko, Mironov & Kociolek, 2024
- Species Navicula inexspectans Carter, 1964
- Species Navicula infaceta Cholnoky, 1959
- Species Navicula infirma Grunow, 1882
- Species Navicula infirma Manguin, 1941
- Species Navicula infirmata Hustedt & Manguin in Rabenhorst, 1962
- Species Navicula infirmitata Giffen, 1975 accepted as Olifantiella infirmitata (Giffen) Witkowski & Snoeijs in Kaleli et al., 2018
- Species Navicula inflasa Rabenhorst, 1859
- Species Navicula inflata Donkin, 1870
- Species Navicula inflata Gandhi, 1970
- Species Navicula inflata Grunow in Cleve & Möller, 1879
- Species Navicula inflatoides H.P. Gandhi, 1998
- Species Navicula inflexa (Gregory) Ralfs, 1861
- Species Navicula informe Grunow
- Species Navicula infossa Laslandes & Kociolek in Kociolek et al., 2014
- Species Navicula infrenis M.H.Hohn & Hellerman, 1963
- Species Navicula ingapirca H. Lange-Bertalot & Rumrich in U. Rumrich, H. Lange-Bertalot & M. Rumrich, 2000
- Species Navicula ingens Mann, 1925
- Species Navicula ingenua Hustedt, 1957
- Species Navicula ingoldii Foged, 1966
- Species Navicula ingrata Krasske, 1938
- Species Navicula ingstadii Foged, 1964
- Species Navicula ingustata Cholnoky, 1962
- Species Navicula inhalata A.Schmidt, 1874 accepted as Lyrella inhalata (A.Schmidt) D.G.Mann, 1990
- Species Navicula iniqua Krasske, 1932
- Species Navicula injusta Simonsen, 1959
- Species Navicula innommata Leuduger-Fortmorel, 1892
- Species Navicula inornata Grunow, 1880
- Species Navicula inpossibilis Cholnoky, 1966
- Species Navicula inpunctata Cholnoky, 1957
- Species Navicula inquisitor Cholnoky, 1968
- Species Navicula inscendens Pantocsek, 1905
- Species Navicula inscriptura Hendey, 1977
- Species Navicula insepta Carter & Denny, 1982
- Species Navicula insequens Hustedt, 1955
- Species Navicula inserata Hustedt, 1955 accepted as Luticola inserata (Hustedt) D.G.Mann, 1990
- Species Navicula inseriata Hajós, 1968
- Species Navicula insignificans Mann, 1925
- Species Navicula insignis Pantocsek, 1889
- Species Navicula insignita Hustedt, 1942
- Species Navicula insociabilis Krasske, 1932 accepted as Fallacia insociabilis (Krasske) D.G.Mann, 1990
- Species Navicula insociabilis sensu Hustedt in Schmidt et al., 1934
- Species Navicula insolata Loseva, 1983
- Species Navicula insolita É.Manguin ex J.P.Kociolek & B.de Reviers, 1996
- Species Navicula insolubilis Cholnoky, 1963
- Species Navicula instabilis A.Schmidt, 1876 accepted as Pinnularia instabilis (A.Schmidt) D.Metzeltin, 1998
- Species Navicula insularis Ehrenberg, 1841
- Species Navicula insularis Cleve-Euler, 1953
- Species Navicula insulsa Metzeltin & Lange-Bertalot, 1998
- Species Navicula insulsa Manguin, 1952
- Species Navicula insuta Manguin, 1960
- Species Navicula intacta Pantocsek, 1902
- Species Navicula integra (W.Smith) Ralfs, 1861 accepted as Prestauroneis integra (W.Smith) K.Bruder, 2008
- Species Navicula integra (Grunow ex Cleve) Fricke, 1902 accepted as Pinnularia integra Grunow ex Cleve, 1895
- Species Navicula intercedens Schmidt in Schmidt et al., 1890
- Species Navicula interglacialis Hustedt, 1944
- Species Navicula interlineata Grove & Sturt, 1886
- Species Navicula intermedia Lagerstedt, 1873 accepted as Pinnularia intermedia (Lagerstedt) Cleve, 1895
- Species Navicula intermedia (Grunow in Schmidt et al.) Mann, 1907
- Species Navicula intermixta Hustedt, 1966
- Species Navicula interposita Lewis, 1865
- Species Navicula interrupta Kützing, 1844 accepted as Diploneis interrupta (Kützing) Cleve, 1894
- Species Navicula interrupta (W.Smith) Schmidt, 1876 accepted as Pinnularia biceps W.Gregory, 1856
- Species Navicula interrupta Marsson, 1900
- Species Navicula interrupta (Hemprich & Ehrenberg) Hemprich & Ehrenberg, 1831 accepted as Bacillaria interrupta Ehrenberg in Hemprich & Ehrenberg, 1828
- Species Navicula interrupta Hustedt & Ehrenberg in Ehrenberg
- Species Navicula interruptestriata Simonsen in Schwabe & Simonsen, 1961
- Species Navicula interversa Peragallo & Peragallo, 1911
- Species Navicula intestinalis Lange-Bertalot & A.Witkowski, 2009
- Species Navicula intractata Hustedt, 1961
- Species Navicula intricata Karajeva, 1963
- Species Navicula inutilis Krasske, 1949
- Species Navicula invenusta Mann, 1907
- Species Navicula inversa Ehrenberg, 1840
- Species Navicula investigata Heiden, 1905
- Species Navicula invicta Hustedt in Schmidt et al., 1936
- Species Navicula invisitata Heiden in Schmidt et al., 1905
- Species Navicula involata Carter & Denny, 1982
- Species Navicula involuta Mayer, 1919
- Species Navicula iota Cleve, 1894
- Species Navicula iranensis Hustedt, 1962
- Species Navicula irata Krasske, 1932
- Species Navicula ireneae Van de Vijver, Jarlman & Lange-Bert., 2010
- Species Navicula iridescens Mann, 1925
- Species Navicula iridis Ehrenberg, 1843 accepted as Neidium iridis (Ehrenberg) Cleve, 1894
- Species Navicula irmengardis Lange-Bertalot, 1996
- Species Navicula irminae A. Witkowski, C. Riaux-Gobin & G. Daniszewska-Kowalczyk, 2010
- Species Navicula irminiae A.Witkowski, C.Riaux-Gobin & G.Daniszewska-Kowalczyk, 2010
- Species Navicula irregularis Pantocsek, 1889
- Species Navicula irregularis Gasse, 1975
- Species Navicula irreversa Cholnoky, 1965
- Species Navicula irritans Cholnoky, 1959
- Species Navicula irritans Simonsen, 1959
- Species Navicula irrorata Greville, 1859 accepted as Lyrella irrorata (Greville) D.G.Mann, 1990
- Species Navicula irrorata sensu Schmidt in Schmidt et al., 1874
- Species Navicula irroratoides Hustedt, 1964 accepted as Lyrella irroratoides (Hustedt) D.G.Mann, 1990
- Species Navicula isabelensiformis Seddon & Witkowski, 2011
- Species Navicula isabelensiminor Seddon & Witkowski, 2011
- Species Navicula isabelensis Seddon & Witkowski, 2011
- Species Navicula isabelensoides Seddon & Witkowski, 2011
- Species Navicula iserentantii Lange-Bertalot & Witkowski, 2000 †
- Species Navicula isertii Foged, 1966
- Species Navicula islandica Østrup, 1918
- Species Navicula islandica Grunow in Cleve & Möller, 1879
- Species Navicula isocephala (Ehrenberg) Kützing, 1844 accepted as Pinnularia isocephala Ehrenberg, 1843
- Species Navicula isolata K.E. Lohman, 1957
- Species Navicula isolita Manguin, 1960
- Species Navicula isostauron (Ehrenberg) Pantocsek, 1902 accepted as Stauroptera isostauron Ehrenberg, 1843
- Species Navicula isostauron Ehrenberg, 1841
- Species Navicula istriana (Grunow in Van Heurck) Pantocsek, 1902 accepted as Navicula minuscula var. istriana Grunow, 1880
- Species Navicula italica (Rabenhorst) De Toni, 1891 accepted as Pinnularia italica Rabenhorst, 1853
- Species Navicula iversenii Foged, 1962
- Species Navicula ivigtutensis Foged, 1953
- Species Navicula izsopallagae Heiden in Schmidt et al., 1905
- Species Navicula jaagi
- Species Navicula jaagii Meister, 1935 accepted as Kobayasiella jaagii (Meister) Lange-Bertalot, 1999
- Species Navicula jacksoni Schrader, 1969
- Species Navicula jacobii Manguin in Bourrelly & Manguin, 1952
- Species Navicula jacotiae Schoeman, 1970
- Species Navicula jacuda Pantocsek, 1902
- Species Navicula jaernefelti Hustedt in Schmidt et al., 1936
- Species Navicula jaernefeltii Hustedt, 1942
- Species Navicula jaernefeltioides Ricard, 1975
- Species Navicula jakhalsensis VanLandingham, 1975
- Species Navicula jakkalsica Cholnoky, 1955
- Species Navicula jakovljevici Hustedt, 1945
- Species Navicula jamaicensis Greville
- Species Navicula jamalinensis Cleve, 1880 accepted as Austariella jamalinensis (Cleve) Witkowski, Lange-Bertalot & Metzeltin, 2000
- Species Navicula janischiana Rabenhorst in Janisch & Rabenhorst, 1862
- Species Navicula janischii Castracane, 1886
- Species Navicula japonica Heiden, 1903
- Species Navicula jarnefelti
- Species Navicula jarrensis
- Species Navicula jasnitskii
- Species Navicula jatobensis Krasske
- Species Navicula javanenesis Leuduger-Fortmorel, 1892
- Species Navicula javanica Grunow, 1867
- Species Navicula jeffreyi Hallegraeff & Burford, 1996
- Species Navicula jejuna A.W.F.Schmidt
- Species Navicula jejunoides Van Heurck
- Species Navicula jelineckiana
- Species Navicula jelineckii Grunow, 1863 accepted as
- Species Navicula jelinekiana Grunow, 1867
- Species Navicula jennerii W.Smith, 1853
- Species Navicula jentzschii Grunow, 1882
- Species Navicula jequitinhonhae Zimmermann, 1919
- Species Navicula jessenii Foged, 1962
- Species Navicula jimboi Pantocsek, 1892
- Species Navicula jkarii Skvortzow, 1929
- Species Navicula jogensis H.P. Gandhi, 1996
- Species Navicula johanrossii Giffen, 1967
- Species Navicula johnsoniana Greville, 1863
- Species Navicula johnsonii (W.Smith) O'Meara, 1876
- Species Navicula jonssoni Østrup, 1918
- Species Navicula jordani Ehrenberg, 1854
- Species Navicula josephi Pantocsek, 1902
- Species Navicula josephinorum Zanon, 1928
- Species Navicula jota
- Species Navicula joubaudii H.Germain, 1982
- Species Navicula joursacensis Héribaud, 1903
- Species Navicula jouseana Skvortzow, 1971
- Species Navicula juanitalinda D. Metzeltin, H. Lange-Bertalot & F. García-Rodríguez, 2005
- Species Navicula jucuda Cleve-Euler, 1948
- Species Navicula jucuda Pantocsek, 1902
- Species Navicula jugata Cleve, 1881
- Species Navicula jugifera Hustedt in Schmidt et al., 1936
- Species Navicula julieni Héribaud & Brun in Héribaud, 1893
- Species Navicula jungii Krasske
- Species Navicula jurassensis Fusey, 1948
- Species Navicula jurgensii Kützing, 1844
- Species Navicula jurilji Hajós, 1968
- Species Navicula justa Hustedt, 1955
- Species Navicula juvenis (Ehrenberg) F.W. Mills, 1934
- Species Navicula kaapensis Cholnoky, 1955
- Species Navicula kaelfvensis Grunow Ms. in Cleve, 1894
- Species Navicula kaikonkiensis Woodhead & Tweed, 1960
- Species Navicula kalganica Skvortzow, 1935
- Species Navicula kamorthensis Grunow, 1863
- Species Navicula kamorthensis Schmidt in Schmidt et al., 1875
- Species Navicula kanemi Iltis, 1971
- Species Navicula kanitzii Pantocsek, 1892
- Species Navicula kantsiensis Giffen, 1967
- Species Navicula kappa Cleve, 1894
- Species Navicula karelia (Cleve) M. Peragallo, 1903
- Species Navicula karelica Cleve-Euler
- Species Navicula kariana Grunow in Cleve & Grunow, 1880
- Species Navicula kariana Meunier, 1910
- Species Navicula karsia Hohn, 1961
- Species Navicula karstenii Pantocsek, 1902
- Species Navicula karyokonites Cleve, 1883
- Species Navicula kawamurae Skvortzow, 1936
- Species Navicula keeleyi Patrick, 1945
- Species Navicula kefvingensis (Ehrenberg) Kützing, 1844
- Species Navicula kefvingensis sensu Pantocsek, 1902
- Species Navicula kelleri Pantocsek, 1889
- Species Navicula kenaiensis McLaughlin & Stone, 1976
- Species Navicula kenaiensis Stone in McLaughlin & Stone, 1986
- Species Navicula kenon Skvortzow, 1938
- Species Navicula kenyae Cholnoky, 1960
- Species Navicula kepesii Grunow, 1884
- Species Navicula kerguelenensis Castracane, 1886
- Species Navicula kerguelensis (Ehrenberg) Ralfs in Pritchard, 1861 accepted as Pinnularia kerguelensis Ehrenberg, 1854
- Species Navicula kerguelensis Heiden
- Species Navicula kernensis Hanna, 1932
- Species Navicula kertschiana Pantocsek, 1902
- Species Navicula khentiiensis D. Metzeltin, H. Lange-Bertalot & S. Nergui, 2009
- Species Navicula kincaidii Sovereign, 1963
- Species Navicula kinkeriana Pantocsek, 1892
- Species Navicula kinkerii Pantocsek, 1889
- Species Navicula kirchenpauerii De Toni, 1891
- Species Navicula kirchneriana Florin, 1970
- Species Navicula kisber M.H.Hohn & Hellerman, 1963
- Species Navicula kittoniana Schmidt in Schmidt et al., 1874
- Species Navicula kittoniana O'Meara, 1875
- Species Navicula kizakensis Skvortzow, 1936
- Species Navicula kjellmanii (Cleve) Cleve
- Species Navicula klavsenii Østrup
- Species Navicula kleerekoperi Patrick, 1944
- Species Navicula knysnensis Cholnoky, 1956
- Species Navicula kochii (Ehrenberg) Kützing, 1849 accepted as Pinnularia kochii Ehrenberg, 1845
- Species Navicula kochii Pantocsek, 1889
- Species Navicula koeiei Foged, 1959
- Species Navicula koenigi Brockmann, 1950
- Species Navicula kohlenbachii H. Lange-Bertalot & Rumrich in U. Rumrich, H. Lange-Bertalot & M. Rumrich, 2000
- Species Navicula kohlmaieri Lange-Bertalot, 1998
- Species Navicula kolbei Meister, 1932
- Species Navicula kolbei Poretzky & Anissimova, 1933
- Species Navicula kolentiensis Woodhead & Tweed, 1960
- Species Navicula kolugoensis Foged, 1966
- Species Navicula komarovii Poretzky, 1940
- Species Navicula kongsfjordensis Stachura et al., 2015
- Species Navicula koniamboensis Manguin ex Kociolek & Reviers, 1996
- Species Navicula konstantini Skabichevskií, 1952
- Species Navicula koreana Skvortzow, 1936
- Species Navicula korzeniewskii A. Witkowski, H. Lange-Bertalot & D. Metzeltin, 2000
- Species Navicula koslowii Pantocsek, 1913
- Species Navicula kossuthii Pantocsek, 1886
- Species Navicula kotschyana Grunow in Cleve & Grunow, 1880
- Species Navicula kotschyi Grunow, 1860 accepted as Dorofeyukea kotschyi (Grunow) Kulikovskiy, Kociolek, Tusset & T.Ludwig in Kulikovskiy et al., 2019
- Species Navicula kovalchookiana Skvortzow, 1937
- Species Navicula kozlowii
- Species Navicula kpongensis Foged, 1966
- Species Navicula kraeuselii Cholnoky, 1954
- Species Navicula krammeriae Lange-Bertalot in Lange-Bertalot & Metzeltin, 1996
- Species Navicula krasskei Hustedt, 1930
- Species Navicula krenneri Z.Levkov, M.B.Edlund & T.Nakov, 2008 †
- Species Navicula kriegeri Krasske, 1943
- Species Navicula krockii Grunow, 1882
- Species Navicula krookii Grunow, 1882 accepted as Navicula krockii Grunow, 1882
- Species Navicula krsticii Z.Levkov, 2007
- Species Navicula kryokonites Cleve
- Species Navicula kryophila Cleve, 1883
- Species Navicula kuelbsii Lange-Bertalot, 1985
- Species Navicula kuetzingiana H.L. Smith, 1878
- Species Navicula kuetzingii Grunow, 1860
- Species Navicula kuntzei Reichelt, 1898
- Species Navicula kuolensis Cleve-Euler, 1934
- Species Navicula kuripanensis Hustedt in Schmidt et al., 1936
- Species Navicula kurzii Grunow in Cleve, 1878
- Species Navicula kuseliana H. Lange-Bertalot & Rumich in U. Rumrich, H. Lange-Bertalot & M. Rumrich, 2000
- Species Navicula kutzingiana H.L.Smith, 1878
- Species Navicula kützingiana Hilse, 1863
- Species Navicula kuusamensis Cleve-Euler, 1939
- Species Navicula kuwaitiana Hendey, 1970
- Species Navicula kwamkuji Hustedt, 1922
- Species Navicula labrobacata Bone & Gosden, 1968
- Species Navicula lacertosa Hustedt, 1955
- Species Navicula laciniosa Schmidt in Schmidt et al., 1875
- Species Navicula lacrimans A.W.F.Schmidt
- Species Navicula lacrymans
- Species Navicula lacuna Patrick & Freese, 1961
- Species Navicula lacunarum Grunow, 1880
- Species Navicula lacunicola Patrick & Freese, 1961
- Species Navicula lacunolaciniata Lange-Bertalot & Bonik, 1976
- Species Navicula lacunosa Simonsen, 1992
- Species Navicula lacus lemani (J. Brun) J. Brun, 1901 accepted as Diploneis lacuslemanii Brun, 1895
- Species Navicula lacusbaicali
- Species Navicula lacus-chandolensis Guiry & Karthick, 2020
- Species Navicula lacuskarluki Manguin, 1960
- Species Navicula lacus-karluki Manguin ex Kociolek & Reviers, 1996
- Species Navicula lacus-lemani (J.Brun) J.Brun
- Species Navicula lacuslemanii
- Species Navicula lacustris W.Gregory, 1856 accepted as Cavinula lacustris (W.Gregory) D.G.Mann & Stickle, 1990
- Species Navicula lacustris (Agardh) Schutt, 1896 accepted as Schizonema lacustre C.Agardh, 1824
- Species Navicula lacustris Grunow, 1860
- Species Navicula lacustris Schmidt, 1874
- Species Navicula lacuum Lange-Bert., Hofmann, Werum & Van de Vijver, 2009
- Species Navicula ladogensis Cleve, 1891
- Species Navicula laeta A.Mayer, 1919
- Species Navicula laeta Ehrenberg, 1841
- Species Navicula laetvittata
- Species Navicula laevimarginata Hustedt, 1966
- Species Navicula laevis Ehrenberg, 1854
- Species Navicula laevis Pantocsek, 1889
- Species Navicula laevis Cleve-Euler, 1922
- Species Navicula laevissima Kützing, 1844 accepted as Sellaphora laevissima (Kützing) D.G.Mann, 1989
- Species Navicula laevissima sensu W. Smith, 1856
- Species Navicula laevissima sensu Donkin, 1871
- Species Navicula lagerheimii Cleve, 1894 accepted as Pinnularia lagerheimii var. lagerheimii A. Cleve, 1895
- Species Navicula lagerheimii sensu Manguin, 1942
- Species Navicula lagerheimii sensu Hustedt, 1921
- Species Navicula lagerstedti
- Species Navicula lagerstedtii Kolbe, 1959 accepted as Muelleria dubitanda (Hustedt & Kolbe) S.A.Spaulding & E.F.Stoermer, 1999 †
- Species Navicula lagerstedtii sensu Kolbe, 1959
- Species Navicula lagerstedtii O'Meara, 1876
- Species Navicula lagerstedtii sensu Motschi, 1907
- Species Navicula lagerstedtii sensu Hustedt in Schmidt et al., 1934
- Species Navicula lagunae Seddon & Witkowski, 2011
- Species Navicula laingii Foged, 1966
- Species Navicula lalia M.H.Hohn & Hellerman, 1963
- Species Navicula lambda Cleve accepted as Navicula lambda var. lambda Cleve, 1894
- Species Navicula lambda (Skvortzov) Ohtsuka in Ohtsuka & Tuji, 2002 accepted as Navicula lambda var. nipponica Skvortzov, 1936
- Species Navicula lambertensis Héribaud, 1903
- Species Navicula lamella Ehrenberg, 1840
- Species Navicula lamii Manguin, 1941
- Species Navicula lampra Schrader, 1969
- Species Navicula lamprocampa Ehrenberg, 1840
- Species Navicula lamprocarpa
- Species Navicula lanceolata Ehrenberg, 1838
- Species Navicula lanceolata sensu W. Smith, 1853
- Species Navicula lanceolata sensu Hassall, 1845
- Species Navicula lancettula Schumann, 1867
- Species Navicula lange-bertalotii E.Reichardt, 1985
- Species Navicula langoraensis Foged, 1966
- Species Navicula lapeyrereana Tempère & M. Peragallo in Tempère & Peragallo, 1908
- Species Navicula lapidicola (Boye Petersen) Cleve-Euler, 1953 accepted as Stauroneis lapidicola Petersen, 1928
- Species Navicula lapidosa Krasske, 1929 accepted as Cavinula lapidosa (Krasske) Lange-Bertalot, 1996
- Species Navicula lapidosa sensu Foged, 1958
- Species Navicula lapila J.R.Carter, 1981
- Species Navicula lapsa Carter & Denny, 1992
- Species Navicula lata (Brébisson) Kützing, 1844 accepted as Frustulia lata Brébisson, 1838
- Species Navicula lata Brébisson ex Kützing, 1846
- Species Navicula lata sensu Van Heurck, 1880
- Species Navicula latefasciata Grunow accepted as Caloneis latefasciata (Grunow) Cleve, 1894
- Species Navicula latelongitudinalis R.M.Patrick, 1959
- Species Navicula latens Krasske ex Hustedt, 1934 †
- Species Navicula lateropunctata J.H.Wallace, 1960
- Species Navicula laterostrata Hustedt, 1925
- Species Navicula latestriata Gregory
- Species Navicula latestriata Petit & Leuduger-Fortmoral
- Species Navicula latevittata Pantocsek, 1892
- Species Navicula latevittata (Cleve) Fricke, 1902 † accepted as Schizonema domingense Kuntze, 1898
- Species Navicula laticeps Hustedt, 1942
- Species Navicula laticeps sensu Cleve-Euler, 1953
- Species Navicula latissima Gregory, 1856 accepted as Petroneis latissima (Gregory) A.J.Stickle & D.G.Mann, 1990
- Species Navicula latissima J.W. Bailey, 1854
- Species Navicula latissima sensu Brockmann, 1928
- Species Navicula latiuscula Kützing, 1844 accepted as Caloneis latiuscula (Kützing) Cleve, 1894
- Species Navicula lauca Rumrich & H. Lange-Bertalot in U. Rumrich, H. Lange-Bertalot & M. Rumrich, 2000
- Species Navicula lauriensis J.Frenguelli & H.A.Orlando, 1958
- Species Navicula lauta Grunow
- Species Navicula lawsonii Foged, 1966
- Species Navicula leboimei Manguin, 1960
- Species Navicula leemanniae Cholnoky, 1854
- Species Navicula lefevrei Manguin in Allorge & Manguin, 1941
- Species Navicula legumen Ehrenberg
- Species Navicula legumen (Ehrenberg) Ehrenberg, 1843 accepted as Pinnularia legumen f. legumen Ehrenberg, 1843
- Species Navicula legumen (Ehrenberg) F.W.Mills, 1934 accepted as Stauroptera legumen Ehrenberg, 1843
- Species Navicula lehmanniae Lange-Bertalot & Steindorf in Moser, Steindorf & Lange-Bertalot, 1995
- Species Navicula leistikowii Lange-Bertalot, 1993
- Species Navicula lemanniae Cholnoky, 1954
- Species Navicula lemkei A.Witkowski, 2009
- Species Navicula lemmermanni Hustedt, 1911
- Species Navicula lengana
- Species Navicula lenis Foged, 1971 accepted as Krsticiella lenis (Foged) M. Potapova
- Species Navicula lenoblei Manguin, 1952
- Species Navicula lenticula Østrup, 1913
- Species Navicula lenzi Krasske, 1939
- Species Navicula lenzii Hustedt, 1936
- Species Navicula leonardii Compère, 1967
- Species Navicula leonis Pantocsek, 1905
- Species Navicula lepida Gregory, 1856
- Species Navicula lepidissima Cleve-Euler, 1953
- Species Navicula lepidosa Khabakov, 1945
- Species Navicula lepidula Grunow, 1880
- Species Navicula lepidula Manguin in Bourrelly & Manguin, 1952 accepted as Sellaphora flammarionensis (VanLandingham) C.E.Wetzel & M.Coste, 2018
- Species Navicula lepta Schrader, 1969
- Species Navicula leptocephala Brébisson, 1880
- Species Navicula leptocephala Rabenhorst, 1853
- Species Navicula leptoceros Ehrenberg, 1854
- Species Navicula leptogongyla Ehrenberg, 1843
- Species Navicula leptogongyla Ehrenberg, 1841 †
- Species Navicula leptolopa Meister, 1937
- Species Navicula leptorhynchus Ehrenberg, 1843
- Species Navicula leptosoma Grunow, 1880
- Species Navicula leptostigma sensu Pantocsek, 1902
- Species Navicula leptostriata Jørgensen, 1948
- Species Navicula leptostylus Ehrenberg, 1842
- Species Navicula leptotermina Ehrenberg, 1844 (1845)
- Species Navicula lesinensis Grunow in Cleve, 1885
- Species Navicula lesinensis Cleve ex Thum, 1889
- Species Navicula lesmonensis Hustedt, 1957
- Species Navicula lesothensis Schoeman, 1969
- Species Navicula letourneurii Pantocsek, 1889
- Species Navicula letulenta Archibald, 1966
- Species Navicula leudugeri Cleve, 1883
- Species Navicula levanderi Hustedt, 1934
- Species Navicula leveillei Héribaud, 1903
- Species Navicula levensis Carruthers in J.E. Gray, 1864
- Species Navicula levis Pantocsek, 1889
- Species Navicula levissima
- Species Navicula leviuscula De Toni, 1891
- Species Navicula lewisiana Greville, 1863
- Species Navicula liaotungiensis Skvortzow, 1929
- Species Navicula libellus Gregory, 1857
- Species Navicula liber W.Smith, 1853 accepted as Caloneis liber (W.Smith) Cleve, 1894
- Species Navicula libonensis Schoeman, 1970
- Species Navicula librile Ehrenberg, 1832
- Species Navicula liburnica Grunow, 1860
- Species Navicula libyca Ehrenberg, 1840
- Species Navicula licenti Skvortzow, 1935
- Species Navicula licuarae (Ehrenberg) De Toni, 1891 accepted as Pinnularia licuarae Ehrenberg, 1854
- Species Navicula ligneri Lauby, 1910
- Species Navicula lignitica (Cleve) M. Peragallo, 1903 accepted as Pinnularia lignitica Cleve, 1895
- Species Navicula limanense Østrup in Héribaud et al., 1920
- Species Navicula limata Hustedt, 1944
- Species Navicula limatoides Hustedt, 1950
- Species Navicula limbata Ehrenberg, 1843
- Species Navicula limicola Cleve, 1893
- Species Navicula limitanea Schmidt in Schmidt et al., 1875
- Species Navicula limnetica Kociolek in Kociolek et al., 2014
- Species Navicula limosa Kützing, 1844 accepted as Caloneis limosa (Kützing) R.M.Patrick, 1966
- Species Navicula limosa sensu Donkin, 1872
- Species Navicula limosa sensu Lagerstedt, 1873
- Species Navicula limosa Rabenhorst, 1853
- Species Navicula limpida Perty, 1852
- Species Navicula lindae Sullivan & Reimer, 1975
- Species Navicula linearicuneata Gleser in Afanas'eva & Gleser, 1986
- Species Navicula linearis Grunow, 1860
- Species Navicula linearis (Gregory) Ralfs in Pritchard, 1861 accepted as Pinnularia linearis Gregory, 1856
- Species Navicula linearis Bory, 1827
- Species Navicula linearis (Otto Müller) Frenguelli, 1924 accepted as Diploneis linearis Otto Müller, 1909
- Species Navicula lineata Donkin, 1858 accepted as Diploneis lineata (Donkin) Cleve, 1894
- Species Navicula lineata Bory, 1824
- Species Navicula lineata Turpin, 1828 (1816-1829)
- Species Navicula lineata Bory, 1827
- Species Navicula lineola Ehrenberg, 1854
- Species Navicula lineola Grunow
- Species Navicula lineolata Ehrenberg, 1843
- Species Navicula lineolata Ehrenberg, 1838
- Species Navicula lineostriata Patrick, 1936
- Species Navicula linter O. Witt, 1873
- Species Navicula liostauron Ehrenberg, 1841
- Species Navicula liouvillei M. Peragallo, 1921
- Species Navicula lirata Ehrenberg
- Species Navicula lithognatha Cholnoky, 1963
- Species Navicula lithognathoides Cholnoky, 1963
- Species Navicula litoralis
- Species Navicula litoricola Hustedt, 1955
- Species Navicula litorina Heiden, 1900
- Species Navicula litoris Salah, 1953
- Species Navicula litos M.H.Hohn & Hellerman, 1963
- Species Navicula littoralioides de Wildeman, 1897
- Species Navicula littoralis Donkin, 1871
- Species Navicula ljungneri Cleve-Euler
- Species Navicula lobata Schwartz in Rabenhorst, 1877
- Species Navicula lobata Grove & Sturt, 1887
- Species Navicula lobata Cleve, 1878
- Species Navicula lobeliae Jørgensen, 1948
- Species Navicula loczyi Pantocsek, 1889
- Species Navicula lohmannii H. Lange-Bertalot & Rumrich in U. Rumrich, H. Lange-Bertalot & M. Rumrich, 2000
- Species Navicula loibl-sittlerii Reichardt, 1988
- Species Navicula lomastriata Hohn, 1966
- Species Navicula londonensis Foged, 1964
- Species Navicula longa (Gregory) Ralfs ex Pritchard, 1861
- Species Navicula longi Reinhold, 1937
- Species Navicula longicephala Hustedt, 1944
- Species Navicula longiceps Gregory, 1856 accepted as
- Species Navicula longifissa Hustedt, 1952
- Species Navicula longirostris Hustedt, 1930
- Species Navicula longistriata Horikawa & Okuno in Okuno, 1940
- Species Navicula lorami Frenguelli, 1936 (1938)
- Species Navicula lorcana Azpeitia, 1911
- Species Navicula lorenziana Grunow, 1860
- Species Navicula lorenzii (Grunow) Hustedt, 1961
- Species Navicula lovenii Foged, 1964
- Species Navicula loveridgei Cholnoky, 1964
- Species Navicula lubbockii Hohn & Hellerman, 1961
- Species Navicula lubetii Konig, 1959
- Species Navicula lucenoides Giffen, 1980
- Species Navicula lucens Hustedt, 1942
- Species Navicula lucentiformis Cholnoky, 1960
- Species Navicula luciae A. Witkowski & H. Lange-Bertalot in H. Lange-Bertalot & S. I. Genkal, 1999
- Species Navicula luciana Cholnoky, 1960
- Species Navicula lucida O'Meara, 1876
- Species Navicula lucida Pantocsek, 1892
- Species Navicula lucidula Grunow, 1880
- Species Navicula lucifica (Kuntze) Pantocsek
- Species Navicula lucinensis Hustedt, 1950
- Species Navicula luculenta A.W.F.Schmidt, 1876
- Species Navicula ludloviana Schmidt, 1876 †
- Species Navicula ludlowiana
- Species Navicula luisii Patrick, 1961
- Species Navicula lumbricastriata Hohn & Hellerman, 1966
- Species Navicula lumen H. Peragallo, 1888
- Species Navicula lunata Kützing, 1844
- Species Navicula lunatapicalis Salah, 1953
- Species Navicula lundii Reichardt, 1985
- Species Navicula lundii Sinha & Srivastava, 1986
- Species Navicula lundstroemii Cleve, 1880 accepted as Cosmioneis lundstroemii (Cleve) D.G.Mann, 1990
- Species Navicula lundstroemii sensu Cholnoky, 1958
- Species Navicula lundstromii
- Species Navicula lundströmii
- Species Navicula lunula Cleve, 1894
- Species Navicula lunulaefera H.P. Gandhi, 1998 accepted as Navicula lunulifera H.P.Gandhi ex Karthick, 2020
- Species Navicula lunulifera H.P.Gandhi ex Karthick, 2020
- Species Navicula lunyacsekii Pantocsek, 1886
- Species Navicula lupula Carter & Denny, 1982
- Species Navicula lurinda Carter & Denny, 1982
- Species Navicula lusitanica Zimmermann, 1917
- Species Navicula lusoria Giffen, 1975
- Species Navicula luxoriensis Foged, 1980
- Species Navicula luxuriosa Greville, 1863 accepted as Diademoides luxuriosa (Greville) K.-D.Kemp & T.B.B.Paddock, 1990 †
- Species Navicula luzonensis Hustedt, 1942
- Species Navicula lychnidis Jurilj, 1954
- Species Navicula lyra Ehrenberg, 1843
- Species Navicula lyra sensu Hanna, 1933
- Species Navicula lyra sensu Brockmann, 1950
- Species Navicula lyra Kitton, 1884
- Species Navicula lyrans Jurilj, 1957
- Species Navicula lyrata Ehrenberg, 1856
- Species Navicula lyrella Hustedt, 1964
- Species Navicula lyrella (Ehrenberg) De Toni, 1891 accepted as Pinnularia lyrella Ehrenberg, 1860
- Species Navicula lyrigera Østrup, 1918
- Species Navicula lyroides Hendey, 1958 accepted as Lyrella lyroides (Hendey) D.G.Mann, 1990
- Species Navicula mabokiana Fusey, 1964
- Species Navicula macdonaghi Frenguelli, 1929
- Species Navicula macer Schoeman, 1973
- Species Navicula maceria Schimanski, 1978
- Species Navicula macilenta Ehrenberg, 1837 †
- Species Navicula macilenta (Ehrenberg) Pantocsek, 1889 accepted as Pinnularia macilenta var. macilenta (Ehrenberg; Ehrenberg) Ehrenberg, 1843
- Species Navicula macra Grunow, 1876
- Species Navicula macraeana Pantocsek, 1889
- Species Navicula macraei Rabenhorst, 1864
- Species Navicula macrocephala Schumann, 1867
- Species Navicula macrogongyla Rabenhorst, 1860
- Species Navicula macromphala Schumann, 1867
- Species Navicula macropunctata Hajós, 1973
- Species Navicula macula Gregory, 1856
- Species Navicula maculata Hustedt
- Species Navicula maculata (Bailey) Edwards, 1859 accepted as Stauroneis maculata Bailey, 1851
- Species Navicula maculifera (Cleve) Tempère & Peragallo, 1889-1895 accepted as Navicula cluthensis var. maculifera Cleve, 1881
- Species Navicula maculosa Donkin, 1871
- Species Navicula maculosa H. Peragallo & M. Peragallo, 1898
- Species Navicula madagascarensis Cleve in Tempère, 1890
- Species Navicula madagascarensis Fritsch, 1914
- Species Navicula madeirensis Lange-Bertalot, 1993
- Species Navicula madrae Hanna & Grant, 1926
- Species Navicula madumensis E.G.Jørgensen, 1948
- Species Navicula maeandriana Cleve, 1893
- Species Navicula maeandrinoides Hustedt in Schmidt et al., 1930
- Species Navicula maeotica Pantocsek, 1902
- Species Navicula magellancia
- Species Navicula magellanica (Cleve) Frenguelli, 1924 accepted as Neidium magellanicum var. magellanicum Cleve, 1900
- Species Navicula maginii M. Peragallo, 1924
- Species Navicula magna Skvortzov
- Species Navicula magnifica Hustedt in Schmidt et al., 1934
- Species Navicula magocsyi
- Species Navicula maharashtrensis Sarode & Kamat, 1984
- Species Navicula mahoodii A. Witkowsi & Witton in A. Witkowski, H. Lange-Bertalot & D. Metzeltin, 2000
- Species Navicula maidanae Metzeltin & Lange-Bertalot, 1998
- Species Navicula maillardii Germain, 1982
- Species Navicula maiorpargemina D. Fernández-Moreno, P. Sánchez-Castillo, C. Delgado & S.F.P. Almeida, 2022
- Species Navicula major (Kützing) Ehrenberg, 1838 accepted as Pinnularia major (Kützing) Rabenhorst, 1853
- Species Navicula major (Kützing) Kützing, 1844 accepted as Frustulia major Kützing, 1833
- Species Navicula major (sensu Dippel) F.W. Mills, 1934
- Species Navicula major sensu W. Smith, 1853
- Species Navicula major sensu Grunow in Schmidt et al., 1876
- Species Navicula major sensu Grunow in Schmidt et al., 1876
- Species Navicula majuscula Hustedt, 1964
- Species Navicula majusculoides Hustedt, 1964
- Species Navicula malacarae Frenguelli, 1945
- Species Navicula maleposita Simonsen, 1992
- Species Navicula maliana Maillard, 1977
- Species Navicula malica Carter & Denny, 1982
- Species Navicula malinvaudi Héribaud, 1902
- Species Navicula malombensis Otto Müller, 1910
- Species Navicula malutiana Schoeman, 1969
- Species Navicula mammalis Castracane, 1886
- Species Navicula manginii M. Peragallo, 1924
- Species Navicula manguini Guermeur, 1954
- Species Navicula manifesta Hustedt, 1939
- Species Navicula manifesta Marsson, 1900
- Species Navicula maniliensis
- Species Navicula mannii Hagelstein, 1939
- Species Navicula manokwariensis Cholnoky, 1963
- Species Navicula mansiensis Foged, 1966
- Species Navicula mantichora Pantocsek, 1892
- Species Navicula manubialis Archibald, 1966
- Species Navicula mardansouensis Héribaud, 1908
- Species Navicula margalithii Lange-Bertalot, 1985
- Species Navicula margarita Schmidt in Schmidt et al., 1892
- Species Navicula margarita Pantocsek, 1905
- Species Navicula margaritacea Hustedt, 1937
- Species Navicula margaritata Pantocsek, 1903
- Species Navicula margaritiana Witkowski, 1994
- Species Navicula margaritifera Truan y Luard & Witt, 1888
- Species Navicula margaritifera Pantocsek, 1892
- Species Navicula marginata Lewis, 1862
- Species Navicula marginata (O'Meara) O'Meara, 1876 accepted as Pinnularia marginata O'Meara, 1869
- Species Navicula marginestriata Hustedt in Schmidt et al., 1936
- Species Navicula marginolineata Grove & Sturt, 1887
- Species Navicula marginonodularis Salah, 1953
- Species Navicula margino-nodularis Salah, 1953
- Species Navicula margino-ornata Salah, 1955
- Species Navicula marginopunctata Grove & Sturt, 1887
- Species Navicula marginulata Cleve, 1881
- Species Navicula maria Hohn, 1966
- Species Navicula mariagracielae D. Metzeltin, H. Lange-Bertalot & F. García-Rodríguez, 2005
- Species Navicula marina Ralfs, 1861 accepted as Petroneis marina (Ralfs) D.G.Mann, 1990
- Species Navicula marina Janisch & Rabenhorst, 1863
- Species Navicula mariposae Cholnoky, 1968
- Species Navicula marlieri Kufferath, 1957
- Species Navicula marmorata Jurilj, 1957
- Species Navicula marnieri Manguin, 1957
- Species Navicula marnierii Manguin, 1960
- Species Navicula martini Krasske, 1939 accepted as Lecohuia martinii (Krasske) Lange-Bertalot & U.Rumrich, 2000
- Species Navicula martinii Krasske, 1939 accepted as Lecohuia martinii (Krasske) Lange-Bertalot & U.Rumrich, 2000
- Species Navicula martonfii Pantocsek, 1892
- Species Navicula martyi Lauby, 1910
- Species Navicula mascarenae (Coste & Ricard) D. Metzeltin & H. Lange-Bertalot, 2002 accepted as Navicula vulpina var. mascarenae Coste & Ricard, 1982
- Species Navicula massadaea Ehrlich, 1978
- Species Navicula massalskiana Kochman-Kedziora, Olech & Van de Vijver, 2020
- Species Navicula mastogloidea Pantocsek, 1886
- Species Navicula matanza VanLandingham, 1975
- Species Navicula mauleri Brun, 1891
- Species Navicula mauriciana Van Heurck, 1909
- Species Navicula maxima Gregory, 1855 accepted as Caloneis liber (W.Smith) Cleve, 1894
- Species Navicula maxima sensu Donkin, 1872
- Species Navicula mayeri A. Cleve, 1953
- Species Navicula meadeensis Foged, 1968 accepted as Krsticiella meadeensis (Foged) M. Potapova
- Species Navicula mediacomplexa M.H.Hohn & Hellernan, 1963
- Species Navicula mediahelos M.H.Hohn & Hellerman, 1963
- Species Navicula medica Skvortzow, 1935
- Species Navicula medioconvexa Hustedt, 1961
- Species Navicula mediocostata Reichardt, 1988
- Species Navicula mediocriformis Coste & Ricard, 1983
- Species Navicula mediocris Krasske, 1932 accepted as Chamaepinnularia mediocris (Krasske) Lange-Bertalot & Krammer, 1996
- Species Navicula medioinflata Pantocsek, 1912
- Species Navicula mediopartita E.Grove ex A.Schmidt, 1896
- Species Navicula mediopunctata Hustedt in Schmidt et al., 1934
- Species Navicula mediterranea A.Schmidt, 1874 accepted as Navicula gemmata var. mediterranea Grunow, 1875
- Species Navicula mediterranea Cleve & Brun
- Species Navicula mediterranea Kützing, 1844
- Species Navicula megacuspida Carlson, 1913
- Species Navicula megalodon (Ehrenberg) Ralfs in Pritchard, 1861 accepted as Pinnularia megalodon Ehrenberg, 1854
- Species Navicula megaloptera (Ehrenberg) Héribaud, 1893
- Species Navicula megapolitana Heiden in Schmidt et al., 1903
- Species Navicula megastauros Cleve, 1883
- Species Navicula meisterii Pantocsek, 1912
- Species Navicula melanesica Lange-Bertalot & Steindorf in Moser, Steindorf & Lange-Bertalot, 1995
- Species Navicula melanocephala Giffen, 1975
- Species Navicula melchersi Kutner, 1961
- Species Navicula meleagris Kützing, 1844
- Species Navicula melovskii Z.Levkov & S.Krstic, 2007
- Species Navicula membranacea Cleve, 1897
- Species Navicula menageae Cholnoky, 1954
- Species Navicula menaiana Hendey, 1956
- Species Navicula menapiensis O'Meara, 1876
- Species Navicula menda J.R.Carter & Bailey-Watts, 1981
- Species Navicula mendica Mann, 1925
- Species Navicula mendosina Frenguelli, 1934 †
- Species Navicula mendotia VanLandingham, 1975
- Species Navicula mengeae Cholnoky, 1954
- Species Navicula menilitica Pantocsek, 1889
- Species Navicula meniscoides Hustedt, 1955
- Species Navicula meniscula
- Species Navicula menisculus Schumann, 1867 †
- Species Navicula menisculus sensu Krenner, 1926
- Species Navicula menisculus sensu Pantocsek, 1902
- Species Navicula meniscus J.Schumann, 1867
- Species Navicula meniscus sensu Meister, 1912
- Species Navicula mentzii Foged, 1962
- Species Navicula mereschkowskii
- Species Navicula meridiepacifica Hustedt
- Species Navicula meridionalis Hustedt, 1952
- Species Navicula meridiorecens D. Metzeltin, H. Lange-Bertalot & F. García-Rodríguez, 2005
- Species Navicula mersa Heiden
- Species Navicula mesogongyla (Ehrenberg) Kützing
- Species Navicula mesoleia Cleve in Cleve & Moller, 1879
- Species Navicula mesoleia Cleve, 1881
- Species Navicula mesolepta Ehrenberg, 1843 accepted as Pinnularia mesolepta (Ehrenberg) W.Smith, 1853
- Species Navicula mesolepta (W.Smith) Grunow, 1860 accepted as Pinnularia interrupta f. interrupta W. Smith, 1853
- Species Navicula mesolepta Heiberg, 1863
- Species Navicula mesolepta sensu Schmidt in Schmidt et al., 1876
- Species Navicula mesoleptoides Reinhard, 1869 (1870)
- Species Navicula mesopachya Ehrenberg, 1842
- Species Navicula mesotyla (Ehrenberg) Schmidt, 1876 accepted as Pinnularia mesotyla Ehrenberg, 1854
- Species Navicula mesotyla sensu Kutzing, 1844
- Species Navicula mesotyla sensu Schumann, 1867
- Species Navicula metareichardtiana Lange-Bertalot & Kusber in Kusber & Lange-Bertalot, 2019
- Species Navicula meulemansii A.Mertens, A.Witkowski & Lange-Bertalot, 2013
- Species Navicula mexicana (Heiden in Schmidt et al.) Mann, 1925 accepted as Caloneis mexicana Heiden, 1906
- Species Navicula meyeri Skvortzov, 1937
- Species Navicula meyeri Foged, 1966
- Species Navicula mica Hohn & Hellerman, 1963
- Species Navicula microcari Lange-Bertalot, 1993
- Species Navicula microcephala Grunow, 1868
- Species Navicula microdicta Cholnoky, 1962
- Species Navicula microdigitoradiata Lange-Bertalot, 1993
- Species Navicula microlyra Cholnoky, 1959
- Species Navicula micropunctata (H.Germain) H.Kobayasi & T.Nagumo, 1988 accepted as Navicula subtilissima var. micropunctata Germain, 1981
- Species Navicula micropupula Cholnoky, 1957
- Species Navicula microrhombus (Cholnoky) Schoeman & Archibald, 1977
- Species Navicula microrhynchus Grunow, 1882
- Species Navicula microrhynchus sensu Pantocsek, 1889
- Species Navicula microstauron (Ehrenberg) Héribaud, 1903 accepted as Stauroptera microstauron Ehrenberg, 1843
- Species Navicula microstauron (Ehrenberg) O'Meara, 1875
- Species Navicula microstoma Kützing, 1846
- Species Navicula microtatos
- Species Navicula migma M.H.Hohn & Hellerman, 1963
- Species Navicula mikado Pantocsek, 1892
- Species Navicula mikrotatos Pantocsek, 1886
- Species Navicula millotiana Manguin, 1952
- Species Navicula millsi Reinhold, 1937
- Species Navicula milthersii Foged, 1962
- Species Navicula mimicans Hanna, 1932
- Species Navicula mimula Mann, 1925
- Species Navicula mina Leuduger-Fortmorel, 1892
- Species Navicula minima Grunow, 1880
- Species Navicula minima sensu Foged, 1958
- Species Navicula minimoides Manguin ex Kociolek & Reviers, 1996
- Species Navicula minnewaukonensis Elmore, 1921
- Species Navicula minor Gregory, 1857
- Species Navicula minor De Toni, 1892
- Species Navicula minthe Hohn & Hellermann, 1963
- Species Navicula mintracta Carter & Denny, 1982
- Species Navicula minuscula Grunow, 1880 accepted as Adlafia minuscula (Grunow) Lange-Bertalot, 1999
- Species Navicula minusculoides Hustedt, 1942
- Species Navicula minuta Skvortzow, 1936
- Species Navicula minuta Sheshukova, 1956
- Species Navicula minutissima Grunow, 1860
- Species Navicula minutissima (Cleve) Frenguelli, 1924 accepted as Navicula scutelloides var. minutissima Cleve, 1881
- Species Navicula minutissima Rabenhorst, 1853
- Species Navicula minutula W.Smith, 1853
- Species Navicula miocenica Hajós, 1959
- Species Navicula mira Pantocsek & Greguss in Greguss, 1913
- Species Navicula mirabile (Hustedt) F.W. Mills, 1934 accepted as Neidium mirabile Hustedt, 1922
- Species Navicula mirabilis G.Leuduger-Fortmorel
- Species Navicula mirabilis Castracane, 1886
- Species Navicula mirabunda Pantocsek & Greguss in Greguss, 1913
- Species Navicula miramaris Frenguelli, 1925
- Species Navicula miramaris Frenguelli, 1930 accepted as Navicula cefarellii Vouilloud & Guerrero, 2021
- Species Navicula miranda Hustedt, 1964
- Species Navicula mirifica Krasske, 1949
- Species Navicula misella Hustedt, 1955
- Species Navicula misionera Frenguelli, 1953
- Species Navicula mitigata Hustedt, 1966
- Species Navicula mitis Hustedt, 1945
- Species Navicula mobiliensis Boyer, 1922 accepted as Luticola mobiliensis (C.S.Boyer) S.Mayama, 1998
- Species Navicula mocsarensis Pantocsek, 1892
- Species Navicula modesta Grunow, 1882
- Species Navicula modesta Cleve-Euler, 1948
- Species Navicula modica Hustedt, 1945
- Species Navicula moeandrina Cleve, 1893
- Species Navicula moenofranconica Lange-Bertalot, 1993
- Species Navicula moerckii Foged, 1966
- Species Navicula moesta Schmidt in Schmidt et al., 1881
- Species Navicula moesta sensu Wolle, 1890
- Species Navicula molaris Grunow, 1863 accepted as Caloneis molaris (Grunow) Krammer, 1985
- Species Navicula molesta Krasske, 1938 accepted as Craticula zizix (VanLandingham) Guiry, 2018
- Species Navicula molesta Mann, 1925
- Species Navicula molestiformis Hustedt, 1949
- Species Navicula mollicula Hustedt, 1945
- Species Navicula mollis (W.Smith) Cleve, 1896
- Species Navicula mollissima Hustedt, 1962
- Species Navicula monela Hohn, 1966
- Species Navicula mongolica Skvortzow, 1935
- Species Navicula mongolreinhardtii M.B.Edlund & N.Soninkhishing, 2009
- Species Navicula monile Ehrenberg, 1840
- Species Navicula monilifera Cleve, 1895 accepted as Petroneis monilifera (Cleve) A.J.Stickle & D.G.Mann, 1990
- Species Navicula monita Hustedt, 1966
- Species Navicula monmouthiana Grunow in Cleve & Grunow, 1880
- Species Navicula monmouthianastodderi Yermoloff, 1918
- Species Navicula monoculata Hustedt, 1945
- Species Navicula monodi Guermeur, 1954
- Species Navicula monodon Brun, 1891
- Species Navicula monradii Foged, 1966
- Species Navicula montana Schoeman, 1970
- Species Navicula montana Moghadam, 1969
- Species Navicula montanensis Moghadam, 1969
- Species Navicula montisatrae Cholnoky, 1959
- Species Navicula mooreana O'Meara, 1872
- Species Navicula moorosiana Schoeman, 1973
- Species Navicula moralesii D. Metzeltin & H. Lange-Bertalot, 2007
- Species Navicula moreii O'Meara, 1876
- Species Navicula mormonorum Grunow ex A.Schmidt, 1876
- Species Navicula morricei Hanna, 1932
- Species Navicula moskalii Metzeltin, Witkowski & Lange-Bertalot, 1996
- Species Navicula mossbergensis Cleve-Euler, 1953
- Species Navicula mossiana O'Meara, 1876
- Species Navicula motschii Meister, 1912
- Species Navicula mournei Patrick, 1959
- Species Navicula mucicola Hustedt, 1939
- Species Navicula mucicoloides Hustedt, 1942
- Species Navicula mucosa Meunier, 1915
- Species Navicula mucronata Elmore, 1921
- Species Navicula mucronula Pantocsek, 1902
- Species Navicula muelleri R.E.M. Archibald, 1983
- Species Navicula mugadensis Gandhi, 1959
- Species Navicula mujibensis Gerloff, Natour & Rivera, 1984
- Species Navicula multicopsiforme W. & G.S. West, 1911
- Species Navicula multicopsis
- Species Navicula multicostata Grunow, 1860
- Species Navicula multicostata sensu Schmidt in Schmidt et al., 1875
- Species Navicula multigramme M.H.Hohn & Hellerman, 1963
- Species Navicula multiperla Nygaard, 1956
- Species Navicula multiplex Van Landingham
- Species Navicula multiseriata Grunow in Cleve, 1881
- Species Navicula multistriata Patrick, 1936
- Species Navicula muncki Foged, 1972
- Species Navicula munda Janisch in Schmidt et al., 1881
- Species Navicula muralibionta Bock, 1970
- Species Navicula muraliformis Hustedt, 1949
- Species Navicula muraliformis H.P. Gandhi, 1998 accepted as Navicula canali-kharicutensis Guiry & Karthick, 2020
- Species Navicula muralis Grunow, 1880
- Species Navicula muraloides Hustedt, 1950
- Species Navicula murrayi West & G.S.West accepted as Luticola murrayi (West & G.S.West) D.G.Mann, 1990
- Species Navicula musca Gregory, 1857 accepted as Oestrupia musca (Gregory) Hustedt, 1935
- Species Navicula musca sensu Donkin, 1872
- Species Navicula muscaeformis Grunow
- Species Navicula muscaeformis Pantocsek, 1892
- Species Navicula muscatinei Reimer & Lee, 1986
- Species Navicula muscerda Hohn, 1961
- Species Navicula muscicola (J.B. Petersen) Cholnoky, 1964 accepted as Pinnularia muscicola J.B.Petersen, 1928
- Species Navicula musciformis Grunow, 1878
- Species Navicula muscora J.P.Kociolek & B.Reviers, 1996
- Species Navicula muscosa Skvortzow, 1938
- Species Navicula mutabilis Gregory, 1855
- Species Navicula mutata Krasske, 1929 accepted as Sellaphora mutata (Krasske) Lange-Bertalot, 1996
- Species Navicula mutica Kützing, 1844 accepted as Luticola mutica (Kützing) D.G.Mann, 1990
- Species Navicula mutica (Kützing) Frenguelli, 1924 accepted as Navicula mutica f. mutica Kützing, 1844
- Species Navicula mutica Grunow, 1860
- Species Navicula mutica sensu Rabenhorst, 1848-1860
- Species Navicula muticoides Hustedt, 1949
- Species Navicula muticopsiformis West & G.S.West, 1911
- Species Navicula muticopsis Van Heurck, 1909
- Species Navicula muticopsis Van Heurck accepted as Luticola muticopsis (Van Heurck) D.G.Mann, 1990
- Species Navicula mutico-rotaeana Brun, 1901
- Species Navicula muzafarovii A.Witkowski & H.Lange-Bertalot, 2012
- Species Navicula my Cleve, 1895
- Species Navicula nabrona Carter & Denny, 1982
- Species Navicula nagbogensis Foged, 1966
- Species Navicula nagjae H. Lange-Bertalot & D. Metzeltin, 2006
- Species Navicula nakai Skvortzov, 1971
- Species Navicula namibica Lange-Bertalot & Rumrich, 1993
- Species Navicula nana Ehrenberg, 1862
- Species Navicula nana Gregory
- Species Navicula nanella Conger, 1924
- Species Navicula nanissima (Manguin in Bourrelly & Manguin) D. Metzeltin & H. Lange-Bertalot, 2007 accepted as Navicula cryptocephala f. nanissima Manguin in Bourrelly & Manguin, 1952
- Species Navicula nansenii Foged, 1964
- Species Navicula narinosa Hohn, 1961
- Species Navicula nasuta Giffen, 1973
- Species Navicula natalensis Cholnoky, 1957
- Species Navicula natchikae Boye Petersen, 1946
- Species Navicula naumanii Hustedt, 1942 accepted as
- Species Navicula naumanni Hustedt, 1942
- Species Navicula nautica Cholnoky, 1963
- Species Navicula naveana Grunow, 1863
- Species Navicula navicularis (Ehrenberg) Edwards, 1906 accepted as Amphiprora navicularis Ehrenberg, 1843
- Species Navicula navigans Brun in Schmidt et al., 1892
- Species Navicula navrongensis Foged, 1966
- Species Navicula neapolitana (Rabenhorst) Ralfs in Pritchard, 1861 accepted as Falcatella neapolitana Rabenhorst, 1853
- Species Navicula nebulosa Gregory, 1857
- Species Navicula nebulosa Manguin in Bourrelly & Manguin, 1952
- Species Navicula nebulosa (Meneghini) Grunow, 1880
- Species Navicula neglecta Karsten, 1899
- Species Navicula neglecta Kützing, 1844
- Species Navicula neglecta (Thwaites) Petit, 1877 accepted as Schizonema neglectum Thwaites, 1848
- Species Navicula neglecta Krasske, 1929
- Species Navicula neidioides Manguin in Bourrelly & Manguin, 1952
- Species Navicula nemoris M.H.Hohn & Hellerman, 1963
- Species Navicula neocaledonica Manguin, 1962
- Species Navicula neocomplanata Hustedt, 1962
- Species Navicula neocruciata De Toni, 1891
- Species Navicula neogena Pantocsek, 1892
- Species Navicula neogradensis (Pantocsek) Cleve, 1895 accepted as Cocconeis neogradensis Pantocsek, 1886
- Species Navicula neoiridis
- Species Navicula neomundana (Lange-Bert. & Rumrich) Lange-Bert., Jarlman & Van de Vijver in Van de Vijver & Lange-Bertalot, 2009
- Species Navicula neoplicata Hustedt, 1962
- Species Navicula neoreversa VanLandingham, 1975
- Species Navicula neoseptentrionalis VanLandingham, 1971
- Species Navicula neoventricosa Hustedt F., 1964
- Species Navicula neoventricosa Hustedt, 1966 accepted as Luticola ventricosa (Kützing) D.G.Mann, 1990
- Species Navicula neowiesneri Chudaev & Kulikovskiy, 2016
- Species Navicula nepouiana (Maillard) Lange-Bertalot & Steindorf in Moser, Steindorf & Lange-Bertalot, 1995 accepted as Navicula rhynchocephala var. nepouiana Maillard, 1978
- Species Navicula nervosa Brebisson (in litt.?) ex Kutzing, 1849
- Species Navicula netroformis Andrews, 1971
- Species Navicula neumayeri Janisch in Schmidt et al., 1876
- Species Navicula neumayeriana Pantocsek, 1905
- Species Navicula neumayerii Pantocsek, 1892
- Species Navicula neupaueri Pantocsek, 1886
- Species Navicula nezsideriana Pantocsek, 1912
- Species Navicula niceaensis H. Peragallo, 1888
- Species Navicula nicobarica Grunow, 1863
- Species Navicula nicolai Pantocsek, 1902
- Species Navicula nidulans Cleve, 1891
- Species Navicula nielsfogedii J.C.Taylor & Cocquyt, 2016
- Species Navicula nienta J.R.Carter, 1966
- Species Navicula nigra Thum's slides
- Species Navicula nigri De Notaris in De Notaris & Baglietto, 1872
- Species Navicula nigricans Pantocsek, 1892
- Species Navicula nigrii De Notaris emend Granetti, 1968
- Species Navicula nimbus M.H.Hohn & Hellerman, 1963
- Species Navicula niobrara Andrews, 1970
- Species Navicula nipkowii Meister, 1932 accepted as Luticola nipkowii (Meister, 1932) Glushchenko & Kulikovskiy, 2015
- Species Navicula nippon Skvortzow, 1936
- Species Navicula nipponica (Skvortzov) Lange-Bertalot, 1993
- Species Navicula nitescens (Gregory) Ralfs, 1861 accepted as Navicula smithii var. nitescens Gregory, 1857
- Species Navicula nitida Smith ex Gregory
- Species Navicula nitrifuga Cholnoky, 1964
- Species Navicula nitrophila J.B.Petersen, 1928
- Species Navicula nitzschii Ehrenberg, 1837
- Species Navicula nivalis Ehrenberg, 1853
- Species Navicula nivaloides W.Bock, 1962
- Species Navicula nivellis Fusey, 1953
- Species Navicula nivorum M.Peragallo
- Species Navicula nobilis Kützing
- Species Navicula nodosa Ehrenberg, 1838 accepted as Pinnularia nodosa (Ehrenberg) W.Smith, 1856
- Species Navicula nodosa sensu Neupauer, 1867
- Species Navicula nodosa Schmidt in Schmidt et al., 1876
- Species Navicula nodulosa (Brébisson) Kützing
- Species Navicula nolens Simonsen, 1959
- Species Navicula nolensoides Bock, 1970
- Species Navicula nonana Cholnoky, 1966
- Species Navicula nootkana Bory, 1827
- Species Navicula norae Metzeltin, Lange-Bertalot & García-Rodríguez, 2005 accepted as Seminavis norae (Metzeltin, Lange-Bertalot & García-Rodriguez) D.M. Talgatti & L.C. Torgan, 2017
- Species Navicula nordenskioeldi Foged, 1964
- Species Navicula nordstedtiana Grunow in Cleve & Möller, 1879
- Species Navicula normalis Hustedt, 1955
- Species Navicula normaloides Cholnoky, 1968
- Species Navicula normanni Rebenhorst
- Species Navicula northumbrica Donkin, 1861
- Species Navicula northumricaeformis M. Peragallo in Héribaud et al., 1920
- Species Navicula norvegica (Ehrenberg) Kützing, 1844 accepted as Pinnularia norwegica (Ehrenberg) Ehrenberg, 1845
- Species Navicula norwegica Ehrenberg, 1840
- Species Navicula notabilis Greville, 1863 accepted as Diploneis notabilis (Greville) Cleve, 1894
- Species Navicula notabilis sensu Pantocsek, 1902
- Species Navicula notabilis Pantocsek, 1889
- Species Navicula notanda Østrup, 1913
- Species Navicula notanda Cleve-Euler, 1953
- Species Navicula notata M.Peragallo & Héribaud-Joseph, 1893 accepted as
- Species Navicula notha Wallace, 1960
- Species Navicula novadecipiens Hustedt, 1966
- Species Navicula novaeguineaensis Tempère in Brun et al., 1891
- Species Navicula novaeseelandiae Hustedt, 1964
- Species Navicula novaesiberica Lange-Bertalot, 1993
- Species Navicula nsutaensis Foged, 1966
- Species Navicula nubicola Grunow in Van Heurck, 1880
- Species Navicula nubila Manguin, 1964
- Species Navicula nuda Pantocsek, 1889
- Species Navicula nugalis M.H.Hohn & Hellerman, 1963
- Species Navicula nugax W. Smith in Greville, 1855
- Species Navicula nummularia Greville, 1859
- Species Navicula nummularioides M. Peragallo in Tempère & Peragallo, 1908
- Species Navicula nunguaensis Foged, 1966
- Species Navicula nunivakiana Patrick & Freese, 1961
- Species Navicula nutata Carter & Denny, 1982
- Species Navicula nuwukiana Patrick & Freese, 1961
- Species Navicula ny Cleve, 1894
- Species Navicula nyassensis Otto Müller, 1910 accepted as Sellaphora nyassensis (Otto Müller) D.G.Mann, 1989
- Species Navicula nyella Hustedt, 1964
- Species Navicula nympharum Hustedt in Schmidt et al., 1936
- Species Navicula oahuensis (Hustedt) Krammer, 1985 accepted as Cymbella oahuensis Hustedt, 1942
- Species Navicula oamaruensis Grunow in Schmidt et al., 1888
- Species Navicula oamaruensis (Cleve) Mann, 1907 accepted as Diploneis adonis var. oamaruensis Cleve, 1894
- Species Navicula oamaruensis Schrader, 1969
- Species Navicula obdurata Hohn & Hellermann, 1963
- Species Navicula oberohensis Hustedt, 1954
- Species Navicula obesa Otto Müller, 1910
- Species Navicula obesa (Greville) Mann, 1925 accepted as Stauroneis obesa Greville, 1865
- Species Navicula obiecta Cholnoky, 1964
- Species Navicula obligata Hustedt, 1966
- Species Navicula obliqua Ehrenberg in Ralfs in Pritchard, 1861
- Species Navicula obliqua (Gregory) Cleve, 1891 accepted as Gololobovia obliqua (W.Gregory) Kulikovskiy, Glushchenko & Kociolek in Kulikovskiy et al., 2020
- Species Navicula obliqua Turpin, 1816-1829
- Species Navicula oblique striata Schmidt in Schmidt et al., 1877
- Species Navicula oblita Mereschkowsky, 1902
- Species Navicula oblonga (Kützing) Kützing, 1844
- Species Navicula oblonga Østrup, 1910
- Species Navicula oblonga Neupauer, 1867
- Species Navicula oblonga Ehrenberg, 1843
- Species Navicula oblongella Nägeli ex Kützing, 1849 accepted as Diploneis oblongella (Nägeli ex Kützing) Cleve-Euler, 1922
- Species Navicula oblongella sensu Grunow, 1860
- Species Navicula oblongiformis Hustedt in Schmidt et al., 1934
- Species Navicula oblongolinearis (Kozlowski) De Toni, 1891 accepted as Pinnularia oblongolinearis Kozlowski, 1888
- Species Navicula oblongopunctata Zakrzewski, 1934
- Species Navicula obscura Hustedt, 1942
- Species Navicula obscura (Krasske) F.W.Mills, 1935 accepted as Pinnularia obscura var. obscura Krasske, 1932
- Species Navicula obscura Hustedt, 1937
- Species Navicula obscura Pantocsek, 1909
- Species Navicula observabilis Heiden & Kolbe, 1928
- Species Navicula observanda Simonsen, 1959
- Species Navicula obsidialis Hustedt, 1942
- Species Navicula obsita Hustedt, 1945 accepted as Pulchellophycus obsitus (Hustedt) Edlund & M.J.Wynne, 2019
- Species Navicula obsoleta Hustedt, 1942
- Species Navicula obstinata Krasske, 1939
- Species Navicula obtecta I.Jüttner & E.J.Cox
- Species Navicula obtusa W.Smith, 1853
- Species Navicula obtusa (Lagerstedt) Hustedt, 1909 accepted as Stauroneis obtusa f. obtusa Lagerstedt, 1873
- Species Navicula obtusa Bory, 1824
- Species Navicula obtusa Ehrenberg, 1843
- Species Navicula obtusa Bory, 1827
- Species Navicula obtusangula Hustedt, 1942
- Species Navicula obtusata Karajeva, 1964
- Species Navicula obtuseprotracta Hustedt, 1966 †
- Species Navicula obtuserostrata Hustedt, 1961
- Species Navicula ocalli Hohn, 1961
- Species Navicula occasa Giffen, 1975
- Species Navicula occidentalis Cleve, 1894
- Species Navicula occulta Krasske, 1929
- Species Navicula oceanica Ralfs in Pritchard, 1861 accepted as Pinnularia oceanica Ehrenberg, 1844
- Species Navicula oceanica (Karsten) Frenguelli, 1938 accepted as Navicula directa var. oceanica Karsten, 1905
- Species Navicula ocellata Østrup, 1904
- Species Navicula ocellata Mann, 1925
- Species Navicula ocellata Skvortzov
- Species Navicula ochridana Hustedt, 1945
- Species Navicula octavosignata Salah, 1953
- Species Navicula oculata Brébisson, 1854 accepted as Diploneis oculata (Brébisson) Cleve, 1894
- Species Navicula oculata Meunier, 1910
- Species Navicula oculiformis Hustedt, 1955
- Species Navicula oculus Østrup, 1897
- Species Navicula odiosa Wallace, 1960
- Species Navicula oerensis Cleve-Euler, 1953
- Species Navicula oestrupi P.Schulz, 1926 accepted as Hippodonta linearis (Østrup) Lange-Bertalot, Metzeltin & Witkowski, 1996
- Species Navicula oestrupi Cleve, 1896
- Species Navicula oestrupi Heiden in Schmidt et al., 1905
- Species Navicula oestrupii Héribaud in Héribaud et al., 1920
- Species Navicula oestrupii Pantocsek, 1908
- Species Navicula oestrupioides Hustedt, 1961
- Species Navicula oetzvallensis H. Lange-Bertalot in Werum & Lange-Bertalot, 2004
- Species Navicula ognjanovae Z.Levkov & D.Metzeltin, 2007
- Species Navicula ohiensis Ehrenberg, 1856
- Species Navicula okadae (Skvortzov) T.Nagumo & H.Kobayasi, 1990 accepted as Anomoeoneis okadae Skvortzov, 1938
- Species Navicula okawangoi Cholnoky, 1966
- Species Navicula okunoi Hustedt, 1966
- Species Navicula olgae Pantocsek, 1902
- Species Navicula oliffii Cholnoky, 1956
- Species Navicula oligotraphenta Lange-Bertalot & Hofmann, 1993
- Species Navicula olivacea Leuduger-Fortmorel, 1879
- Species Navicula olivieri Héribaud, 1903
- Species Navicula omearae Gogorev, 2018
- Species Navicula o'mearii
- Species Navicula omega Cleve, 1893
- Species Navicula omegopsis Hustedt, 1944
- Species Navicula omicron Cleve, 1895
- Species Navicula omissa Hustedt, 1945
- Species Navicula omitta Pantocsek, 1913
- Species Navicula omphalia Ehrenberg, 1844 (1845)
- Species Navicula onoensis Okuno, 1952
- Species Navicula opaia Schrader, 1969
- Species Navicula opalensis K.E. Lohman, 1957
- Species Navicula ophiocephala Cleve & Grove, 1891
- Species Navicula opiei Manguin ex Kociolek & Reviers, 1996
- Species Navicula opima Grunow, 1867
- Species Navicula opima (Grunow) Cleve accepted as Navicula fortis var. opima Grunow, 1868
- Species Navicula opimoides Cholnoky, 1959
- Species Navicula opportuna Hustedt, 1950
- Species Navicula oppressa Hustedt, 1952
- Species Navicula oppugnata Hustedt, 1945
- Species Navicula optima Hanna, 1932
- Species Navicula opuntioides Simonsen, 1959
- Species Navicula oranensis A. Schmidt
- Species Navicula orangiana Patrick, 1959 accepted as Dorofeyukea orangiana (R.M.Patrick) Kulikovskiy & Kociolek in Kulikovskiy et al., 2019
- Species Navicula orbiculata Patrick, 1959
- Species Navicula orbis J.R.Carter, 1981
- Species Navicula orbita Carter, 1966
- Species Navicula orcula Cholnoky, 1963
- Species Navicula ordinaria Hustedt, 1950
- Species Navicula ordinata Brébisson ex Ralfs in Pritchard, 1861
- Species Navicula oregonensis Hustedt, 1966
- Species Navicula oregonica (Ehrenberg) Kützing, 1849 accepted as Pinnularia oregonica Ehrenberg, 1845
- Species Navicula orellana Hohn, 1966
- Species Navicula orensis A. Cleve, 1953
- Species Navicula oribica Cholnoky, 1960
- Species Navicula orientata Karajeva, 1964
- Species Navicula oris Zanon, 1949
- Species Navicula ornata A.W.F.Schmidt
- Species Navicula orphei Pantocsek, 1905
- Species Navicula orthoneoides Hustedt, 1955
- Species Navicula ortolanae Hanna & Grant, 1926
- Species Navicula orvinii Foged, 1964
- Species Navicula oscitans A.W.F.Schmidt
- Species Navicula osculata Ehrenberg, 1842
- Species Navicula osculifera Cleve Ms. in Tempère & Peragallo, 1889-1895
- Species Navicula ostenfeldii Ostrup
- Species Navicula osterosa Giffen, 1976
- Species Navicula ostii Cholnoky, 1963
- Species Navicula ostracodarum Pantocsek, 1892
- Species Navicula ostrearia Turpin, 1827 accepted as Haslea ostrearia (Gaillon) Simonsen, 1974
- Species Navicula ostrearia (Gaillon) Bory, 1824 accepted as Vibrio ostrearius Gaillon, 1820
- Species Navicula ostrearia Bory, 1831
- Species Navicula ostrearia Bory, 1827
- Species Navicula ostrearia Kützing, 1849
- Species Navicula ostrobottnica Cleve-Euler, 1939
- Species Navicula ostrogothica Cleve-Euler, 1953
- Species Navicula ostrupii Héribaud in Héribaud et al., 1920
- Species Navicula oswaldii Janisch, 1888
- Species Navicula otrantina (Rabenhorst) Ralfs in Pritchard, 1861 accepted as Pinnularia otrantina Rabenhorst, 1853
- Species Navicula ovalis Hilse, 1875
- Species Navicula ovalis W.Smith, 1853
- Species Navicula ovalis Naegeli in Kutzing, 1849
- Species Navicula ovata H.P. Gandhi, 1998 accepted as Navicula gujaratensis Guiry & Karthick, 2020
- Species Navicula ovata M. Peragallo
- Species Navicula ovata M. Peragallo in Héribaud, 1893
- Species Navicula ovata (Grunow) Schütt, 1896 accepted as Schizostauron ovatum Grunow, 1867
- Species Navicula oviformis Cleve, 1895
- Species Navicula ovulum Schmidt, 1874
- Species Navicula ovulum Grunow, 1860
- Species Navicula ovumpaschale Schmidt in Schmidt et al., 1875
- Species Navicula ovum-paschale A.Schmidt, 1875 accepted as Mastogloia ovum-paschale (A.Schmidt) A.Mann, 1925
- Species Navicula oxeia Castracane, 1886
- Species Navicula oxylepta (Ehrenberg) De Toni, 1891 accepted as Pinnularia oxylepta Ehrenberg, 1856
- Species Navicula oxyphyllum Kützing, 1844
- Species Navicula oxyptera Kützing, 1844
- Species Navicula oxysphenia Ehrenberg, 1846
- Species Navicula oxytrachea (Ehrenberg) De Toni, 1891 accepted as Pinnularia oxytrachea Ehrenberg, 1856
- Species Navicula paanaensis A.Cleve, 1939
- Species Navicula paca Hohn & Hellerm., 1963
- Species Navicula pacardi I.Kaczmarska, 1985 †
- Species Navicula pacha Schrader, 1969
- Species Navicula pachycephala (Rabenhorst) Ralfs in Pritchard, 1861 accepted as Pinnularia pachycephala Rabenhorst, 1853
- Species Navicula pachycephala sensu Schumann, 1867
- Species Navicula pachyptera (Ehrenberg) Kützing, 1844 accepted as Pinnularia pachyptera Ehrenberg, 1843
- Species Navicula pacifica Grunow, 1867
- Species Navicula pacifica (Castracane) Mann, 1925 accepted as Stauroneis pacifica var. pacifica Castracane, 1886
- Species Navicula pacifica Meister, 1937
- Species Navicula paeninsulae Cholnoky, 1963
- Species Navicula pagesi Héribaud, 1902
- Species Navicula pagophila Grunow, 1884
- Species Navicula palea Hassall, 1845
- Species Navicula palea Skvortzov, 1936
- Species Navicula paleacea Pantocsek, 1902
- Species Navicula palearctica Hustedt, 1966
- Species Navicula palebralis
- Species Navicula palestinae Gerloff, Natour & Rivera, 1984
- Species Navicula pallavicinii Krasske, 1948 accepted as Nupela pallavicinii (Krasske) Lange-Bertalot in Lange-Bertalot & Moser, 1994
- Species Navicula pallescens T.Marsson, 1900
- Species Navicula pallida Hustedt, 1962
- Species Navicula palludinarum
- Species Navicula palpebralis Brébisson ex W.Smith, 1853
- Species Navicula palpebrulum Cholnoky, 1961
- Species Navicula paludinarum Pantocsek, 1892 †
- Species Navicula paludosa Hustedt, 1957
- Species Navicula palustris P.Fusey, 1948
- Species Navicula pampaeana Frenguelli accepted as Craticula pampeana (Frenguelli) Lange-Bertalot, 2003
- Species Navicula pampeana Frenguelli, 1926 accepted as Craticula pampeana (Frenguelli) Lange-Bertalot, 2003
- Species Navicula panda Lohman & Andrews, 1968
- Species Navicula pandura de Brébisson, 1854 accepted as Diploneis crabro var. pandura (Brébisson) Cleve, 1894
- Species Navicula panduriformis Baranov, 1942
- Species Navicula pangeroni Leuduger-Fortmorel, 1892
- Species Navicula panhalgarhensis H.P.Gandhi, 1959
- Species Navicula pannonica Grunow, 1860
- Species Navicula pannosa Frenguelli, 1953
- Species Navicula pantocseki Hajós, 1968
- Species Navicula pantocsekiana De Toni, 1891
- Species Navicula papilio D.E. Kellog, M. Stuiver; T.B. Kellogg & G.H. Denton, 1980
- Species Navicula papilioarea A.Witkowski, C.Riaux-Gobin & G.Daniszewska-Kowalczyk, 2010
- Species Navicula papillifera O'Meara, 1876
- Species Navicula papula A.W.F.Schmidt, 1875
- Species Navicula parabilis Hohn & Hellerman, 1963
- Species Navicula paracari Lange-Bertalot, 1993
- Species Navicula paradoxa Ehrenberg, 1843
- Species Navicula paradoxa Skvortzow, 1937
- Species Navicula parahasta Lange-Bertalot & Miho, 2001
- Species Navicula parallela (Brun) M.Peragallo, 1903 † accepted as Pinnularia parallela var. parallela Brun, 1895
- Species Navicula parallela Castracane, 1886
- Species Navicula parallelistriata Pantocsek, 1889
- Species Navicula paramutica Bock, 1962 accepted as Luticola paramutica (Bock) D.G.Mann, 1990
- Species Navicula paranipponica Lange-Bertalot, 1993
- Species Navicula paraobesa D.Metzeltin & Z.Levkov, 2007
- Species Navicula parapontica A.Witkowski, M.Kulikovskiy, E.Nevrova & H.Lange-Bertalot, 2010
- Species Navicula pararabda Schrader, 1969
- Species Navicula parasubtilissima H.Kobayasi & T.Nagumo, 1988
- Species Navicula paratunkae Boye Petersen, 1946
- Species Navicula parca A.Schmidt, 1875
- Species Navicula parca sensu Ostrup, 1895
- Species Navicula parentum Simonsen, 1959
- Species Navicula pargemina G.J.C.Underwood & M.L.Yallop, 1994
- Species Navicula parinacota Rumrich & H. Lange-Bertalot in U. Rumrich, H. Lange-Bertalot & M. Rumrich, 2000
- Species Navicula paripinnata Pantocsek, 1892
- Species Navicula parmula Brébisson ex Kützing, 1846
- Species Navicula parodia Hohn, 1961
- Species Navicula parsura Hustedt, 1962
- Species Navicula partabgarhensis Gandhi, 1955
- Species Navicula parthenopea Peragallo & Peragallo, 1908
- Species Navicula particulus Foged, 1971
- Species Navicula partita Mann, 1925
- Species Navicula parunculoides Hustedt, 1952
- Species Navicula parunculus Hustedt, 1952 accepted as Witkowskia parunculus (Hustedt) Kulikovskiy, Glushchenko, Mironov & Kociolek, 2024
- Species Navicula parva Skvortzow, 1935
- Species Navicula parva (Meneghini ex Kutzing) Cleve-Euler, 1953
- Species Navicula parvipendata Cholnoky, 1966
- Species Navicula parvula Ralfs, 1861
- Species Navicula parvula (Grunow) Hustedt, 1909
- Species Navicula parvula (Janisch) Schütt, 1896 accepted as Stauroneis parvula Janisch, 1862
- Species Navicula parvula (Kützing) Ehrenberg, 1838 accepted as Frustulia parvula Kützing, 1833 (1834)
- Species Navicula parvula H.L. Smith, 1878
- Species Navicula parvula sensu Lagerstedt, 1873
- Species Navicula pascuorum Cholnoky, 1965
- Species Navicula passerinii (De Notaris & Baglietto; Rabenhorst) De Toni, 1891 accepted as Pinnularia passerinii G.De Notaris
- Species Navicula patagonica (P.T.Cleve) M.Peragallo accepted as Caloneis patagonica (Cleve) Cleve, 1894
- Species Navicula patricia Mann, 1925
- Species Navicula patrickae Hustedt, 1955
- Species Navicula patrina Carter & Denny, 1982
- Species Navicula patula W.Smith, 1853
- Species Navicula paucicostata (Rabenhorst) Prochazka, 1923 accepted as Stauroptera paucicostata Rabenhorst, 1853
- Species Navicula paucis Krasske, 1949
- Species Navicula paucivisitata R.M.Patrick, 1959
- Species Navicula paulensis (Grunow Ms. in Cleve) Fricke, 1902 accepted as Pinnularia paulensis Grunow ex Cleve, 1895
- Species Navicula paulina (Ehrenberg) H.W. Reichardt, 1871 accepted as Pinnularia paulina Ehrenberg, 1862
- Species Navicula paul-schulzii Witkowski & Lange-Bertalot
- Species Navicula paulseniana J.B.Petersen, 1930
- Species Navicula pauper Mann, 1925
- Species Navicula paupercula Lange-Bertalot & U.Rumrich
- Species Navicula pavida Pantocsek, 1892
- Species Navicula pavillardi Hustedt, 1939
- Species Navicula pavillardii Hustedt, 1939
- Species Navicula paynei Ross, 1972
- Species Navicula pectinalis Brébisson in litt., W. Smith, 1856
- Species Navicula peculiarisis Salah & Tamas, 1968
- Species Navicula pedalis Brun, 1891
- Species Navicula pediculus Cleve, 1896
- Species Navicula peguana (Grunow in Cleve & Möller) Hustedt, 1966 accepted as Navicula mutica var. peguana Grunow, 1894
- Species Navicula peguenensis Moura, 1963
- Species Navicula peisonis Grunow
- Species Navicula peisonis sensu Schmidt in Schmidt et al., 1877
- Species Navicula peisonis sensu Pantocsek, 1902
- Species Navicula pelagi Schmidt in Schmidt et al., 1875
- Species Navicula pelagica Cleve, 1896
- Species Navicula pellicola Brockmann, 1950
- Species Navicula pelliculosa (Kützing) Hilse, 1863 accepted as Synedra minutissima var. pelliculosa Kützing, 1849
- Species Navicula pelliculosa Rabenhorst, 1864
- Species Navicula pellucida O'Meara, 1867
- Species Navicula pellucida Karsten, 1905
- Species Navicula pellucida (Kützing) Ehrenberg, 1838 accepted as Frustulia pellucida Kützing, 1833
- Species Navicula pellucidoides Hustedt, 1962
- Species Navicula pellucidula Hustedt
- Species Navicula pelta Hohn, 1966
- Species Navicula peltoensis A.Cleve, 1934
- Species Navicula peltoensis sensu Cleve-Euler, 1953
- Species Navicula peltoides Hendey, 1958
- Species Navicula pennata A.Schmidt, 1876
- Species Navicula pennsylvanica Patrick, 1966
- Species Navicula pensacolae Cleve, 1881
- Species Navicula penzhica Lupikina & Dolmatova, 1985
- Species Navicula peracuta (Maillard) Lange-Bertalot & Steindorf in Moser, Steindorf & Lange-Bertalot, 1995 accepted as Navicula eichhorniaephila var. peracuta Maillard, 1978
- Species Navicula peragalli Brun, 1891
- Species Navicula peragalli Frenguelli, 1923
- Species Navicula perangustissima Y.Li et Metzeltin iin Li et al., 2020
- Species Navicula peratomus Hustedt, 1957
- Species Navicula peraustralis West & G.S.West, 1911
- Species Navicula perducta Pantocsek, 1892
- Species Navicula perdurrans Pantocsek, 1902
- Species Navicula peregrina (Ehrenberg) Kützing, 1844
- Species Navicula peregrina sensu Pantocsek, 1902
- Species Navicula peregrinoides Muzafarov, 1952
- Species Navicula peregrinoides A. Cleve(-Euler) in Halden, 1917
- Species Navicula peregrinopsis H. Lange-Bertalot & A. Witkowski in A. Witkowski, H. Lange-Bertalot & D. Metzeltin, 2000
- Species Navicula perelegans Hustedt, 1952
- Species Navicula perennis Pantocsek, 1903
- Species Navicula perexigua Østrup, 1910
- Species Navicula perfecta Pantoscek, 1886 accepted as Lyrella perfecta (Pantoscek) D.G.Mann, 1990
- Species Navicula perfida Manguin ex Kociolek & Reviers, 1996
- Species Navicula perfidissima Lange-Bertalot, 1989
- Species Navicula pergamonensis Foged, 1982
- Species Navicula perhibita Hustedt, 1950
- Species Navicula perhyalina Cleve-Euler, 1953
- Species Navicula peripontica H. Lange-Bertalot & D. Metzeltin, 2006
- Species Navicula peripunctata Brun, 1891
- Species Navicula perlata Marsson, 1900
- Species Navicula perlata Hustedt in Schmidt et al., 1934
- Species Navicula perlatoides Hustedt, 1966
- Species Navicula perlepida Grunow, 1884
- Species Navicula perlepida Cleve, 1883
- Species Navicula perlonga Pantocsek, 1889
- Species Navicula perlucens Østrup, 1895
- Species Navicula perlucida Hustedt, 1937
- Species Navicula permagna (Bailey) A.M.Edwards, 1860 accepted as Caloneis permagna (Bailey) Cleve, 1894
- Species Navicula permagna (Bailey) A.M.Edwards, 1859 accepted as Caloneis permagna (Bailey) Cleve, 1894
- Species Navicula permanga (Bailey) A.M. Edwards, 1859 accepted as Pinnularia permagna Bailey, 1851
- Species Navicula perminuta Grunow, 1880
- Species Navicula perminuta Østrup, 1913
- Species Navicula permitis Hustedt, 1945
- Species Navicula permulsa Hustedt in Schmidt et al., 1934
- Species Navicula perobesa Hustedt, 1934 †
- Species Navicula peroblonga D. Metzeltin, H. Lange-Bertalot & S. Nergui, 2009
- Species Navicula peroi Gogorev, 2018
- Species Navicula perotettii (Grunow) Grunow, 1877
- Species Navicula perotii Patrick & Freese, 1961
- Species Navicula perparva Hustedt, 1937
- Species Navicula perpendicularis Cleve-Euler, 1953
- Species Navicula perpicea M.S.Kulikovskiy, H.Lange-Bertalot & D.Metzeltin, 2012
- Species Navicula perplexa H.Peragallo & M.Peragallo, 1897
- Species Navicula perplexoides Hustedt, 1964
- Species Navicula perpusilla Grunow, 1860 accepted as Humidophila perpusilla (Grunow) Lowe, Kociolek, Johansen, Van de Vijver, Lange-Bertalot & Kopalová, 2014
- Species Navicula perrhombus Hustedt ex Simonsen
- Species Navicula perrostrata Hustedt in Schmidt et al., 1936
- Species Navicula perrotetii
- Species Navicula perrotettii (Grunow) Cleve, 1894 accepted as Craticula perrotettii Grunow, 1868 '1867'
- Species Navicula perrotettii (Grunow) Grunow, 1877 accepted as Craticula perrotettii Grunow, 1868 '1867'
- Species Navicula perryana Kitton, 1873
- Species Navicula persculpta Pantocsek, 1903
- Species Navicula persica Rabenhorst, 1853
- Species Navicula persignata Cholnoky, 1968
- Species Navicula pertensa Giffen, 1967
- Species Navicula pertenuis Hustedt, 1934
- Species Navicula pertenuis Hustedt in Schmidt et al., 1934
- Species Navicula pertinax Cholnoky, 1960
- Species Navicula perturbata Jurilj, 1954
- Species Navicula pervasta Pantocsek, 1892
- Species Navicula perventralis Hustedt, 1937
- Species Navicula peterseni Hustedt, 1937
- Species Navicula petersenii Hustedt, 1937
- Species Navicula petersii (Ehrenberg) Kützing, 1849 accepted as Pinnularia petersii Ehrenberg, 1845
- Species Navicula peticolasii M.Peragallo, 1909
- Species Navicula petilina Carter & Denny, 1982
- Species Navicula petitiana Grunow in Cleve, 1881
- Species Navicula petrmarvanii Falasco & Ector, 2009
- Species Navicula petrovii E.Nevrova; A.Witkowski, J.P.Kociolek & H.Lange-Bertalot, 2014
- Species Navicula petrovskae Z.Levkov & S.Krstic, 2007
- Species Navicula peudolucidula Guermeur, 1954
- Species Navicula peysonis
- Species Navicula pfitzeriana O'Meara, 1876
- Species Navicula pfitzeriana O. Witt
- Species Navicula phalangium Pantocsek, 1892
- Species Navicula phantasma Hohn, 1966
- Species Navicula phi Cleve, 1895
- Species Navicula philippina Skvortzow, 1937
- Species Navicula philippinarum Mann, 1925
- Species Navicula philippinica De Toni, 1891
- Species Navicula philopena Ehrenberg
- Species Navicula phoenicenteron (Nitzsch) Ehrenberg, 1836 accepted as Stauroneis phoenicenteron (Nitzsch) Ehrenberg, 1843
- Species Navicula phyllepta Kützing, 1844
- Species Navicula phylleptosoma Lange-Bertalot, 1999
- Species Navicula phylleptosomaformis Seddon & Witkowski, 2011
- Species Navicula phyllodes (Ehrenberg) Ehrenberg, 1854 accepted as Stauroneis phyllodes var. phyllodes Ehrenberg, 1843
- Species Navicula phyllophaena Ehrenberg, 1872
- Species Navicula pi Cleve, 1893
- Species Navicula picea M.S.Kulikovskiy, H.Lange-Bertalot & D.Metzeltin, 2012
- Species Navicula picta Ehrenberg, 1835
- Species Navicula pieli Voigt, 1949
- Species Navicula pierre-comperei H.Lange-Bertalot & G.Hofmann, 2014
- Species Navicula pileda Gregory, 1856
- Species Navicula pinguis Mann, 1907
- Species Navicula pinna Chin & Cheng, 1979
- Species Navicula pinnata Pantocsek, 1889
- Species Navicula pinnularia Cleve, 1868 accepted as Pinnularia quadratarea (A.Schmidt) Cleve, 1895
- Species Navicula pinnularia Meunier, 1910
- Species Navicula pinnularioides Østrup
- Species Navicula pisciculus (Ehrenberg) Kützing, 1844 accepted as Pinnularia pisciculus Ehrenberg, 1843
- Species Navicula pistillum Bleisch, 1863
- Species Navicula pitoti Guermeur, 1954
- Species Navicula placenta Ehrenberg, 1854 accepted as Decussiphycus placenta (Ehrenberg) Guiry & Gandhi, 2019
- Species Navicula placentiformis Hustedt, 1944
- Species Navicula placentula (Ehrenberg) Kützing, 1844 accepted as Placoneis placentula (Ehrenberg) Mereschkowsky, 1903
- Species Navicula placentula sensu Pantocsek, 1902
- Species Navicula placida A.W.F.Schmidt
- Species Navicula placita Grove & Sturt, 1887
- Species Navicula plagiostoma Grunow, 1879
- Species Navicula plana Hustedt in Schmidt et al., 1936
- Species Navicula planamembranacea Hendey, 1964
- Species Navicula planiceps Cleve-Euler, 1953
- Species Navicula platalea Ehrenberg, 1842
- Species Navicula platensis (Frenguelli in Frenguelli & Cordini) Cholnoky, 1964 accepted as Navicula brasiliana var. platensis Frenguelli in Frenguelli & Cordini, 1937
- Species Navicula platessa Cleve, 1881 accepted as Diploneis platessa Cleve & Grove in Cleve, 1894
- Species Navicula plathi Brockmann, 1950
- Species Navicula platycephala Otto Müller, 1899
- Species Navicula platycephala (Ehrenberg) Cleve & Möller, 1882 accepted as Pinnularia platycephala (Ehrenberg) Cleve, 1891
- Species Navicula platysoma (Ehrenberg) De Toni, 1891 accepted as Pinnularia platysoma Ehrenberg, 1854
- Species Navicula platystoma Ehrenberg, 1838
- Species Navicula platyventris Meister, 1934 (1935)
- Species Navicula plaudinarum
- Species Navicula plausibilis Hustedt, 1966
- Species Navicula plena (O'Meara) De Toni, 1891 accepted as Pinnularia plena O'Meara, 1867
- Species Navicula pletura Hohn, 1961
- Species Navicula pleuronectes (Ehrenberg) De Toni, 1891
- Species Navicula pleurophora Kützing, 1844
- Species Navicula pleurostauroides Frenguelli, 1945
- Species Navicula pleurostaurum Mann, 1907
- Species Navicula plicata Donkin, 1873
- Species Navicula plicata Bodeanu, 1976
- Species Navicula plicatoides Hustedt, 1962
- Species Navicula plicatula Grunow in Cleve & Möller, 1878
- Species Navicula plitvicensis Hustedt, 1945
- Species Navicula plumbicolor O'Meara, 1876
- Species Navicula pluscula Cholnoky, 1960
- Species Navicula plutonia O'Meara, 1872
- Species Navicula poconoensis Patrick, 1945
- Species Navicula podolica Gaponov, 1915
- Species Navicula podzorskii Lange-Bertalot, 1993
- Species Navicula poirieri Lauby, 1910
- Species Navicula polae Heiden, 1903
- Species Navicula polaris Lagerstedt, 1873
- Species Navicula poli Nicolucci, 1842
- Species Navicula polita Brun, 1891
- Species Navicula polyconfusa VanLandingham, 1975
- Species Navicula polygibba Pantocsek, 1892
- Species Navicula polygona Brun, 1891
- Species Navicula polygramma sensu Fricke, 1902 accepted as Stauroneis polygramma Ehrenberg, 1843
- Species Navicula polymorpha Lagerstedt, 1873
- Species Navicula polyonca Brébisson, 1849
- Species Navicula polyplexa VanLandingham, 1975
- Species Navicula polyptera Ehrenberg
- Species Navicula polysticta Greville, 1859
- Species Navicula polystricta
- Species Navicula ponticula Giffen, 1970
- Species Navicula ponticulus K. McCartney & S.W. Wise Jr., 1990
- Species Navicula pontifica Mann, 1925
- Species Navicula poretzkajae Koretkevich, 1959 accepted as Proschkinia poretzkajae (Koretkevich) D.G.Mann, 1990
- Species Navicula poretzkiae Korotkevich, 1960
- Species Navicula poretzkyi Jouravleva, 1936
- Species Navicula porifera Hustedt, 1944
- Species Navicula porifera Jurilj, 1957
- Species Navicula porrecta (Ehrenberg) Kützing, 1844
- Species Navicula porta-aurata A.Witkowski, H.Lange-Bertalot & M.Bak, 2009
- Species Navicula portanova Riznyk, 1973
- Species Navicula portaregiensis A. Berg, 1952
- Species Navicula porticola Cholnoky, 1963
- Species Navicula portomontana Cleve, 1894
- Species Navicula portomonttana
- Species Navicula poseidon Cholnoky, 1968
- Species Navicula potzgeri C.W.Reimer, 1961
- Species Navicula powelli F.W.Lewis, 1861 accepted as Oestrupia powellii (Lewis) Heiden ex Hustedt, 1935
- Species Navicula powellii sensu H. Peragallo, 1888
- Species Navicula pozzuoliensis VanLandingham, 1975
- Species Navicula praecepta A. Berg in Berg & Hessland, 1949
- Species Navicula praeclara Pantocsek, 1892
- Species Navicula praedicabilis Simonsen, 1959
- Species Navicula praedii Cholnoky & Claus, 1961
- Species Navicula praeflua Pantocsek, 1892
- Species Navicula praegnans Skuja, 1937
- Species Navicula praerupta Hustedt, 1944
- Species Navicula praesecta Schmidt, 1874
- Species Navicula praestes Schmidt in Schmidt et al., 1875
- Species Navicula praestoeensis M.Møller, 1950
- Species Navicula praeterita Hustedt, 1945
- Species Navicula praetexta Ehrenberg, 1860
- Species Navicula praetexta sensu Truan y Luard & Witt, 1888
- Species Navicula pragma M.H.Hohn & Hellerman, 1963
- Species Navicula pragmatica Giffen, 1967
- Species Navicula preissei (Ehrenberg) De Toni, 1891 accepted as Pinnularia preissei Ehrenberg, 1854
- Species Navicula prespanensis Z.Levkov & D.Metzeltin, 2007
- Species Navicula pressa Pantocsek, 1892
- Species Navicula primigena
- Species Navicula primordialis Pantocsek, 1892
- Species Navicula prinslooii Schoeman, 1969
- Species Navicula prisca Schmidt in Schmidt et al., 1875
- Species Navicula pristina Afanas'eva in Afanas'eva & Gleser, 1986
- Species Navicula pristiophora Janisch in Schmidt et al., 1881
- Species Navicula probabilis Schmidt in Schmidt et al., 1877
- Species Navicula problematica Azpeitia, 1911
- Species Navicula problematica Cleve-Euler, 1915
- Species Navicula problematica Østrup, 1908
- Species Navicula proboscoidea Heiden, 1900
- Species Navicula procera Pantocsek, 1889
- Species Navicula prodiga Mann, 1907
- Species Navicula producta W.Smith, 1853 accepted as Neidium productum (W.Smith) Cleve, 1894
- Species Navicula producta Brébisson
- Species Navicula producta Pantocsek, 1905
- Species Navicula producta sensu Dippel, 1905
- Species Navicula producta Ralfs in Pritchard, 1861
- Species Navicula producta (Grunow) Forti, 1902
- Species Navicula prominula Schmidt in Schmidt et al., 1875
- Species Navicula promota Archibald, 1971
- Species Navicula propinqua Schmidt in Schmidt et al., 1875
- Species Navicula propinqua Cleve-Euler, 1953
- Species Navicula proserpinae (Ehrenberg) Ralfs in Pritchard, 1861 accepted as Diploneis proserpinae Ehrenberg, 1858
- Species Navicula proserpinae Pantocsek
- Species Navicula proserpinae Rabenhorst, 1864
- Species Navicula protearum Cholnoky, 1959
- Species Navicula protracta (Grunow) Cleve, 1894
- Species Navicula protracta Grunow, 1880
- Species Navicula protracta sensu Hustedt, 1950
- Species Navicula protracta Kustner, 1914
- Species Navicula protractoides Hustedt, 1957
- Species Navicula protrudens Mann, 1925
- Species Navicula proveniens Cholnoky, 1961
- Species Navicula proxima Janisch in Schmidt et al., 1881
- Species Navicula pseudacceptata H.Kobayasi, 1986
- Species Navicula pseudagrestis Lund, 1946
- Species Navicula pseudagrestis sensu Foged, 1958
- Species Navicula pseudanglica Lange-Bertalot, 1985
- Species Navicula pseudanglica Cleve-Euler, 1948
- Species Navicula pseudannulata Frenguelli, 1941
- Species Navicula pseudatomus Lund, 1946
- Species Navicula pseudoacceptata Kobayasi in Kobayasi & Mayama, 1986
- Species Navicula pseudoaffinis Mann, 1925
- Species Navicula pseudoanglica Foged & Moller, 1968
- Species Navicula pseudoantonii Z.Levkov & D.Metzeltin, 2007
- Species Navicula pseudoapproximata Hendey, 1958
- Species Navicula pseudoarvensis Hustedt, 1942
- Species Navicula pseudoaspera Pantocsek, 1892
- Species Navicula pseudobacillum Grunow, 1880 accepted as Sellaphora pseudobacillum (Grunow) Lange-Bertalot & Metzeltin, 2009
- Species Navicula pseudobrasiliana A.Tuji, 2003
- Species Navicula pseudobrehmii Hustedt, 1966
- Species Navicula pseudobrevissima Manguin in Bourrelly & Manguin, 1952
- Species Navicula pseudobrockmannii Manguin, 1964
- Species Navicula pseudobryophila Hustedt, 1942
- Species Navicula pseudocari Krasske, 1939
- Species Navicula pseudocarinifera Manguin, 1960
- Species Navicula pseudocarminata Manguin, 1952
- Species Navicula pseudocincta De Toni, 1891
- Species Navicula pseudocitrus Manguin in Bourrelly & Manguin, 1954
- Species Navicula pseudoclamans J.R.Carter, 1981
- Species Navicula pseudoclavata Mann, 1925
- Species Navicula pseudoclementis Hustedt, 1952 accepted as Witkowskia pseudoclementis (Hustedt) Kulikovskiy, Glushchenko, Mironov & Kociolek, 2024
- Species Navicula pseudococconeiformis Poretzky, 1925
- Species Navicula pseudocomides Hendey, 1964
- Species Navicula pseudocomoides Hendey, 1964 accepted as Navicula comoides (Agardh) H.Peragallo
- Species Navicula pseudoconcamerata Maillard, 1978
- Species Navicula pseudoconfervacea Manguin, 1952
- Species Navicula pseudoconstans Foged, 1968
- Species Navicula pseudocontenta Manguin in Bourrelly & Manguin, 1952
- Species Navicula pseudocrassirostris Hustedt, 1961
- Species Navicula pseudocrucicula Kobayasi, 1975 accepted as Prestauroneis pseudocrucicula (Kobayasi) Glushchenko, Kulikovskiy & Kociolek
- Species Navicula pseudocryptocephala Foged, 1958
- Species Navicula pseudocurta Manguin, 1962
- Species Navicula pseudocurta Cholnoky, 1955
- Species Navicula pseudocuspidata Gandhi
- Species Navicula pseudodahurica H. Kobayasi in Kobayasi et al., 1977
- Species Navicula pseudodemararae Hustedt in Schmidt et al., 1930
- Species Navicula pseudodemerae
- Species Navicula pseudodicephala Fritsch & Rich, 1929
- Species Navicula pseudodispensata Manguin, 1964
- Species Navicula pseudodispersa Schrader, 1969
- Species Navicula pseudodissipata H. Kobayasi in Kobayasi et al., 1977
- Species Navicula pseudoexilissima Hustedt, 1962
- Species Navicula pseudofaceta Guermeur, 1954
- Species Navicula pseudoforcipata Hustedt, 1942
- Species Navicula pseudofossalis Krasske, 1948
- Species Navicula pseudofrickia Patrick, 1959
- Species Navicula pseudofrugalis H.P. Gandhi, 1998
- Species Navicula pseudofusca Pantocsek, 1886
- Species Navicula pseudogamma Giffen, 1967
- Species Navicula pseudogastrum Aleem, 1958
- Species Navicula pseudogemmata Pantocsek, 1892
- Species Navicula pseudoglacialis
- Species Navicula pseudogracilis Hustedt, 1927 †
- Species Navicula pseudogracilis Skvortzow, 1937
- Species Navicula pseudographa Manguin, 1952
- Species Navicula pseudogrimmei Compère, 1970
- Species Navicula pseudohalophila Cholnoky, 1960
- Species Navicula pseudohamulata Guermeur, 1964
- Species Navicula pseudohasta E.Manguin ex Kociolek & Reviers, 1996
- Species Navicula pseudohasta Z. Levkov, M.B. Edlund & T. Nakov, 2008
- Species Navicula pseudohochstetteri M. Peragallo, 1929
- Species Navicula pseudohumilis Amossé, 1932
- Species Navicula pseudoincerta Giffen, 1970
- Species Navicula pseudoinflata Giffen, 1975
- Species Navicula pseudoingrata Manguin, 1964
- Species Navicula pseudoinsociabilis Manguin in Bourrelly & Manguin, 1949
- Species Navicula pseudokotschyi Lange-Bertalot, 1985
- Species Navicula pseudokrasskei Cholnoky, 1954
- Species Navicula pseudokryokonites M. Peragallo, 1921
- Species Navicula pseudolacertosa Cholnoky, 1966
- Species Navicula pseudolacustris Skabichevskií, 1936 accepted as Placoneis pseudolacustris (Skabitschewsky, 1936) Kulikovskiy, Lange-Bert. & Khursevich, 2015
- Species Navicula pseudolagerheimi H.P.Gandhi, 1967
- Species Navicula pseudolagerstedtii Cholnoky, 1960 accepted as Geissleria pseudolagerstedtii (Cholnoky) J.C.Taylor & Cocquyt
- Species Navicula pseudolanceolata Lange-Bertalot, 1980
- Species Navicula pseudolapidosa Manguin, 1964
- Species Navicula pseudo-libellus T. West, 1860
- Species Navicula pseudo-libellus Attheya
- Species Navicula pseudolinearis Hustedt, 1922
- Species Navicula pseudolitoricola Hakansson, 1980
- Species Navicula pseudolucidula Guermeur, 1954
- Species Navicula pseudomastogloia Fontell in Ms. ex Cleve-Euler, 1953
- Species Navicula pseudomediopartita Schrader, 1969
- Species Navicula pseudomembranacea Cleve-Euler, 1952
- Species Navicula pseudomenisculus J.R.Carter, 1981
- Species Navicula pseudominuscula Fusey, 1950
- Species Navicula pseudomitis Hustedt, 1950
- Species Navicula pseudomuraliformis Simonsen, 1987
- Species Navicula pseudomuralis Hustedt, 1937
- Species Navicula pseudomutica Hustedt, 1955
- Species Navicula pseudomuticopsis Stone in McLaughlin & Stone, 1986
- Species Navicula pseudonaumannii Manguin, 1964
- Species Navicula pseudonivalis Bock, 1970
- Species Navicula pseudonony Hustedt, 1955
- Species Navicula pseudony Hustedt, 1955
- Species Navicula pseudopalpebralis Hendey, 1964
- Species Navicula pseudoparunculus Hustedt, 1952
- Species Navicula pseudopelliculosa Manguin, 1952
- Species Navicula pseudopima Hustedt, 1954
- Species Navicula pseudoplacentula Foged & Moller, 1968
- Species Navicula pseudoporifera Hustedt, 1952 accepted as Witkowskia pseudoporifera (Hustedt) Kulikovskiy, Glushchenko, Mironov & Kociolek, 2024
- Species Navicula pseudoppugnata Lange-Bertalot & Miho, 2001
- Species Navicula pseudopupula Krasske, 1923 accepted as Sellaphora pseudopupula (Krasske) Lange-Bertalot, 1996
- Species Navicula pseudoquadratarea Heiden in Schmidt et al., 1905
- Species Navicula pseudoramphoides Stone in McLaughlin & Stone, 1986
- Species Navicula pseudoreinhardti Patrick, 1959
- Species Navicula pseudoretusa Peragallo & Peragallo, 1897
- Species Navicula pseudorhynchocephala Poretzky ex Proschkina-Lavrenko, 1950
- Species Navicula pseudorhynchocephala Poretzky, 1953
- Species Navicula pseudorthoneoides Foged, 1975
- Species Navicula pseudorupicola Fusey, 1953
- Species Navicula pseudosalinarum Giffen, 1975
- Species Navicula pseudo-schoenfeldii Skvortzow, 1971
- Species Navicula pseudoschumanniana Hustedt, 1914
- Species Navicula pseudoscutiformis Hustedt, 1930
- Species Navicula pseudosemilyrata R.Simonsen, 1959
- Species Navicula pseudoseminulum Skvortzow, 1935
- Species Navicula pseudosepta Patrick, 1961
- Species Navicula pseudosilicula Hustedt
- Species Navicula pseudosiliculaoides Foged, 1968
- Species Navicula pseudostauropteroides Fritsch & Rich, 1929
- Species Navicula pseudostrearia Aleem, 1973
- Species Navicula pseudostundlii Barber & Carter, 1971
- Species Navicula pseudosubtilis Fusey, 1964
- Species Navicula pseudosubtilissima Manguin in Bourrelly & Manguin, 1952
- Species Navicula pseudosydowii Schoeman & Archibald, 1988
- Species Navicula pseudotamnaena Guermeur, 1954
- Species Navicula pseudotantula Guermeur, 1954
- Species Navicula pseudotemeraria Schoeman, 1973
- Species Navicula pseudotenelloides Krasske, 1938
- Species Navicula pseudotenelloides Cholnoky, 1955
- Species Navicula pseudotenelloides Maillard, 1966
- Species Navicula pseudotenera Manguin, 1962
- Species Navicula pseudothienemanni H.P.Gandhi, 1967
- Species Navicula pseudotuscula Hustedt, 1943
- Species Navicula pseudotuscula sensu Brockman, 1950
- Species Navicula pseudoventosa Schoeman, 1973
- Species Navicula pseudoventralis Hustedt, 1936
- Species Navicula pseudowiesneri Chudaev & Kulikovskiy, 2016
- Species Navicula psychrophila Grunow
- Species Navicula pterophena (Ehrenberg) De Toni, 1891
- Species Navicula puacivistata Patrick, 1959
- Species Navicula puchella sensu Heiden & Kolbe, 1928
- Species Navicula pudens Mann, 1925
- Species Navicula pudibundus Foged, 1971
- Species Navicula pudica Cholnoky, 1959
- Species Navicula puella Schumann, 1867
- Species Navicula puella A.Schmidt, 1875
- Species Navicula puella Peragallo & Peragallo, 1897
- Species Navicula pugio Mann, 1925
- Species Navicula pulchella Heiden
- Species Navicula pulcherrima Leuduger-Fortmorel ex Tempère & Peragallo, 1915
- Species Navicula pulchra Gregory, 1856
- Species Navicula pulchra (Østrup) Peragallo, 1897-1908 accepted as Pinnularia pulchra f. pulchra Østrup, 1897
- Species Navicula pulchripora Kaczmarska & Chan, 1995
- Species Navicula pullus Hustedt, 1955
- Species Navicula pulverea Cholnoky, 1963
- Species Navicula pulverentula Woodhead & Tweed, 1960
- Species Navicula pulvulenta Mann, 1925
- Species Navicula pumila Grunow, 1880 accepted as Navicula cryptocephala var. veneta (Kützing) Rabenhorst, 1864
- Species Navicula pumilio Ehrenberg, 1841 †
- Species Navicula punctata (Kützing) Donkin, 1871 accepted as Aneumastus tuscula (Ehrenberg) D.G.Mann & A.J.Stickle, 1990 †
- Species Navicula punctata W. Arnott in litt. ex Brébisson, 1870
- Species Navicula punctata O'Meara, 1872
- Species Navicula punctatula
- Species Navicula puncticulata Skvortzov, 1976
- Species Navicula punctifera Hustedt, 1952 accepted as Geissleria punctifera (Hustedt) Metzeltin, Lange-Bertalot & García-Rodríguez, 2005
- Species Navicula punctigera Hustedt, 1955
- Species Navicula punctulata W.Smith, 1853
- Species Navicula punctulata Ehrenberg, 1842
- Species Navicula pungens Cleve-Euler, 1953
- Species Navicula pupilla Manguin in Bourrelly & Manguin, 1952
- Species Navicula pupula Kützing, 1844 accepted as Sellaphora pupula (Kützing) Mereschkovsky, 1902
- Species Navicula pupula Bristol, 1920
- Species Navicula pupula Bristol, 1920
- Species Navicula pupula Bristol, 1920
- Species Navicula pupuloides Cholnoky, 1955
- Species Navicula pupuloides Guermeur, 1954
- Species Navicula puschii Missuna, 1914
- Species Navicula pusilla W.Smith, 1853 accepted as Cosmioneis pusilla (W.Smith) D.G.Mann & A.J.Stickle, 1990
- Species Navicula pusilla sensu Donkin, 1870
- Species Navicula pusilla sensu Donkin, 1870
- Species Navicula pusilloides Compère, 1967
- Species Navicula pusio Cleve, 1859 accepted as Cavinula pusio (Cleve) Lange-Bertalot, 2004
- Species Navicula pusio sensu Mayer, 1919
- Species Navicula pusioides Foged, 1981
- Species Navicula pygmaea Kützing, 1849
- Species Navicula pygmaea (Ehrenberg) Pantocsek, 1902 accepted as Pinnularia pygmaea Ehrenberg, 1854
- Species Navicula pygmaea Frenguelli, 1923
- Species Navicula pygmaeformis Kobayasi, 1968
- Species Navicula pyrenaica W. Smith, 1857 (1858)
- Species Navicula quadrangulis H. Kobayasi, 1964
- Species Navicula quadrata Gregory, 1856
- Species Navicula quadratarea A.Schmidt, 1874 accepted as Pinnularia quadratarea (A.Schmidt) Cleve, 1895
- Species Navicula quadricostata Ehrenberg, 1838
- Species Navicula quadrifasciata Ehrenberg, 1840
- Species Navicula quadrilineata Grunow, 1879
- Species Navicula quadrimaculata Manguin, 1964
- Species Navicula quadripartita Hustedt, 1934
- Species Navicula quadripedis Cleve-Euler, 1952
- Species Navicula quadripuctata Hustedt, 1950
- Species Navicula quadriseriata Cleve & Grunow in Cleve, 1881
- Species Navicula quadrisinuata Quint in Hustedt, 1930
- Species Navicula quadrisulcata Grunow, 1867 (1870)
- Species Navicula quadriundulata Manguin, 1941
- Species Navicula quadriundulata Meister, 1932
- Species Navicula quadriundulata Hustedt in Schmidt et al., 1934
- Species Navicula quaesita Cholnoky, 1968
- Species Navicula quarnerensis Grunow
- Species Navicula quarnerensis Cleve accepted as Stauroneis quarnerensis Grunow ex Cleve, 1881
- Species Navicula quarnerensoides Hustedt, 1961
- Species Navicula quasidisjuncta Lange-Bertalot & U.Rumrich
- Species Navicula quaterna A. Berg, 1952
- Species Navicula quaternaria D.E. Kellogg, M. Stuiver, T.B. Kellogg & G.H. Denton, 1980
- Species Navicula quechua H. Lange-Bertalot & Rumrich in U. Rumrich, H. Lange-Bertalot & M. Rumrich, 2000
- Species Navicula quercyana Guermeur & Manguin, 1953
- Species Navicula quincunx Cleve, 1891
- Species Navicula quinquenodis Grunow, 1860
- Species Navicula quintiana Pantocsek & Greguss in Greguss, 1913
- Species Navicula quodest Cholnoky, 1960
- Species Navicula rabenhorstiana Hilse in Rabenhorst, 1859
- Species Navicula rabenhorstii Grunow, 1860 accepted as Pinnularia rabenhorstii (Grunow) K.Krammer, 2000
- Species Navicula rabenhorstii Ralfs in Pritchard, 1861
- Species Navicula radians Héribaud-Joseph, 1903 †
- Species Navicula radiata Leuduger-Fortmorel, 1892
- Species Navicula radiopunctata Hustedt in Schmidt et al., 1934
- Species Navicula radiosa Kützing, 1844
- Species Navicula radiosaeformis Manguin in Bourrelly & Manguin, 1952
- Species Navicula radiosafallax Lange-Bertalot, 1993
- Species Navicula radiosiola Lange-Bertalot, 1993
- Species Navicula radiostriata Hustedt, 1936
- Species Navicula raeana (Castracane) Cleve, 1895 accepted as Pinnularia raeana Castracane, 1886
- Species Navicula rainierensis Sovereign, 1963
- Species Navicula rajmundii A. Witkowski, H. Lange-Bertalot & D. Metzeltin, 2000
- Species Navicula rakowskae Lange-Bertalot, 2001
- Species Navicula ramingensis Handmann, 1913
- Species Navicula ramosissima (C.Agardh) Cleve, 1895
- Species Navicula ramosissimoides Gandhi, 1970
- Species Navicula ramphoides Pantocsek, 1889
- Species Navicula rancurellii Amossé, 1970
- Species Navicula rangoonensis (Grunow) Elmore, 1921 accepted as Pinnularia rangoonensis var. rangoonensis Grunow ex Cleve, 1895
- Species Navicula ranomafanensis (Manguin) D. Metzeltin & H. Lange-Bertalot, 2002 accepted as Navicula vulpina var. ranomafanensis Manguin, 1952
- Species Navicula rapsonii Cholnoky, 1959
- Species Navicula rara Ehrenberg, 1854
- Species Navicula rara Frenguelli, 1938
- Species Navicula rara Hustedt, 1934
- Species Navicula rarissima Bennett & Kociolek in Kociolek et al., 2014
- Species Navicula rasa Pantocsek, 1913
- Species Navicula rattrayi Pantocsek, 1889
- Species Navicula rauhii Manguin, 1964
- Species Navicula rautenbachiae Cholnoky, 1957
- Species Navicula ravinae Cholnoky, 1960
- Species Navicula recava Hohn & Hellerman, 1963
- Species Navicula recens (Lange-Bertalot) Lange-Bertalot, 1985 accepted as Navicula cari var. recens Lange-Bertalot, 1980
- Species Navicula recognita Torka, 1933
- Species Navicula recondita Hustedt, 1942
- Species Navicula recta Brun & Héribaud in Héribaud, 1893
- Species Navicula rectalineata Meister, 1934 (1935)
- Species Navicula rectangularis
- Species Navicula rectangulata Gregory, 1857
- Species Navicula rectum (Hustedt) F.W. Mills, 1934 accepted as Neidium rectum Hustedt, 1922
- Species Navicula recurva (Meister) A. Witkowski, H. Lange-Bertalot & D. Metzeltin, 2000 accepted as Navicula gracilis var. recurva Meister, 1937
- Species Navicula recurvata Gran, 1900
- Species Navicula regata Hanna & Grant, 1926
- Species Navicula regelii Krieger, 1944
- Species Navicula regressa Hustedt in Schmidt et al., 1934
- Species Navicula regula Grunow & Cleve
- Species Navicula regularis Hustedt
- Species Navicula reichardtiana Lange-Bertalot, 1989
- Species Navicula reichardtii Grunow, 1880
- Species Navicula reihardtii
- Species Navicula reimeri Gandhi, 1970
- Species Navicula reimeri Patrick & Freese, 1961
- Species Navicula reimerites VanLandingham, 1964
- Species Navicula reinhardti (Grunow) Grunow, 1880 accepted as Stauroneis reinhardtii Grunow, 1860
- Species Navicula reinhardtii (Grunow) Grunow in Van Heurck, 1880
- Species Navicula reinickeana Rabenhorst, 1859
- Species Navicula reissii Lee, Reimer & McEnery, 1980
- Species Navicula relicta McCall, 1933
- Species Navicula remota Grunow, 1880
- Species Navicula renauldi Héribaud-Joseph
- Species Navicula repentina Krasske, 1949
- Species Navicula resecta J.R.Carter, 1981
- Species Navicula reservata Cholnoky, 1968
- Species Navicula residua Schmidt in Schmidt et al., 1876
- Species Navicula restituta A.Schmidt ex Cleve & Moller, 1878
- Species Navicula reticulata Grunow, 1867
- Species Navicula reticulata Mereschkowsky, 1901
- Species Navicula reticuloradiata Tempère & Brun in Brun & Tempère, 1889
- Species Navicula retinenda Schmidt in Schmidt et al., 1897
- Species Navicula retracta Meister, 1937
- Species Navicula retrica Carter & Denny, 1982
- Species Navicula retrocurvata J.R.Carter ex R.Ross & P.A.Sims, 1978
- Species Navicula retrostauros Mann, 1925
- Species Navicula retusa Brébisson, 1883 accepted as Biremis ambigua (Cleve) D.G.Mann, 1990
- Species Navicula retusa H. Lange-Bertalot & K. Bonik, 1976
- Species Navicula retusa sensu Cleve & Grunow, 1880
- Species Navicula retusa sensu Van Heurck, 1885
- Species Navicula reusii Pantocsek, 1892
- Species Navicula reversa Hustedt, 1952 accepted as Placoneis reversa (Hustedt) H. Lange-Bertalot in D. Metzeltin, H. Lange-Bertalot & F. García-Rodríguez, 2005
- Species Navicula reversa Mann, 1925
- Species Navicula rhaphoneis (Ehrenberg) Ralfs, 1861 accepted as Pinnularia rhaphoneis Ehrenberg, 1854
- Species Navicula rhenana (Ehrenberg; Ehrenberg) De Toni, 1891 accepted as Pinnularia rhenana Ehrenberg, 1848
- Species Navicula rho Cleve, 1895
- Species Navicula rhodana M.H.Hohn & Hellerman, 1963
- Species Navicula rhombea Ehrenberg, 1843
- Species Navicula rhombica Gregory, 1855 †
- Species Navicula rhombica sensu Donkin, 1872
- Species Navicula rhombicula Hustedt, 1962
- Species Navicula rhombiformis Hustedt, 1944
- Species Navicula rhombiformis Gandhi, 1959 (1960)
- Species Navicula rhomboidea Castracane, 1878
- Species Navicula rhomboides Ehrenberg, 1843 accepted as Frustulia rhomboides (Ehrenberg) De Toni, 1891
- Species Navicula rhombulus Schumann, 1867
- Species Navicula rhombus Petit, 1877
- Species Navicula rhynchocephala Kützing, 1844
- Species Navicula rhynchocephaloides Hustedt in Schmidt et al., 1930
- Species Navicula rhynchocephaloides Frenguelli, 1941 accepted as Navicula rioplatensis Guerrero & Vouilloud, 2021
- Species Navicula rhynchotella Lange-Bertalot, 1993
- Species Navicula ricardae Lange-Bertalot, 2001 †
- Species Navicula ricardii Germain, 1981
- Species Navicula richardsoniana O'Meara, 1876
- Species Navicula ridelii Cleve-Euler, 1953
- Species Navicula riediana Lange-Bertalot & Rumrich, 2000
- Species Navicula rimosa Ehrenberg, 1838
- Species Navicula rimosa Greville, 1866
- Species Navicula riojae Cleve
- Species Navicula rioplatensis Guerrero & Vouilloud, 2021
- Species Navicula riotecensis Metzeltin & Lange-Bertalot, 1998
- Species Navicula ripageriensis Renault, 1903
- Species Navicula riparia Hustedt, 1942
- Species Navicula riparta Carter, 1966
- Species Navicula rivalis M.H.Hohn & Hellerman, 1963
- Species Navicula rivularis Hustedt, 1942
- Species Navicula rivulensis Patrick & Freese, 1961
- Species Navicula rivulorum H. Lange-Bertalot & Rumich in U. Rumrich, H. Lange-Bertalot & M. Rumrich, 2000
- Species Navicula robertsiana Greville, 1865 accepted as Lyrella robertsiana (Greville) D.G.Mann, 1990
- Species Navicula robertsii Patrick & Freese, 1961
- Species Navicula robertsoniana
- Species Navicula robusta Ehrenberg, 1840
- Species Navicula robusta Grunow, 1877
- Species Navicula robusta Pantocsek, 1889
- Species Navicula rogallii Hustedt, 1961
- Species Navicula rogersii Giffen, 1964
- Species Navicula rolandii Wunsam, Witkowski & Lange-Bertalot in Witkowski, Lange-Bertalot & Stachura, 1998
- Species Navicula romana (Rabenhorst) Ralfs in Pritchard, 1861 accepted as Falcatella romana Rabenhorst, 1853
- Species Navicula romanowii Pantocsek, 1902
- Species Navicula romanum Ehrenberg, 1854
- Species Navicula rosenbergii Østrup, 1910
- Species Navicula rossi Salah, 1955
- Species Navicula rossiana Mayer, 1931
- Species Navicula rostellaria Schmidt, 1874
- Species Navicula rostellata Kützing, 1844
- Species Navicula rostellata Schmidt accepted as Navicula crucifera Grunow, 1876
- Species Navicula rostellatia (Gregory) Schmidt, 1874 accepted as Navicula rostellaria Schmidt, 1874
- Species Navicula rostellifera O'Meara, 1876
- Species Navicula rostelloides Østrup, 1910
- Species Navicula rostellum W. Smith, 1856
- Species Navicula rostellum sensu Ostrup, 1895
- Species Navicula rostochiensis Heiden in Schmidt et al., 1903
- Species Navicula rostrata Ehrenberg, 1840
- Species Navicula rostrata W. Smith Ms., Gregory, 1856
- Species Navicula rostrata Frenguelli, 1929
- Species Navicula rotaeana (Rabenhorst) Grunow, 1880
- Species Navicula rotesta Carter, 1970
- Species Navicula rotula A.Cleve, 1953
- Species Navicula rotunda Hustedt, 1945
- Species Navicula rotunda Andrews, 1966
- Species Navicula rotundata (Ehrenberg) De Toni, 1891 accepted as Pinnularia rotundata Ehrenberg, 1854
- Species Navicula rotundata Hantzsch fide Grunow in Van Heurck, 1880
- Species Navicula rotundata Hantzsch in Rabenhorst, 1862
- Species Navicula rotundella Andrews, 1968
- Species Navicula rouxioidea Sheshukova-Poretskaya, 1967
- Species Navicula rovignensis Grunow in Cleve & Möller, 1879
- Species Navicula rudiformis Hustedt, 1964
- Species Navicula rudis Cleve
- Species Navicula rufisquiana Guermeur, 1954
- Species Navicula rugosa (Tempère & Brun) Schütt, 1896 accepted as Mastogloia rugosa Tempère & Brun in Brun & Tempère, 1889
- Species Navicula rugosa Janisch, 1888
- Species Navicula rugula M.H.Hohn & Hellerman, 1963
- Species Navicula rumaniensis Hustedt in Schmidt et al., 1934
- Species Navicula runtuensis Cholnoky, 1966
- Species Navicula rupestris O'Meara, 1876
- Species Navicula rupestris (Hantzsch) Schmidt, 1876 accepted as Pinnularia rupestris Hantzsch, 1861
- Species Navicula rupicola Hustedt, 1937
- Species Navicula rusticensis Lobban, 1984
- Species Navicula ruttneri Hustedt, 1937
- Species Navicula sabae (Ehrenberg) De Toni, 1891 accepted as Pinnularia sabae Ehrenberg, 1856
- Species Navicula sabiniana R.M.Patrick, 1959
- Species Navicula sacrophagus H.P. Gandhi, 1998 accepted as Navicula sacrophagus H.P.Gandhi ex Karthick, 2020
- Species Navicula sacrophagus H.P.Gandhi ex Karthick, 2020
- Species Navicula saeptata Jurilj, 1957
- Species Navicula safana Fusey, 1966
- Species Navicula sagitta (Cleve) Schütt, 1896 accepted as Stauroneis sagitta Cleve, 1881
- Species Navicula sagitta M.H.Hohn & Hellerman, 1963
- Species Navicula sahyadrensis Sarode & Kamat, 1984
- Species Navicula salaria Patrick & Freese, 1961
- Species Navicula salebrosa Cholnoky, 1963
- Species Navicula salina (W.Smith) Schütt, 1896 accepted as Stauroneis salina f. salina W. Smith, 1853
- Species Navicula salinaroides Cholnoky, 1963
- Species Navicula salinarum Grunow, 1880
- Species Navicula salinarum sensu Pantocsek, 1902
- Species Navicula salinicola Hustedt, 1939
- Species Navicula salsa Patrick & Freese, 1961
- Species Navicula salva Schmidt in Schmidt et al., 1876
- Species Navicula sambiensis Schumann, 1867
- Species Navicula samoensis Grunow, 1877
- Species Navicula samrai Salah, 1955
- Species Navicula sanctaecrucis Østrup, 1913
- Species Navicula sancti caroli Pantocsek, 1902
- Species Navicula sanctibenedicti Pantocsek, 1902
- Species Navicula sancti-naumii Z.Levkov & D.Metzeltin, 2007
- Species Navicula sanctinoberti Lacsny, 1917
- Species Navicula sanctithomae Cleve, 1878
- Species Navicula sandegrenii Cleve-Euler, 1922
- Species Navicula sandriana Grunow, 1863
- Species Navicula sandriana sensu Schmidt in Schmidt et al., 1881
- Species Navicula sansegana Grunow, 1875
- Species Navicula sansomei Foged, 1966
- Species Navicula santacrux Brun, 1896
- Species Navicula santapauii Suxena & Venkateswarlu, 1968
- Species Navicula sapeloensis Williams, 1962
- Species Navicula saprophila Lange-Bertalot & Bonik, 1976
- Species Navicula sarmatica Schljapina ex Makarova & Kozyrenko, 1966
- Species Navicula sarolata J.R.Carter & P.Denny, 1982
- Species Navicula satura Schmidt in Schmidt et al., 1876
- Species Navicula saugerri
- Species Navicula sauvis
- Species Navicula savannae Ehrenberg
- Species Navicula savannahiana Pantocsek, 1959 accepted as Dorofeyukea savannahiana (R.M.Patrick) Kulikovskiy & Kociolek in Kulikovskiy et al., 2019
- Species Navicula saxicola E.Manguin ex J.P.Kociolek & B.Reviers, 1996
- Species Navicula saxonica (Rabenhorst) Lagerstedt, 1873 accepted as Frustulia saxonica f. saxonica Rabenhorst, 1851
- Species Navicula saxophila W.Bock ex Hustedt, 1966
- Species Navicula scabellum Hustedt, 1942
- Species Navicula scabriuscula (Cleve & Grove in Cleve) Mereschkowsky, 1902 accepted as Amphora scabriuscula Cleve & Grove in Cleve, 1893
- Species Navicula scala Hohn & Hellerman, 1966
- Species Navicula scalarifer Brun, 1891
- Species Navicula scalaris (Ehrenberg) O'Meara, 1875 accepted as Stauroptera scalaris Ehrenberg, 1843
- Species Navicula scalpellum Kützing, 1849
- Species Navicula scalpia Carter, 1966
- Species Navicula scalprum Gaillon, 1827
- Species Navicula scalprum Ehrenberg, 1836
- Species Navicula scalprum Kützing, 1844
- Species Navicula scandinaviae Ehrenberg, 1875 (1876)
- Species Navicula scandinavica (Lagerstedt) Cleve, 1896 accepted as Stauroneis scandinavica Lagerst., 1876
- Species Navicula scaniae Van de Vijver, Jarlman & Lange-Bert., 2010
- Species Navicula scanica Cleve-Euler, 1952
- Species Navicula scela Carter & Denny, 1982
- Species Navicula schaarschmidtii Pantocsek, 1886
- Species Navicula schadei Krasske, 1929
- Species Navicula schadeiformis Foged, 1972
- Species Navicula schaeferi Hustedt, 1964
- Species Navicula schaferi Hustedt In Rabenhorst, 1964
- Species Navicula schefterae Lobban, 1986
- Species Navicula schilberszkyi Pantocsek
- Species Navicula schinzii Brun, 1891
- Species Navicula schiracka Skabichevskii, 1936
- Species Navicula schirschowii Seczkina, 1956
- Species Navicula schizonemoides Kisselev, 1930
- Species Navicula schleinitzii Janisch in Schmidt et al., 1881
- Species Navicula schliephackeana (Grunow in litt., Rabenhorst) M. Peragallo, 1903 accepted as Nitzschia schliephackeana Grunow ex Rabenhorst, 1864
- Species Navicula schmassmanni Hustedt, 1943 accepted as Humidophila schmassmannii (Hustedt, 1943) Buczkó & Wojtal, 2015
- Species Navicula schmassmanni Hustedt in Schmidt et al., 1934
- Species Navicula schmidti
- Species Navicula schmidtiana Grunow in Schmidt et al., 1876
- Species Navicula schmidtii Lagerst., 1876
- Species Navicula schmidtii (Cleve) Peragallo & Peragallo, 1897 accepted as Diploneis schmidtii Cleve, 1894
- Species Navicula schmidtii O'Meara, 1875
- Species Navicula schneideri Grunow, 1878
- Species Navicula schoemaniana Foged, 1975
- Species Navicula schoenfeldii Hustedt, 1930 accepted as Geissleria schoenfeldii (Hustedt) Lange-Bertalot & Metzeltin, 1996
- Species Navicula schomburgkii (Ehrenberg) Kützing, 1849 accepted as Pinnularia schomburgkii Ehrenberg, 1845
- Species Navicula schomburgkorum Ehrenberg, 1845
- Species Navicula schonfeldii Hustedt, 1930
- Species Navicula schonfeldtii
- Species Navicula schonkenii Hustedt, 1955
- Species Navicula schroeteri Meister, 1932
- Species Navicula schubartii Hustedt, 1952
- Species Navicula schuettii Van Heurck
- Species Navicula schultzei C.H.Kain
- Species Navicula schultzii
- Species Navicula schulzii Cleve, 1895
- Species Navicula schumanniana Grunow, 1880 accepted as Caloneis schumanniana (Grunow) Cleve, 1894
- Species Navicula schumannii Nathorst, 1894
- Species Navicula schuttii
- Species Navicula schwabei Krasske, 1939
- Species Navicula schweickerdtii Cholnoky, 1954
- Species Navicula schweinfurthi A.W.F.Schmidt, 1876
- Species Navicula scintillans Schmidt in Schmidt et al., 1881
- Species Navicula scintillans Tempère & Brun in Brun & Tempère, 1889
- Species Navicula scintillosa Manguin in Bourrelly & Manguin, 1949
- Species Navicula scirpus J.R.Carter, 1981
- Species Navicula scita W. Smith, 1857 (1858)
- Species Navicula scoliopleura Schmidt in Schmidt et al., 1876
- Species Navicula scoliopleuroides Quint in Hustedt, 1930
- Species Navicula scopulorioides Hustedt, 1961 accepted as Climaconeis scopulorioides (Hustedt) E.J.Cox, 1982
- Species Navicula scopulorum de Brébisson ex Kützing, 1849 accepted as Berkeleya scopulorum (Brébisson ex Kützing) E.J.Cox, 1979
- Species Navicula scopulorum sensu Cleve, 1894
- Species Navicula scoresbyi Foged, 1964
- Species Navicula scotica A.Schmidt, 1876
- Species Navicula scottiae Cholnoky & Claus, 1961
- Species Navicula sculpta Ehrenberg, 1854 accepted as Anomoeoneis sphaerophora var. sculpta (Ehrenberg) O.Müller, 1900
- Species Navicula scutelliformis
- Species Navicula scutelloides W.Smith, 1856
- Species Navicula scutellum (O'Meara) O'Meara, 1876 accepted as Pinnularia scutellum O'Meara, 1869
- Species Navicula scutiformis Grunow ex A.Schmidt et al., 1881 accepted as Cavinula scutiformis (Grunow ex A.Schmidt) D.G.Mann & A.J.Stickle, 1990
- Species Navicula scutula Hohn, 1961
- Species Navicula scutum Schumann, 1862
- Species Navicula scutum sensu Cleve-Euler in Backman & Cleve-Euler, 1922
- Species Navicula scythica Pantocsek, 1892
- Species Navicula secernenda A.W.F.Schmidt, 1876
- Species Navicula secreta Krasske ex Hustedt, 1934 † accepted as Navicula expecta S.L.VanLandingham, 1975 †
- Species Navicula secreta Pantocsek, 1902
- Species Navicula sectilis A.W.F.Schmidt
- Species Navicula secura R.M.Patrick, 1959
- Species Navicula seductilis A.Schmidt, 1874
- Species Navicula seibigiana Lange-Bertalot, 1993
- Species Navicula seibigii Lange-Bertalot, 1991
- Species Navicula seippiana Lange-Bertalot & Steindorf in Moser, Steindorf & Lange-Bertalot, 1995
- Species Navicula sejuncta A.Schmidt, 1874
- Species Navicula semen Ehrenberg, 1843
- Species Navicula semenoides Hustedt, 1927
- Species Navicula semiaperta Hustedt, 1936
- Species Navicula semiapproximata Hustedt, 1987 accepted as Lyrella semiapproximata (Hustedt) D.G.Mann, 1990
- Species Navicula semiarea Meister, 1934 (1935)
- Species Navicula semicruciata Ehrenberg, 1843
- Species Navicula semicruciata Schmidt, 1875 † accepted as Stauroptera semicruciata Ehrenberg, 1843
- Species Navicula semidecora Brun, 1896
- Species Navicula semidiversa Manguin ex Kociolek & Reviers, 1996
- Species Navicula semifasciata Østrup, 1918
- Species Navicula semihyalina Bock, 1970
- Species Navicula semiinflata Østrup, 1895
- Species Navicula semilyrata R.Simonsen, 1959
- Species Navicula seminoides Cleve & Grove, 1894
- Species Navicula seminuda Meister, 1937
- Species Navicula seminuda C. Jao & Y.Y. Lee in Jao, Zhu & Y.Y. Lee, 1974
- Species Navicula seminularia Cholnoky, 1966
- Species Navicula seminuloides Hustedt, 1937
- Species Navicula seminulum Grunow, 1860 accepted as Sellaphora seminulum (Grunow) D.G.Mann, 1989
- Species Navicula seminulum sensu Schumann, 1862 (1863)
- Species Navicula seminulum Ehrenberg, 1842
- Species Navicula semiplena (Gregory in Greville) Donkin, 1871 accepted as Pinnularia semiplena Greville, 1859
- Species Navicula semipronia Perty, 1852
- Species Navicula semipronia Perty, 1849
- Species Navicula semistauros Mann, 1925
- Species Navicula semistriata Østrup, 1895
- Species Navicula semitecta Schmidt, 1874
- Species Navicula semivirgata Krasske, 1929
- Species Navicula semota Schmidt in Schmidt et al., 1897
- Species Navicula senegalensis Ehrenberg, 1854
- Species Navicula senegalensis Guermeur, 1954
- Species Navicula senjoensis H. Kobayasi in Ando, Haraguchi & H. Kobayasi, 1971
- Species Navicula sennenii M. Peragallo in Heribaud et al., 1920
- Species Navicula senonquei M. Peragallo, 1921
- Species Navicula sentechii Diakonova-Savelieva, 1929
- Species Navicula sentelloides Smith
- Species Navicula separabilis Schmidt in Schmidt et al., 1875
- Species Navicula sepasiensis Foged, 1966
- Species Navicula seposita Hustedt, 1942
- Species Navicula septata Hustedt
- Species Navicula septata Proschkina-Lavrenko, 1963
- Species Navicula septataeoides Hustedt, 1966
- Species Navicula septenaria Bailey, 1862
- Species Navicula septentrionalis (Grunow) Gran, 1908
- Species Navicula septentrionalis Cleve, 1896
- Species Navicula septentrionalis Østrup, 1897
- Species Navicula septifera Proschkina-Lavrenko, 1967
- Species Navicula sequens H.G.Barber & J.R.Carter, 1971
- Species Navicula serdicensis H. Lange-Bertalot & D. Metzeltin, 2006
- Species Navicula serena Frenguelli, 1941 accepted as Witkowskia serena (Frenguelli) Kulikovskiy, Glushchenko, Mironov & Kociolek, 2024
- Species Navicula serians (Brébisson) Kützing, 1844 accepted as Brachysira serians (Brébisson) Round & D.G.Mann, 1981
- Species Navicula serica Schimanski, 1978
- Species Navicula sericea Cholnoky, 1961
- Species Navicula seriosa Pantocsek, 1892
- Species Navicula serpentina McCall, 1933
- Species Navicula serratula Grunow in Schmidt et al., 1875
- Species Navicula setacea (Kützing) Cleve, 1897 accepted as Micromega setaceum var. setaceum Kützing, 1844
- Species Navicula setanensis Okuno, 1959
- Species Navicula setschwanensis Skuja, 1937
- Species Navicula setzeri Patrick & Freese, 1961
- Species Navicula severascens Cholnoky, 1960
- Species Navicula severini Nicolucci, 1842
- Species Navicula shackletonii W.West & G.S.West, 1911
- Species Navicula shanwangensis J.-Y. Li, 1982 †
- Species Navicula shengxianensis Huang in Huang & Cai, 1984
- Species Navicula shiloi J.J. Lee, C.W. Reimer & M.E. McEnery, 1980
- Species Navicula siamensis Østrup, 1904
- Species Navicula sibayiensis Archibald, 1966 accepted as Pseudofallacia sibayiensis (R.E.M. Archibald) De Ridder & J.C. Taylor, 2020
- Species Navicula siberica Skvortzow, 1929
- Species Navicula sibirica Skvortzov, 1929
- Species Navicula sicula Ehrenberg, 1839
- Species Navicula sideralis Brun in Schmidt et al., 1892
- Species Navicula sieboldii Pantocsek, 1892
- Species Navicula sieminskiae Lange-Bertalot & Witkowski, 2001
- Species Navicula sigma Ehrenberg, 1833
- Species Navicula sigma Brun, 1891
- Species Navicula sigmaraphis Round, 1961
- Species Navicula sigmoidea (Nitzsch) Ehrenberg, 1832
- Species Navicula signata (Ehrenberg) Ralfs in Pritchard, 1861 accepted as Pinnularia signata Ehrenberg, 1854
- Species Navicula signatula Hustedt, 1964
- Species Navicula silenda Hohn, 1966
- Species Navicula silens Cholnoky, 1959
- Species Navicula silesiaca (Bleisch) H.L.Smith, 1876-1888 accepted as Pinnularia silesiaca Bleisch, 1862
- Species Navicula silicea Skvortzow, 1937
- Species Navicula silicina Kisselev, 1931
- Species Navicula silicula Ehrenberg, 1843
- Species Navicula silicula sensu Grunow in Van Heurck, 1880
- Species Navicula sillimanorum (Ehrenberg) Kützing, 1844 accepted as Pinnularia sillimanorum Ehrenberg, 1843
- Species Navicula silvahercynia Lange-Bertalot in Lange-Bertalot & Krammer, 1989
- Species Navicula silvatica Cholnoky, 1959
- Species Navicula silvestrina Zanon, 1949
- Species Navicula silvicola Cholnoky, 1966
- Species Navicula sima Ehrenberg, 1845
- Species Navicula simbirskiana Pantocsek, 1889
- Species Navicula simiaevultus Brun, 1891
- Species Navicula similis Krasske, 1929 accepted as Geissleria similis (Krasske) Lange-Bertalot & Metzeltin, 1996
- Species Navicula simonii Heiden
- Species Navicula simplex Krasske, 1925 accepted as Craticula simplex (Krasske, 1925) Levkov, 2017
- Species Navicula simplex Meister, 1937
- Species Navicula simplexoides H.P. Gandhi, 1998 accepted as Navicula simplexoides H.P.Gandhi ex Karthick, 2020
- Species Navicula simplexoides H.P.Gandhi ex Karthick, 2020
- Species Navicula simplus Meister, 1937
- Species Navicula simula Patrick, 1959
- Species Navicula simulans Donkin, 1873
- Species Navicula simulata Manguin, 1942
- Species Navicula simulator Mann, 1925
- Species Navicula sinensis Ehrenberg, 1847
- Species Navicula singularis Maillard, 1978
- Species Navicula singularis Schmidt, 1876
- Species Navicula sinicomeniscus Li & Metzeltin in Xiao et al., 2023
- Species Navicula sinuata Schumann, 1867
- Species Navicula sinuiraphe Patrick & Freese, 1961
- Species Navicula sinuosa Ehrenberg, 1840
- Species Navicula siofokensis Pantocsek, 1902
- Species Navicula siofokensis sensu Fontell in Man., Cleve-Euler, 1953
- Species Navicula siolii Hustedt, 1952
- Species Navicula sipanguelensis Li, 1983
- Species Navicula sirokiana (Ehrenberg) De Toni, 1891 accepted as Pinnularia sirokiana Ehrenberg, 1856
- Species Navicula sitiens Cholnoky, 1966
- Species Navicula sjoersii S.Busse & P.Snoeijs, 2002
- Species Navicula skabitschewsky
- Species Navicula skalenastriata Hohn, 1961
- Species Navicula sketechiensis Foged, 1966
- Species Navicula skiftei Foged, 1964
- Species Navicula skuae S.Alfinito & P.Cavacini, 2000 accepted as Navicula shackletonii W.West & G.S.West, 1911
- Species Navicula skvortzowii Karajeva, 1971
- Species Navicula sleensis Simonsen, 1959
- Species Navicula slesvicensis Grunow, 1880
- Species Navicula smeerenburgensis Foged, 1964
- Species Navicula smithiana Rabenhorst, 1868
- Species Navicula smithii Brébisson, 1854
- Species Navicula smithii (C.Agardh) Van Heurck, 1896 accepted as Schizonema smithii var. smithii Agardh, 1824
- Species Navicula smithii Brébisson, 1856 accepted as Diploneis smithii (Brébisson) Cleve, 1894
- Species Navicula smithii sensu Donkin, 1870
- Species Navicula smithii sensu Schmidt in Schmidt et al., 1875
- Species Navicula smithii sensu Van Heurck, 1880
- Species Navicula smithii (Grunow) Hustedt, 1909
- Species Navicula smolandica Cleve-Euler, 1953
- Species Navicula sniadeckii Missuna, 1914
- Species Navicula sobralensis Zimmermann, 1918
- Species Navicula sobria Cholnoky, 1963
- Species Navicula sobrina Mann, 1937
- Species Navicula socialis T.C.Palmer, 1910
- Species Navicula sodiroi (Schaarschmidt) De Toni, 1891 accepted as Pinnularia sodiroi Schaarschmidt, 1881
- Species Navicula soederlundii Cleve in Cleve & Moller, 1878
- Species Navicula soehrensis Krasske, 1923 accepted as Chamaepinnularia soehrensis (Krasske) Lange-Bertalot & Krammer, 1996
- Species Navicula sohrensis
- Species Navicula söhrensis Krasske
- Species Navicula solaris Gregory, 1856
- Species Navicula solaris Schmidt in Schmidt et al., 1876
- Species Navicula soleta Cholnoky, 1959
- Species Navicula solida Cleve in Cleve & Grunow, 1880
- Species Navicula solitaria Cleve, 1896
- Species Navicula soluta Frenguelli, 1941
- Species Navicula soluta Cholnoky, 1968
- Species Navicula solutepunctata Hustedt, 1939
- Species Navicula solutina Schoeman in Schoeman & Meaton, 1982
- Species Navicula soochowensis Skvortzow, 1946
- Species Navicula soodensis Krasske, 1927
- Species Navicula sorella M.H.Hohn & Hellerman, 1963
- Species Navicula sorriensis Foged, 1966
- Species Navicula sovereignae Hustedt, 1955
- Species Navicula sovereignii L.L.Bahls, 2011
- Species Navicula sovereignoides Stone in McLaughlin & Stone, 1986
- Species Navicula sparsipunctata Grove & Sturt, 1886
- Species Navicula sparsistriata Hustedt, 1964
- Species Navicula spartinetensis Sullivan & Reimer, 1975
- Species Navicula spathifera Grove & Sturt in litt. Grunow, 1888
- Species Navicula spathula Brun, 1891
- Species Navicula spatiata Østrup, 1918
- Species Navicula speciosa Mann, 1907
- Species Navicula speciosa Hustedt, 1913
- Species Navicula spectabilis Gregory, 1857
- Species Navicula spectabilis Grunow, 1860
- Species Navicula spectabilis Greville in A. Schmidt, 1874
- Species Navicula spectataissima Greville, 1866
- Species Navicula spectrum Manguin, 1952
- Species Navicula specululum Witkowski, 1994
- Species Navicula speibonae Giffen, 1970
- Species Navicula spencerii Bailey ex Quekett, 1848
- Species Navicula sperkiana Reinhard, 1870
- Species Navicula sphaerocephala Cleve-Euler, 1953
- Species Navicula sphaerophora Ehrenberg, 1843
- Species Navicula sphaerophora sensu Donkin, 1871
- Species Navicula sphaerophora Geitler, 1927
- Species Navicula sphagnicola Fusey, 1948
- Species Navicula sphagnophila Krasske, 1948
- Species Navicula spicoides Fusey, 1951
- Species Navicula spicula (Hickie) Cleve, 1894 accepted as Haslea spicula (Hickie) L.Bukhtiyarova, 1995
- Species Navicula spiculifera A. Mann, 1925
- Species Navicula spina
- Species Navicula spinifera W.Bock, 1970
- Species Navicula spiralis O'Meara, 1872
- Species Navicula spirans Hustedt, 1934
- Species Navicula spirata Hustedt, 1937
- Species Navicula spissata Manguin in Bourrelly & Manguin, 1954
- Species Navicula spitsbergensis (Cleve) Peragallo, 1903 accepted as Pinnularia spitsbergensis Cleve, 1895
- Species Navicula splendens Schwartz in Rabenhorst, 1877
- Species Navicula splendicula Van Landingham, 1975
- Species Navicula splendida Gregory, 1856 accepted as Diploneis splendida Cleve, 1894
- Species Navicula splendida Ehrenberg, 1832
- Species Navicula splendidula Hustedt & Krasske, 1949 accepted as Muelleria splendidula (Hustedt & Krasske) S.A.Spaulding & E.F.Stoermer, 1997
- Species Navicula sponsa J.R.Carter, 1964
- Species Navicula sponsalia Giffen, 1971
- Species Navicula spuma Mann, 1907
- Species Navicula spuria Cleve, 1896
- Species Navicula st. thomae Cleve, 1878
- Species Navicula stabilis F. Adams collection, 1934
- Species Navicula stachurae A. Witkowski, H. Lange-Bertalot & D. Metzeltin, 2000
- Species Navicula stagnalis Skvortzov, 1937
- Species Navicula staminea Cholnoky, 1968
- Species Navicula standeri Cholnoky, 1957
- Species Navicula standeriella Archibald, 1966
- Species Navicula stankovici Hustedt, 1945
- Species Navicula starmachii A.Witkowski & Lange-Bertalot
- Species Navicula starmachii Kaczmarska, 1976
- Species Navicula starmachioides A. Witkowski & H. Lange-Bertalot in D. Metzeltin & A. Witkowski, 1996
- Species Navicula stauntonii Grunow, 1882 accepted as Alloioneis stauntonii Grunow, 1882
- Species Navicula staurifera Thomas, 1886
- Species Navicula stauroneiformis Leuduger-Fortmorel, 1892
- Species Navicula stauroneiformis Elmore, 1921
- Species Navicula stauroneiformis Manguin, 1949
- Species Navicula stauroneiformis M. Peragallo, 1921
- Species Navicula stauroneiformis Wolle, 1890
- Species Navicula stauroptera Grunow, 1860 accepted as Pinnularia gibba Ehrenberg, 1843
- Species Navicula stauroptera (J.W. Bailey) Peragallo & Peragallo, 1897-1908 accepted as Amphora stauroptera J.W.Bailey, 1854
- Species Navicula stauroptera Schumann, 1867
- Species Navicula stauropteroides F.E.Fritsch, 1912
- Species Navicula stehlei Manguin in Bourrelly & Manguin, 1952
- Species Navicula stelligera (Ehrenberg) Kützing, 1849 accepted as Pinnularia stelligera Ehrenberg, 1845
- Species Navicula stephanssoni Foged, 1974
- Species Navicula stercusmuscarum Cleve, 1895
- Species Navicula steuropleura
- Species Navicula stigmata Frenguelli, 1941
- Species Navicula stigmata Rich, 1937
- Species Navicula stigmatifera J.John, 1981
- Species Navicula stippi Hanna & Grant, 1926
- Species Navicula stodderi (Greenleaf) Cleve, 1894 accepted as Stauroneis stodderi Greenleaf, 1865
- Species Navicula stoermeri Kociolek & Reviers, 1996
- Species Navicula stokesiana O'Meara, 1876
- Species Navicula stolida Krasske, 1939 accepted as Achnanthes stolida (Krasske) Krasske, 1949
- Species Navicula stomatophora Grunow, 1876 accepted as Pinnularia stomatophora (Grunow) Cleve, 1895
- Species Navicula stompsii Cholnoky, 1963
- Species Navicula stradneri Hajós, 1974
- Species Navicula strangulata Greville, 1866
- Species Navicula streckerae Lange-Bertalot & Witkowski, 2000
- Species Navicula strenzkei Hustedt, 1962
- Species Navicula streptoraphe (Cleve) M.Peragallo, 1903 accepted as Pinnularia streptoraphe Cleve, 1891
- Species Navicula striata Filarszky, 1900
- Species Navicula striata (Ehrenberg) De Toni, 1891 accepted as Pinnularia striata Ehrenberg, 1856
- Species Navicula striatula (Turpin) Ehrenberg, 1832 accepted as Surirella striatula f. striatula Turpin, 1816-1829 (1828)
- Species Navicula striola Prudent, 1907
- Species Navicula striolata (Grunow) Lange-Bertalot, 1985
- Species Navicula stroemii Hustedt, 1931
- Species Navicula stroemii sensu Foged, 1958
- Species Navicula stroesei (Østrup) A.Cleve, 1922 accepted as Aneumastus stroesei (Østrup) D.G.Mann, 1990
- Species Navicula strösei (Østrup) Cleve-Euler, 1922 accepted as Navicula tuscula var. stroesei Østrup, 1910
- Species Navicula structa Lange-Bertalot & Steindorf in Moser, Steindorf & Lange-Bertalot, 1995
- Species Navicula struggeri Cholnoky, 1963
- Species Navicula stundlii Hustedt, 1959
- Species Navicula stuxbergii Cleve
- Species Navicula stygia Cleve-Euler, 1934
- Species Navicula styliformis (Ehrenberg) Ralfs accepted as Pinnularia styliformis Ehrenberg, 1843
- Species Navicula stylus Ehrenberg, 1842
- Species Navicula styriaca Grunow, 1880
- Species Navicula styriaca Pantocsek, 1892
- Species Navicula suavis Cleve & Grove, 1894
- Species Navicula subacuta (Ehrenberg) Ralfs, 1861
- Species Navicula subacutis Foged, 1971
- Species Navicula subadnata Hustedt, 1942
- Species Navicula subagnita Proschkina-Lavrenko, 1963
- Species Navicula subagrestis Guermeur, 1954
- Species Navicula subalata Grunow in Cleve & Grunow, 1880
- Species Navicula subalpina Reichardt, 1988
- Species Navicula subampliata (Grunow in Schmidt et al.) De Toni, 1891 accepted as Navicula firma var. subampliata Grunow, 1877
- Species Navicula subantarctica Frenguelli, 1938
- Species Navicula subapiculata (Grunow in Cleve & Grunow) Hustedt, 1939 accepted as Navicula cancellata var. subapiculata Grunow in Cleve & Grunow, 1880
- Species Navicula subarvensis Hustedt, 1942
- Species Navicula subarvensoides Archibald, 1966
- Species Navicula subatomoides Hustedt, 1936
- Species Navicula subbacillum Hustedt, 1937
- Species Navicula subbengalensis Gandhi, 1970
- Species Navicula subbottnica A.Witkowski & Lange-Bertalot, 2009
- Species Navicula subcancellata Hustedt in Schmidt et al., 1934
- Species Navicula subcapitata (Gregory) Ralfs, 1861 accepted as Pinnularia subcapitata W.Gregory, 1856
- Species Navicula subcapitata (Østrup) Cleve-Euler, 1953 accepted as Navicula bacilliformis var. subcapitata Østrup, 1910
- Species Navicula subcarinata (Grunow ex A.Schmidt) Hendey, 1951 accepted as Navicula lyra f. subcarinata Grunow in Schmidt et al., 1874
- Species Navicula subcincta A.Schmidt, 1874
- Species Navicula subcincta Grunow, 1884
- Species Navicula subcingulata Cholnoky, 1963
- Species Navicula subclementis Hustedt, 1952 accepted as Witkowskia subclementis (Hustedt) Kulikovskiy, Glushchenko, Mironov & Kociolek, 2024
- Species Navicula subcoccus Cholnoky, 1960
- Species Navicula subcohaerens (Thwaites) Petit, 1877 accepted as Schizonema subcohaerens Thwaites, 1848
- Species Navicula subconcentrica Lange-Bertalot, 2001
- Species Navicula subconstricta (Ehrenberg) H.W. Reichardt, 1871 accepted as Pinnularia subconstricta Ehrenberg, 1862
- Species Navicula subcontenta Hustedt
- Species Navicula subcontenta Krieger, 1943
- Species Navicula subcontracta Cleve-Euler, 1953
- Species Navicula subconveniens Hustedt, 1952
- Species Navicula subcostulata Hustedt, 1934 accepted as Hippodonta subcostulata (Hustedt) Lange-Bertalot, Metzeltin & Witkowski, 1996
- Species Navicula subcrassirostris Hustedt, 1961
- Species Navicula subcreta Frenguelli, 1941
- Species Navicula subcuneata Østrup, 1910
- Species Navicula subdapaliformis Gandhi, 1970
- Species Navicula subdecipiens De Toni, 1891
- Species Navicula subdecussis Hustedt, 1942
- Species Navicula subdeliberata Manguin, 1964
- Species Navicula subdelicata Hustedt in Schmidt et al., 1934
- Species Navicula subdicephala Hustedt
- Species Navicula subdiffusa Hustedt, 1955
- Species Navicula subdigna Gandhi, 1970
- Species Navicula subdilucida Cholnoky, 1959
- Species Navicula subdirecta Cleve-Euler, 1953
- Species Navicula subdita Schmidt in Schmidt et al., 1897
- Species Navicula subdivisa Grunow in Cleve & Grunow, 1880
- Species Navicula subelata H.P.Gandhi, 1998
- Species Navicula subelliptica Cleve-Euler, 1953
- Species Navicula subelongata Skabichevskii, 1936
- Species Navicula subexilissima Carter, 1970
- Species Navicula subfasciata Pantocsek, 1912
- Species Navicula subfasciata Patrick, 1959
- Species Navicula subforcipata Hustedt, 1964
- Species Navicula subfortis Hustedt, 1954
- Species Navicula subfossalis Hustedt, 1934
- Species Navicula subfossilis Lichti-Federovich, 1980
- Species Navicula subfraudulenta Simonsen, 1987
- Species Navicula subfusca Pantocsek, 1892
- Species Navicula subgastriformis Hustedt, 1945
- Species Navicula subgastrum Hustedt in Schmidt et al., 1934
- Species Navicula subglabra Østrup, 1904
- Species Navicula subglobosa Gasse, 1980
- Species Navicula subgrimmei H.P. Gandhi, 1998 accepted as Navicula lacus-chandolensis Guiry & Karthick, 2020
- Species Navicula subgrimmei Messikommer, 1949
- Species Navicula subhalophila Hustedt, 1937 accepted as Craticula subhalophila (Hustedt) Lange-Bertalot, 1993
- Species Navicula subhamulata Grunow, 1880 accepted as Fallacia subhamulata (Grunow) D.G.Mann, 1990
- Species Navicula subhastatula Z.Levkov & D.Metzeltin, 2007
- Species Navicula subhexagona Hustedt in Schmidt et al., 1934
- Species Navicula subhustedtii Cholnoky, 1960
- Species Navicula subhyalina Cleve-Euler, 1934
- Species Navicula subimpressa Grunow
- Species Navicula subinflata Grunow, 1883
- Species Navicula subinflatoides Hustedt, 1962
- Species Navicula subinsoensis Foged, 1966
- Species Navicula subinvicta Krasske, 1939 accepted as Nupela subinvicta (Krasske) Lange-Bertalot in Lange-Bertalot & Moser, 1994
- Species Navicula subirritans Giffen, 1970
- Species Navicula subirroratoides Hustedt, 1964
- Species Navicula sub-kawamurae Skvortzow, 1971
- Species Navicula sub-kawamurae Skvortzow, 1971
- Species Navicula sublanceolata H.P. Gandhi, 1998 accepted as Navicula sublanceolata H.P.Gandhi ex Karthick, 2020
- Species Navicula sublanceolata H.P.Gandhi ex Karthick, 2020
- Species Navicula sublinearis Grunow, 1885
- Species Navicula sublucidula Hustedt, 1950
- Species Navicula sublyrata Grunow in Cleve, 1883
- Species Navicula subminuscula Manguin, 1942
- Species Navicula subminuscula (Skvortzov, 2012)
- Species Navicula submissa Zimmermann, 1918
- Species Navicula submitis Hustedt, 1945
- Species Navicula submolesta Hustedt, 1949
- Species Navicula submuralis Hustedt, 1945
- Species Navicula submuscicola Krasske, 1939
- Species Navicula submutica Fusey, 1964
- Species Navicula submuticoides N.Woodhead & R.D.Tweed, 1958
- Species Navicula subnuda A.W.F.Schmidt
- Species Navicula subnympharum Hustedt in Schmidt et al., 1936
- Species Navicula subocculta Hustedt
- Species Navicula suborbicularis (Gregory) Donkin, 1870 accepted as Navicula smithii var. suborbicularis Gregory, 1857
- Species Navicula suboscitans Mann, 1925
- Species Navicula subovalis (Cleve) Mann, 1924 accepted as Diploneis subovalis Cleve, 1894
- Species Navicula subparallela
- Species Navicula subpatrickae Archibald, 1966 accepted as Cavinula subpatrickae (R.E.M. Archibald) De Ridder & J.C. Taylor, 2020
- Species Navicula subplacentula Hustedt, 1930
- Species Navicula subpolaris Hendey, 1937
- Species Navicula subprocera Hustedt, 1945
- Species Navicula subpupula Woodhead & Tweed, 1960
- Species Navicula subquadrata Schumann, 1867
- Species Navicula subradiosa Pantocsek
- Species Navicula subrecta Brébisson
- Species Navicula subretusa Grunow, 1885
- Species Navicula subretusa Peragallo & Peragallo, 1897-1908
- Species Navicula subrhombica Hustedt, 1922
- Species Navicula subrhombica Marsson, 1900
- Species Navicula subrhomboidea Castracane, 1886
- Species Navicula subrhynchocephala Hustedt, 1935
- Species Navicula subrostellata Hustedt, 1955
- Species Navicula subrotunda Schumann
- Species Navicula subrotundata Hustedt
- Species Navicula subsalina Donkin, 1870 accepted as Caloneis amphisbaena var. subsalina (Donkin) Cleve, 1894
- Species Navicula subsalsa Mereschkowsky, 1903
- Species Navicula subseminulum Hustedt, 1950
- Species Navicula subsolaris Grunow, 1882 accepted as Pinnularia decrescens (Grunow) K.Krammer, 2000
- Species Navicula subspectablis Hanna & Grant, 1926
- Species Navicula substauroneis Mann, 1925
- Species Navicula subsulcata Hustedt in Schmidt et al., 1936
- Species Navicula subsulcatoides Hustedt, 1987
- Species Navicula subtenelloides Cholnoky, 1958
- Species Navicula subtenuis Cleve-Euler, 1948
- Species Navicula subtilacea Cholnoky, 1960
- Species Navicula subtilis Brebisson in Kutzing, 1849
- Species Navicula subtilis (Gregory) Ralfs
- Species Navicula subtilissima Cleve, 1891
- Species Navicula subtilyra Cholnoky, 1963
- Species Navicula subtrophicatrix A.Tuji, 2003
- Species Navicula subula Grunow, 1860 accepted as
- Species Navicula subula Kützing, 1844
- Species Navicula subulata Grunow
- Species Navicula subundulata Cleve & Grove, 1891
- Species Navicula subundulata (Grunow) F.W.Mills, 1934 accepted as Navicula firma var. subundulata Grunow ex A.Schmidt et al., 1877
- Species Navicula subvalida Cholnoky, 1960
- Species Navicula subvasta Hustedt, 1935
- Species Navicula subvasta Carter, 1970
- Species Navicula subveneta Cleve-Euler, 1934
- Species Navicula subventraloides Guermeur, 1954
- Species Navicula subventricosa Grunow in Cleve & Grunow, 1880
- Species Navicula subviridula Z.Levkov, 2011
- Species Navicula subvitabunda Cholnoky, 1956
- Species Navicula subvulpina Hustedt
- Species Navicula subwalkeri Bahls & Potapova, 2015
- Species Navicula succincta Schmidt in Schmidt et al., 1881
- Species Navicula suchlandtii Hustedt, 1943
- Species Navicula suchlandtii sensu Krasske, 1949
- Species Navicula suchlandtii sensu Foged, 1958
- Species Navicula sudanensis Bastow, 1960
- Species Navicula sudetica Hilse, 1860 accepted as Pinnularia sudetica (Hilse) Hilse, 1861
- Species Navicula sudora Schrader & Fenner, 1976
- Species Navicula suecica Ehrenberg, 1838
- Species Navicula suecicarum Van de Vijver, Jarlman & Lange-Bert. in Van de Vijver & Lange-Bertalot, 2009
- Species Navicula suecorum Carlson, 1913 accepted as Luticola suecorum (Carlson) Van de Vijver in Van de Vijver & Mataloni, 2008
- Species Navicula suffocata Mann, 1925
- Species Navicula suhinensis Foged, 1966
- Species Navicula sukatschevii Yakovlev, 1924
- Species Navicula sulcata Greville, 1865
- Species Navicula sulcata sensu Schmidt in Schmidt et al., 1897
- Species Navicula sulcata (Cleve) Cleve, 1894 accepted as Stauroneis sulcata Cleve, 1881
- Species Navicula sulcifera Hustedt, 1955
- Species Navicula sulphurea J.Frenguelli & H.A.Orlando, 1958
- Species Navicula sulta Carter & Denny, 1982
- Species Navicula suluensis O'Meara, 1872
- Species Navicula sumatrensis Leuduger-Fortmorel, 1892
- Species Navicula sunkonensis N.Woodhead & R.D.Tweed, 1958
- Species Navicula superba Cleve
- Species Navicula supercilliaris Cholnoky, 1963
- Species Navicula supercontenta Cleve-Euler, 1948
- Species Navicula supergradata Brun, 1891
- Species Navicula supergregaria Rumrich & H. Lange-Bertalot in U. Rumrich, H. Lange-Bertalot & M. Rumrich, 2000
- Species Navicula superhasta Lange-Bertalot & D.Metzeltin, 2006
- Species Navicula superimposita Schmidt, 1874
- Species Navicula supleeorum L.Bahls, 2013
- Species Navicula supralitoralis Aleem & Hustedt, 1951
- Species Navicula suprinii Gerd Moser
- Species Navicula suriana Pantocsek & Greguss in Greguss, 1913
- Species Navicula surinamensis Cleve, 1895
- Species Navicula surirella Ehrenberg, 1881
- Species Navicula surirellae Zanon, 1949
- Species Navicula suspecta A.W.F.Schmidt
- Species Navicula suspica Carter & Denny, 1992
- Species Navicula suspirii Cholnoky, 1961
- Species Navicula sverdrupii Foged, 1964
- Species Navicula swaniana Moghadam, 1969
- Species Navicula swaniana Moghadam, 1969
- Species Navicula sydowii Cholnoky, 1963
- Species Navicula symmetrica Patrick, 1944
- Species Navicula syrachii Foged, 1966
- Species Navicula syvertsenii Witkowski, Metzeltin & Lange-Bertalot in Metzeltin & Witkowski, 1996
- Species Navicula szaboi Pantocsek, 1889
- Species Navicula szlachetkoi A.Witkowski, C.Riaux-Gobin & G.Daniszewska-Kowalczyk, 2010
- Species Navicula szontaghii Pantocsek, 1886
- Species Navicula szontaghii sensu Peragallo & Peragallo, 1897
- Species Navicula tabellaria (Ehrenberg) Kützing, 1844
- Species Navicula tabellaria sensu Donkin, 1872
- Species Navicula tabellariaeformis Krasske, 1939 accepted as Humidophila tabellariaeformis (Krasske) Lowe, Kociolek, Johansen, Van de Vijver, Lange-Bertalot & Kopalová, 2014
- Species Navicula tabida Rylands Ms. ex Van Heurck, 1880
- Species Navicula tackei Hustedt, 1942
- Species Navicula taedens Cholnoky, 1968
- Species Navicula taeniata (Ehrenberg) Ralfs in Pritchard, 1861 accepted as Pinnularia taeniata Ehrenberg, 1849
- Species Navicula tagiana Patrick, 1970
- Species Navicula tahitensis Grunow, 1863
- Species Navicula tainensis Foged, 1966
- Species Navicula tairuaensis Foged, 1979
- Species Navicula taishanica Guo & Xie, 1994 accepted as
- Species Navicula takoradiensis Hendey, 1958
- Species Navicula tamanaena Guermeur, 1954
- Species Navicula tamanica Milovanova, 1955
- Species Navicula tambourense M. Peragallo in Héribaud et al., 1920
- Species Navicula tanakae H. Fukushima, T. Ko-Bayashi & S. Yoshitake, 2002
- Species Navicula tanganyikae G.S.West, 1907
- Species Navicula tanneri Cleve-Euler, 1934
- Species Navicula tantula Hustedt, 1943
- Species Navicula tantuloides Cholnoky, 1960
- Species Navicula taraxa Hohn & Hellerman, 1966
- Species Navicula taschenbergeri Schmidt in Schmidt et al., 1892
- Species Navicula tau Cleve, 1893
- Species Navicula tauta Carter & Denny, 1982
- Species Navicula taylori Salah, 1955
- Species Navicula tecta Krasske ex Hustedt, 1934 † accepted as Geissleria tectissima (Lange-Bertalot) Lange-Bertalot, 1996 †
- Species Navicula tecta Marsson, 1900
- Species Navicula tectissima Lange-Bertalot, 1996 †
- Species Navicula teleta Hohn, 1966
- Species Navicula teletskoyensis Chudaev
- Species Navicula temeraria Cholnoky, 1965
- Species Navicula temniskovae H. Lange-Bertalot & D. Metzeltin, 2006
- Species Navicula temperei Brun in Brun & Tempère, 1889
- Species Navicula temperiana De Toni, 1891
- Species Navicula tenella Brébisson ex Kützing, 1849 accepted as Navicula cryptotenella Lange-Bertalot, 1985
- Species Navicula tenella sensu Schmidt in Schmidt te al., 1876
- Species Navicula tenellaeformis Hustedt, 1937
- Species Navicula tenelloides Hustedt, 1937
- Species Navicula tenellum (Mayer) F.W. Mills, 1934 accepted as Neidium tenellum Mayer, 1919
- Species Navicula tenera Hustedt, 1937
- Species Navicula tenera Hustedt, 1936
- Species Navicula teneroides Hustedt, 1956
- Species Navicula tenerrima Hustedt, 1937
- Species Navicula tennellaeformis Hustedt, 1937
- Species Navicula tennelloides
- Species Navicula tentata Cholnoky, 1966
- Species Navicula tenuicephala Hustedt, 1942 accepted as Nupela tenuicephala (Hustedt) Lange-Bertalot, 1993
- Species Navicula tenuipunctata Hustedt, 1959 accepted as Dorofeyukea tenuipunctata (Hustedt) Kulikovskiy & Kociolek in Kulikovskiy et al., 2019
- Species Navicula tenuirostris O'Meara, 1876
- Species Navicula tenuis Krasske, 1939 accepted as Adlafia tenuis Van de Vijver & Goeyers, 2019
- Species Navicula tenuis Meister, 1937
- Species Navicula tenuis (Agardh) Cleve-Euler, 1953 accepted as Schizonema tenuissimum Kützing, 1844
- Species Navicula tenuissima Archibald, 1971
- Species Navicula tenuistriata (Cleve) Ross, 1972 accepted as Navicula hennedyi var. tenuistriata Cleve, 1895
- Species Navicula terebrata Hustedt, 1944
- Species Navicula termes Ehrenberg
- Species Navicula termes sensu Schmidt in Schmidt et al., 1876
- Species Navicula terminata Hustedt, 1964
- Species Navicula termitina Ehrenberg, 1854 accepted as Pinnularia termitina (Ehrenberg) R.M.Patrick, 1966
- Species Navicula terrestris J.B.Petersen, 1915 accepted as Muelleria terrestris (J.B.Petersen) S.A.Spaulding & E.F.Stoermer, 1997
- Species Navicula terricola Bristol, 1920
- Species Navicula tersa Hustedt, 1956
- Species Navicula teschi Reinhold, 1937
- Species Navicula testata Hustedt, 1942
- Species Navicula testudo Ehrenberg, 1840
- Species Navicula texana R.M.Patrick, 1959
- Species Navicula thaitiana Castracane, 1886
- Species Navicula thallodes Proschkina-Lavrenko, 1955
- Species Navicula theelii Cleve in Cleve & Grunow, 1880
- Species Navicula theibaudii M. Peragallo, 1924
- Species Navicula theresiae Pantocsek, 1909
- Species Navicula thermalis Ehrenberg, 1840
- Species Navicula thermalis De Toni, 1891
- Species Navicula thermes Elmore, 1921
- Species Navicula thermicola J.B.Petersen, 1928
- Species Navicula thermophila Manguin in Bourrelly & Manguin, 1952 accepted as Chamaepinnularia thermophila (Manguin) C.E. Wetzel & Ector, 2016
- Species Navicula theronii Cholnoky, 1954
- Species Navicula theta Cleve, 1893
- Species Navicula thienemanni Hustedt, 1937
- Species Navicula thienemannioides Gandhi, 1970
- Species Navicula thienemannoides Cholnoky, 1952
- Species Navicula thingvallae Østrup, 1918 †
- Species Navicula thomasii Schumann, 1862
- Species Navicula thomasii Hancock, 1973
- Species Navicula thorax Brun, 1891
- Species Navicula thoroddseni Foged, 1974
- Species Navicula thouleti Lauby, 1910
- Species Navicula thumii Pantocsek, 1886
- Species Navicula thumii (Cleve) Schütt, 1896 accepted as Dictyoneis thumii Cleve, 1890
- Species Navicula thurholmensis Juhlin-Dannfelt, 1882
- Species Navicula thuringiaca Rabenhorst, 1852
- Species Navicula thuringica Kützing, 1844
- Species Navicula thurstonensis Kaczmarska in Rushforth, Kaczmarska & Johansen, 1984 accepted as Nupela thurstonensis (Kaczmarska) M.Kulikovskiy, Lange-Bertalot & A.Witkowski, 2009
- Species Navicula tibestiensis Amossé, 1934
- Species Navicula tibetana (Hustedt) F.W. Mills, 1934 accepted as Pinnularia tibetana var. tibetana Hustedt, 1922
- Species Navicula tientsinensis Skvortzow, 1927
- Species Navicula tignaria Hustedt, 1942
- Species Navicula tithonia Pantocsek, 1902
- Species Navicula tokiensis Cleve-Euler, 1953
- Species Navicula tokyoensis Kobayashi, 1968
- Species Navicula tolmani Hanna, 1927
- Species Navicula tongatensis Hustedt, 1962 accepted as Chamaepinnularia thermophila (Manguin) C.E. Wetzel & Ector, 2016
- Species Navicula topia Pantocsek, 1902
- Species Navicula torellii Foged, 1964
- Species Navicula torganae D. Metzeltin, H. Lange-Bertalot & F. García-Rodríguez, 2005
- Species Navicula torifera Hustedt, 1955
- Species Navicula torneensis Cleve, 1891
- Species Navicula torpedo Zimmermann, 1918
- Species Navicula torquata (Harvey) Hustedt accepted as Schizonema smithii var. torquatum Harvey, 1841
- Species Navicula torrendi
- Species Navicula torta D.G.Mann, 1924
- Species Navicula tortuosa Ehrenberg, 1843
- Species Navicula tortuosa Leuduger-Fortmorel, 1879
- Species Navicula tortura Cholnoky, 1960
- Species Navicula totarae Schrader, 1969
- Species Navicula toulaae Pantocsek, 1892
- Species Navicula toulaae sensu Brockmann, 1950
- Species Navicula toulaae Østrup in Hartz & Østrup, 1899
- Species Navicula towutiensis Cholnoky, 1963
- Species Navicula toxa J.R.Carter, 1960
- Species Navicula trabecula Ehrenberg, 1843
- Species Navicula tracery M.H.Hohn & Hellerman, 1963
- Species Navicula tranchet Turpin, 1828
- Species Navicula transfuga Grunow ex Cleve, 1883 accepted as Petroneis transfuga (Grunow ex Cleve) D.G.Mann, 1990
- Species Navicula transistans
- Species Navicula transistantiodes Foged, 1975
- Species Navicula transitans Cleve, 1883
- Species Navicula translucens Mann, 1925
- Species Navicula translucida O'Meara, 1876
- Species Navicula transvaalensis (Cholnoky) Cholnoky, 1966 accepted as Navicula gastrum var. transvaalensis Cholnoky, 1958
- Species Navicula transversa Bory de Saint-Vincent, 1824
- Species Navicula transversa A.Schmidt, 1876
- Species Navicula transversa Turpin, 1828 (1816-1829)
- Species Navicula transylvanica Pantocsek
- Species Navicula traucilola Guermeur
- Species Navicula trevelyana Donkin, 1861 accepted as Pinnularia trevelyana (Donkin) Rabenhorst, 1864
- Species Navicula triangulifera Héribaud, 1903
- Species Navicula trichoptera Foged, 1952
- Species Navicula triconfusa VanLandingham, 1975
- Species Navicula tridens Meunier, 1910
- Species Navicula tridentula Krasske, 1923
- Species Navicula tridentulaeformis Manguin in Bourrelly & Manguin, 1949
- Species Navicula trigibba Lacsny, 1916
- Species Navicula trigibba Fresenius, 1862
- Species Navicula trigibbula Schumann, 1867
- Species Navicula trigomirae Moura, 1963
- Species Navicula trigonocephala (Cleve) M.Peragallo, 1903 accepted as Pinnularia trigonocephala f. trigonocephala Cleve, 1895
- Species Navicula trigonocephala (Ehrenberg) Ralfs, 1861 accepted as Pinnularia trigonocephala Ehrenberg, 1854
- Species Navicula trigramma Fresenius, 1862
- Species Navicula trigranula Marsson, 1900
- Species Navicula trilatera L.Bahls, 2013
- Species Navicula trilineata Grove & Sturt, 1887
- Species Navicula trinkleri Meister, 1932
- Species Navicula trinodis W.Smith, 1856
- Species Navicula trinodis Ehrenberg, 1837
- Species Navicula trinodis sensu Lewis, 1861
- Species Navicula trinotata Pantocsek, 1892
- Species Navicula tripartita Heiden
- Species Navicula triplex VanLandingham, 1975
- Species Navicula tripunctata (O.F.Müller) Bory de Saint-Vincent, 1822 accepted as Vibrio tripunctatus O.F.Müller, 1786
- Species Navicula tristis Krasske, 1939 accepted as Nupela tristis (Krasske) Lange-Bertalot in Lange-Bertalot & Moser, 1994
- Species Navicula tristitiae Schoeman, 1973
- Species Navicula tristriata Skvortzow, 1946
- Species Navicula trituberculata Prowse, 1962
- Species Navicula triundulata Grunow, 1867
- Species Navicula trivialis Lange-Bertalot, 1980
- Species Navicula trochus Ehrenberg, 1854
- Species Navicula trochus Schumann, 1863
- Species Navicula troglodytes Pantocsek, 1889
- Species Navicula trolopensis Frenguelli, 1942
- Species Navicula trompii Cleve, 1901 accepted as Haslea trompii (Cleve) Simonsen, 1974
- Species Navicula trophicatrix Lange-Bertalot, 1996
- Species Navicula trophicatrixoides Chudaev in Chudaev & Jüttner, 2020
- Species Navicula tropica Meister, 1934 (1935)
- Species Navicula tropicoidea Witkowski, Metzeltin & Lange-Bertalot in Metzeltin & Witkowski, 1996
- Species Navicula troyana (Grunow in Cleve & Möller) Cleve, 1895 accepted as Navicula stauroptera var. troiana Grunow in Cleve & Möller, 1879
- Species Navicula truanii Pantocsek, 1886
- Species Navicula truncata Kützing, 1844
- Species Navicula truncata Donkin, 1861
- Species Navicula truncata Cleve-Euler, 1915
- Species Navicula truncatula Hustedt, 1966
- Species Navicula trunculis Schumann, 1867
- Species Navicula trunculus Schumann, 1867
- Species Navicula truthi Pero, 1895
- Species Navicula tryblionella Yakovlev, 1923
- Species Navicula tschernyschevii Missuna, 1914
- Species Navicula tschuktschorum Cleve, 1883
- Species Navicula tsetsegmaae D. Metzeltin, H. Lange-Bertalot & S. Nergui, 2009
- Species Navicula tsitsikammae Cholnoky, 1959
- Species Navicula tsukamotoi (Sterrenburg & Hinz) Yuhang Li et Kuidong Xu in Li et al., 2017
- Species Navicula tubulata Østrup, 1901
- Species Navicula tubulifera Geissler & Gerloff, 1964
- Species Navicula tubulosa J.Brun, 1895
- Species Navicula tugelae Cholnoky, 1956
- Species Navicula tugtoi Foged, 1971
- Species Navicula tulugakii Foged, 1971
- Species Navicula tumens W.Smith, 1853
- Species Navicula tumescens Grunow in Schmidt et al., 1877
- Species Navicula tumescensoides Amossé, 1969
- Species Navicula tumida Brébisson ex Kützing
- Species Navicula tumida Brébisson ex Kützing, 1849 accepted as Metascolioneis tumida (Bréb. ex Kütz.) S.Blanco & C.E.Wetzel, 2016
- Species Navicula tumidula Rabenhorst, 1853
- Species Navicula turbulata Østrup, 1901
- Species Navicula turgescens Mann, 1925
- Species Navicula turgida Ehrenberg, 1830
- Species Navicula turgidula Pantocsek, 1892
- Species Navicula turkestanensis Hustedt, 1955
- Species Navicula turpinii Brebisson ex W. Smith Collection
- Species Navicula turriformis Y.Li et Metzeltin iin Li et al., 2020
- Species Navicula turris Hustedt ex Simonsen, 1987 †
- Species Navicula tuscula Ehrenberg, 1840 accepted as Aneumastus tuscula (Ehrenberg) D.G.Mann & A.J.Stickle, 1990 †
- Species Navicula tuscula (Ehrenberg) Grunow accepted as Aneumastus tuscula (Ehrenberg) D.G.Mann & A.J.Stickle, 1990 †
- Species Navicula tuscula sensu Grunow in Van Heurck, 1880
- Species Navicula tuscula sensu Van Heurck, 1880
- Species Navicula tuscula sensu Pantocsek, 1902
- Species Navicula tusculoides A.Cleve, 1953 accepted as Aneumastus tusculoides (A.Cleve) D.G.Mann, 1990
- Species Navicula tuulensis D. Metzeltin, H. Lange-Bertalot & S. Nergui, 2009
- Species Navicula tuzsoni Lacsny, 1916
- Species Navicula tuzsonii Lacsny, 1916
- Species Navicula twymaniana Archibald, 1966
- Species Navicula typografica Hustedt in Schmidt et al., 1930
- Species Navicula tytthocephala Skvortzov, 1976
- Species Navicula udintsevii Schrader & Fenner, 1976
- Species Navicula ulna (Nitzsch) Ehrenberg
- Species Navicula ultratenelloides Lange-Bertalot, 1996
- Species Navicula ulvacea (Berkeley) Cleve, 1894 accepted as Dickieia ulvacea Berkeley ex Kützing, 1844
- Species Navicula umbilica K.E. Lohman, 1957
- Species Navicula umbilicata Ehrenberg, 1856
- Species Navicula umbilicata Zimmermann, 1917
- Species Navicula umbilicata Grunow
- Species Navicula umbilicatissima Reichardt, 1983 †
- Species Navicula umbonata Ehrenberg, 1837
- Species Navicula umbra M.H.Hohn & Hellerman, 1963
- Species Navicula umida Bock, 1963
- Species Navicula umkantziensis Schoeman & Meaton
- Species Navicula umpatica Cholnoky, 1968
- Species Navicula umtalensis Cholnoky, 1954
- Species Navicula umtentwenica Cholnoky, 1960
- Species Navicula uncinata Ehrenberg, 1830
- Species Navicula undata Schumann in A. Schmidt, 1876
- Species Navicula undata Mann, 1907
- Species Navicula undosa Ehrenberg, 1843
- Species Navicula undosa sensu Donkin, 1871
- Species Navicula undosa sensu O'Meara, 1876
- Species Navicula undula Schumann, 1862 †
- Species Navicula undulata Ehrenberg, 1838 accepted as Surirella undulata (Ehrenberg) Ehrenberg, 1845
- Species Navicula undulata O'Meara, 1875
- Species Navicula undulata Skvortzov, 1936
- Species Navicula undulata Ralfs, 1861
- Species Navicula undulata (Grunow) Wolle, 1890 accepted as Navicula limosa var. undulata Grunow, 1880
- Species Navicula undulatistriata Manguin, 1954
- Species Navicula undulatostriata Gleser in Afanas'eva & Gleser, 1986
- Species Navicula ungavae Poulin & Cardinal, 1982
- Species Navicula unica Salah & Tamas, 1968
- Species Navicula unilaterarea Salah, 1953
- Species Navicula unipunctata Bory, 1831
- Species Navicula unipunctata O'Meara, 1872
- Species Navicula unipunctata Skvortzow, 1937
- Species Navicula uniseriata Østrup, 1913
- Species Navicula uniseriata Hustedt in Schmidt et al., 1934
- Species Navicula upsaliensis (Grunow) Peragallo, 1903 accepted as Navicula menisculus var. upsaliensis Grunow, 1880
- Species Navicula upupensis Cholnoky, 1966
- Species Navicula urbana Krasske, 1939 accepted as Veigaludwigia urbana (Krasske) Lange-Bertalot & U.Rumrich, 2007
- Species Navicula ursina Pantocsek, 1902
- Species Navicula ursinus Foged, 1971
- Species Navicula usoltsevae Metzeltin, Kulikovskiy & Lange-Bertalot, 2012
- Species Navicula uspenskiana Gleser & Scheschukova, 1968
- Species Navicula usutensis Cholnoky, 1962
- Species Navicula utahensis K.E. Lohman, 1957
- Species Navicula utermoehli Hustedt accepted as Navicula utermoehlii Hustedt, 1942
- Species Navicula utermoehlii Hustedt, 1942
- Species Navicula utlandshoerniensis VanLandingham, 1975
- Species Navicula utriculus (Ehrenberg) Kützing, 1844 accepted as Pinnularia utriculus Ehrenberg, 1843
- Species Navicula vacillans A.Schmidt, 1875
- Species Navicula vacillans Cleve-Euler, 1948
- Species Navicula vaga Cleve, 1896
- Species Navicula vagabunda Brun in Schmidt et al., 1892
- Species Navicula vahliana Grunow in Schmidt, 1874
- Species Navicula vahlii Foged, 1964
- Species Navicula valdestriata Hustedt, 1952
- Species Navicula valens Hustedt, 1962
- Species Navicula valens Cholnoky, 1963
- Species Navicula valeriana D. Metzeltin, H. Lange-Bertalot & F. García-Rodríguez, 2005
- Species Navicula valida Cleve & Grunow
- Species Navicula validicostata Cleve-Euler, 1953
- Species Navicula vallis
- Species Navicula vallis-natrii
- Species Navicula vampyra Hohn, 1966
- Species Navicula vana Schmidt in Schmidt et al., 1881
- Species Navicula vandamii Schoeman & Archibald, 1987
- Species Navicula vandermerwei Cholnoky, 1957
- Species Navicula vaneei Lange-Bertalot, 1998
- Species Navicula vanei H. Lange-Bertalot in D. Metzeltin & A. Witkowski, 1996
- Species Navicula vaneldenii Cholnoky, 1957
- Species Navicula vanheurckii R.M.Patrick, 1966
- Species Navicula vanhoeffeniformis Gandhi, 1955
- Species Navicula vanhoeffenii Gran, 1897
- Species Navicula vanidica Cholnoky, 1962
- Species Navicula vanmeelii Kufferath, 1956
- Species Navicula vara Hustedt in Schmidt et al., 1934
- Species Navicula variabilis R.Ross, 1947 accepted as Brachysira vitrea (Grunow) R.Ross, 1986
- Species Navicula variabilis (Heiden & Kolbe) F.W. Mills, 1934 accepted as Libellus variabilis Heiden & Kolbe, 1928
- Species Navicula variabilis Bljumina, 1959
- Species Navicula varians Gregory, 1855
- Species Navicula varikuli Foged, 1972
- Species Navicula variolata Cleve, 1892 accepted as Lyrella variolata (Cleve) D.G.Mann, 1990
- Species Navicula variolinea J.R.Carter, 1971
- Species Navicula variostriata Krasske, 1923 accepted as Cavinula variostriata (Krasske) D.G.Mann & A.J.Stickle, 1990
- Species Navicula varrensis
- Species Navicula vasta Hustedt, 1937
- Species Navicula vaszaryi Pantocsek
- Species Navicula vatinata Carter & Denny, 1982
- Species Navicula vaucheriae Petersen, 1915
- Species Navicula vaupellii Foged, 1962
- Species Navicula vegae Cleve, 1883
- Species Navicula vekhovii Lange-Bertalot & Genkal, 1999
- Species Navicula velata Schmidt in Schmidt et al., 1876
- Species Navicula velata Cleve-Euler, 1953
- Species Navicula velata sensu Cleve-Euler, 1953
- Species Navicula velox Kützing, 1844
- Species Navicula velox Ehrenberg, 1830
- Species Navicula venerablis Hohn & Hellerman, 1963
- Species Navicula veneta Kützing, 1844
- Species Navicula veneta Schumann, 1867
- Species Navicula venetiformis B. Van de Vijver & L. Beyens in Van de Vijver, Frenot & Beyens, 2002
- Species Navicula venetoides S.Blanco, I.Alvarez-Blanco & C.Cejudo-Figueiras, 2012
- Species Navicula venezuelana Cholnoky, 1968
- Species Navicula venezuelensis Hustedt, 1956
- Species Navicula venter (Ehrenberg) De Toni, 1891 accepted as Pinnularia venter Ehrenberg, 1854
- Species Navicula ventosa Hustedt, 1957
- Species Navicula ventralis Krasske, 1923
- Species Navicula ventralis sensu Foged, 1958
- Species Navicula ventraloconfusa Lange-Bertalot, 1989
- Species Navicula ventraloides Hustedt, 1945
- Species Navicula ventricosa Ehrenberg, 1830
- Species Navicula ventricosa (Kützing) F.W.Mills, 1934 accepted as Stauroneis ventricosa var. ventricosa Kützing, 1844
- Species Navicula venus Pantocsek, 1892
- Species Navicula venusta Janisch ex Cleve, 1895
- Species Navicula venusta Pantocsek, 1889
- Variety Navicula venusta var. venusta Janisch, 1888
- Species Navicula venustissima Kitton in Leuduger-Fortmorel, 1892
- Species Navicula verecunda Hustedt, 1930
- Species Navicula verecundaeformis Manguin ex Kociolek & Reviers, 1996
- Species Navicula verecundoides Manguin ex Kociolek & Reviers, 1996
- Species Navicula vernalis Donkin, 1869
- Species Navicula versatilis Marsson, 1900
- Species Navicula versicolor Grunow, 1874
- Species Navicula vertebrata O'Meara, 1872
- Species Navicula vespa (Ehrenberg) Ralfs, 1861 accepted as Pinnularia vespa Ehrenberg, 1854
- Species Navicula vespa O'Meara, 1871
- Species Navicula vesparella Mann, 1925
- Species Navicula veterana Hustedt, 1987
- Species Navicula vetita Krasske, 1941
- Species Navicula vetula A.Schmidt, 1875
- Species Navicula vexans Petit, 1904
- Species Navicula vexativa Manguin, 1952
- Species Navicula vibrio Ehrenberg, 1854
- Species Navicula vichiensis C. Petit in Montagne, 1856
- Species Navicula vicina Hustedt, 1952 accepted as Witkowskia vicina (Hustedt) Kulikovskiy, Glushchenko, Mironov & Kociolek, 2024
- Species Navicula vickersii O'Meara, 1876
- Species Navicula vidovichii Grunow in litteris, 1863
- Species Navicula vilaplanii (Lange-Bertalot & Sabater) Lange-Bertalot & Sabater, 2000
- Species Navicula viminea Hustedt in Schmidt et al., 1934
- Species Navicula viminoides Giffen, 1975
- Species Navicula vincita Carter & Denny, 1982
- Species Navicula viola Schmidt in Schmidt et al., 1896
- Species Navicula virgata Hustedt in Schmidt et al., 1934
- Species Navicula virginalis Hustedt, 1956
- Species Navicula virginea Cleve, 1878
- Species Navicula viridis Ehrenberg, 1838
- Species Navicula viridis (Nitzsch) Ehrenberg, 1832
- Species Navicula viridis sensu Kutzing, 1844
- Species Navicula viridis sensu Pantocsek, 1892
- Species Navicula viridis Schmidt in Schmidt et al., 1876
- Species Navicula viridula (Kützing) Ehrenberg, 1836
- Species Navicula viridula Neupauer, 1867
- Species Navicula viridulacalcis Lange-Bertalot, 2000
- Species Navicula viriduloides H.P.Gandhi, 1959
- Species Navicula virihensis Cleve-Euler, 1953
- Species Navicula virosa Carter & Denny, 1992
- Species Navicula visitanda Carter, 1970
- Species Navicula vitabunda Hustedt, 1930
- Species Navicula vitila Carter & Denny, 1982
- Species Navicula vitiosa Schimanski, 1978 accepted as Nupela vitiosa (Schimanski) Lange-Bertalot, 2004
- Species Navicula vitrea (Østrup) Hustedt, 1930 accepted as Frustulia vitrea Østrup, 1901
- Species Navicula vitrea Grunow in Cleve & Möller, 1879
- Species Navicula vitrea (Cleve) Cleve, 1894 accepted as Pleurosigma vitreum Cleve, 1880
- Species Navicula vitriscala Brun, 1891
- Species Navicula vittata (Cleve) Hustedt, 1955 accepted as Diploneis bioculata var. vittata Cleve, 1894
- Species Navicula vixcylindrata Kulikovskiy Lange-Bertalot & Metzeltin, 2012
- Species Navicula vixvisibilis Hustedt, 1937
- Species Navicula vladivostokensis Skvortzow, 1932
- Species Navicula voigtii F.Meister, 1932
- Species Navicula voigtioides Amossé, 1969
- Species Navicula volcanica Bahls & Potapova, 2015
- Species Navicula voltaensis Foged, 1966
- Species Navicula vonhauseniae Cholnoky, 1954
- Species Navicula vonpostii Cleve-Euler, 1953
- Species Navicula vukotinovicii Pantocsek, 1886
- Species Navicula vula J.R.Carter, 1971
- Species Navicula vulgaris (Thwaites) Petit, 1877 accepted as Schizonema vulgare var. vulgare Thwaites, 1848
- Species Navicula vulpecula Schmidt in Schmidt et al., 1875
- Species Navicula vulpina Kützing, 1844
- Species Navicula vulpina Wislouch, 1921
- Species Navicula vulpina sensu Pantocsek, 1902
- Species Navicula vumbae Cholnoky, 1954
- Species Navicula waernensis Foged, 1964
- Species Navicula walkeri Patrick & Freese, 1961
- Species Navicula walkerii Sovereign, 1958
- Species Navicula wallacei Reimer, 1966
- Species Navicula wallacei Bastow, 1957
- Species Navicula walterconradii Kufferath, 1957
- Species Navicula walzii Reinhard, 1870
- Species Navicula wangii Skvortzov, 2012
- Species Navicula wankaremae Cleve, 1883 accepted as Navicula kryokonites var. wankaremae Cleve, 1894
- Species Navicula wardhensis Sarode & Kamat, 1984
- Species Navicula wardii Patrick, 1959
- Species Navicula warmingii Foged, 1962
- Species Navicula wasmundii Witkowski, Metzeltin & Lange-Bertalot in Metzeltin & Witkowski, 1996
- Species Navicula watveae C. Radhakrishnan, Kociolek & B. Karthick
- Species Navicula wavella Carter & Denny, 1982
- Species Navicula wawrikae Hustedt, 1961 represented as Haslea wawrikae (Hustedt) Simonsen, 1974
- Species Navicula weberi Bahls, 2012
- Species Navicula weikerti E.Manguin, 1952
- Species Navicula weinzierlii H.Schimanski, 1975
- Species Navicula weissflogi A. Schmidt, 1873 accepted as Navicula weissflogii A.W.F.Schmidt, 1873
- Species Navicula weissflogii A.W.F.Schmidt, 1873
- Species Navicula wellingtonica Cholnoky, 1962
- Species Navicula wellneri Lange-Bertalot in Lange-Bertalot & Krammer, 1987 accepted as Nupela wellneri (Lange-Bertalot in Lange-Bertalot & Krammer) Lange-Bertalot in U. Rumrich, H. Lange-Bertalot & M. Rumrich, 2000
- Species Navicula wendlingii Lange-Bert., G.Hofm. & Van de Vijver in Van de Vijver & Lange-Bertalot, 2009
- Species Navicula werestschagini Skvortzov & Meyer
- Species Navicula westermannii Ehrenberg, 1835
- Species Navicula westii W.Smith, 1853
- Species Navicula wetzeli Hustedt in Schmidt et al., 1934
- Species Navicula wheeleri MacKay in Bailey, 1924
- Species Navicula whitefishensis L.Bahls, 2012
- Species Navicula wiesneri Lange-Bertalot, 1993
- Species Navicula wiesnerii Pantocsek, 1886 †
- Species Navicula wigginsiana Patrick & Freese, 1961
- Species Navicula wiktoriae A.Witkowski & Lange-Bertalot, 1994
- Species Navicula wilczeckii Grunow, 1884
- Species Navicula wildii Lange-Bertalot, 1993
- Species Navicula willeri Krasske, 1939
- Species Navicula williamsonii O'Meara, 1875
- Species Navicula willisiae Seddon & Witkowski, 2011
- Species Navicula wilmanni Fritsch & Rich, 1929
- Species Navicula winchelliana H.L. Smith in B.W. Thomas, 1893
- Species Navicula winona Bahls, 2012
- Species Navicula wisei Harwood & Maruyama, 1992
- Species Navicula wislouchii Kutzing
- Species Navicula wislouchii Skvortzov & Meyer
- Species Navicula witkowskii Lange-Bertalot, Iserentant & Metzeltin, 1998
- Species Navicula witti Heiden in Schmidt et al., 1903
- Species Navicula wittiana Grunow in A. Schmidt, 1874
- Species Navicula wittii Grunow in Cleve, 1881
- Species Navicula wittrockii (Lagerstedt) Cleve-Euler, 1934 accepted as Stauroneis wittrockii Lagerstedt, 1873
- Species Navicula wittrockii (Lagerstedt) Tempère & Peragallo, 1909 accepted as Sellaphora wittrockii (Lagerstedt) Lange-Bertalot & D.Metzeltin, 2009
- Species Navicula wohlenbergi Brockmann, 1950
- Species Navicula wolterecki
- Species Navicula woltereckii Hustedt accepted as Navicula helvetica f. wolterecki Hustedt, 1942
- Species Navicula woronichinii Jasnitsky, 1936
- Species Navicula woroninii Mereschkowsky, 1903
- Species Navicula wrightiana Woodhead & Tweed, 1960
- Species Navicula wrightii O'Meara, 1867
- Species Navicula wuestii R.Simonsen, 1959
- Species Navicula wulffii Petersen, 1924
- Species Navicula wunsamiae A. Witkowski, H. Lange-Bertalot & D. Metzeltin, 2000
- Species Navicula wustula Carter & Denny, 1982
- Species Navicula wygaschii Lange-Bertalot, 2001
- Species Navicula xi Cleve
- Species Navicula xi sensu Hustedt in Schmidt et al., 1930
- Species Navicula yabe Skvortzow, 1937
- Species Navicula yarrasii Grunow in H.L. Smith, 1874-1879
- Species Navicula yarrensis Grunow, 1876 accepted as Pinnunavis yarrensis (Grunow) H.Okuno, 1975
- Species Navicula yatukaensis Y.Horikawa & H.Okuno, 1943
- Species Navicula yorkensis Camburn, 1978
- Species Navicula ypsilon Cleve, 1894
- Species Navicula yunnanensis Li & Metzeltin, 2015
- Species Navicula yuraensis Negoro & Gotoh, 1983
- Species Navicula zachariasi Reichelt, 1903
- Species Navicula zagrebensis VanLandingham, 1975
- Species Navicula zahlbruckneri Pantocsek, 1909
- Species Navicula zanardiniana Grunow, 1860
- Species Navicula zanonii
- Species Navicula zanzibarica Greville, 1866 accepted as Lyrella zanzibarica (Greville) D.G.Mann, 1990
- Species Navicula zastronensis Schoeman, 1973
- Species Navicula zebra Ehrenberg, 1833
- Species Navicula zechenteri Pantocsek, 1886
- Species Navicula zeilleri Lauby
- Species Navicula zelebori Ehrenberg, 1862
- Species Navicula zellensis Grunow, 1860 accepted as Brachysira zellensis (Grunow) Round & D.G.Mann, 1981
- Species Navicula zeta Cleve, 1895
- Species Navicula zhengii Witkowski & Ch.Li in Witkowski et al., 2016
- Species Navicula zichyi
- Species Navicula zimmermannii D.F.Gomes & D.M.Williams, 2012
- Species Navicula zipila Carter & Denny, 1982
- Species Navicula zizix Van Landingham, 1975
- Species Navicula zohdyi Salah, 1953
- Species Navicula zonata Hustedt, 1956
- Species Navicula zonula Cholnoky, 1960
- Species Navicula zostereti Grunow
- Species Navicula zostereti sensu Schmidt, 1874
- Species Navicula zsivnyana Krenner, 1926
- Species Navicula zulu Cholnoky, 1957
- Variety Navicula var. angulosa Gregory, 1856 accepted as Navicula palpebralis var. angulosa (Gregory) Van Heurck, 1885
- Variety Navicula var. fasciata
- Variety Navicula var. fonticola Grun. in Van Heurck, 1880 accepted as Caloneis fasciata var. fonticola (Lagerstedt) Østrup
- Genus Naviculadicta H. Lange-Bertalot in H. Lange Bertalot & G. Moser, 1994 (3)
- Genus Naviculopsis V.A. Nikolaev, 1966 accepted as Diatomella R.K. Greville, 1855
- Genus Navigeia L.N.Bukhtiyarova, 2013 (10)
- Genus Navigiolum Lange-Bertalot, H., Cavacini, P., Tagliaventi, N. & Alfinito, S., 2003 (12)
- Genus Neidiopsis H. Lange-Bertalot & D. Metzeltin in H. Lange-Bertalot & S.I. Genkal, 1999 (2)
- Genus Nupela W. Vyverman & P. Compère, 1991 (80)
- Genus Pinnuavis H. Okuno, 1975 accepted as Pinnunavis H. Okuno, 1975
- Genus Pinnunavis H. Okuno, 1975 (2)
- Genus Placogeia L.N.Bukhtiyarova, 2013 (13)
- Genus Prestauroneis K. Bruder & L.K. Medlin, 2008 (7)
- Genus Pseudogomphonema L.K. Medlin in L.K. Medlin & F.E. Round, 1986
- Genus Pseudonavicula G. Karsten, 1899
- Genus Pulchella K. Krammer, 2000 (4)
- Genus Pulchellophycus Edlund & M.J.Wynne, 2019 (8)
- Genus Raphidivergens Chin & Cheng, 1992
- Genus Rhoikoneis A. Grunow, 1863 (2)
- Genus Sabbea Van de Vijver, Bishop & Kopalová in Bishop et al., 2019 (1)
- Genus Scoliolyra C.P. Chen, Y.H. Gao, Z. Wang et J.W. Zhang in Zhang et al., 2020 (1)
- Genus Seminavis D.G. Mann in F.E. Round, R.M. Crawford & D.G. Mann, 1990 (8)
- Genus Slavia L.N.Bukhtiyarova & G.V.Pomazkina, 2013 (4)
- Genus Stauroptera C.G. Ehrenberg, 1843 (1)
- Genus Trachyneis P.T. Cleve, 1894 (4)
- Genus Veigaludwigia H. Lange-Bertalot & U. Rumich in D. Metzeltin & H. Lange-Bertalot, 2007 (1)
- Family Naviculales incertae sedis (7)
- Family Pinnulariaceae D.G. Mann, 1990 (254)
- Family Pleurosigmataceae Mereschkowsky, 1903 (98)
- Family Scolioneidaceae
- Family Scoliotropidaceae Mersechk. (6)
- Family Sellaphoraceae Mereschkowsky, 1902 (74)
- Family Stauroneidaceae D.G. Mann, 1990 (150)
- Order Rhopalodiales (37)
- Order Surirellales (174)
- Order Thalassiophysales (105)
- Superorder Bacillariophycidae incertae sedis (32)
- Superorder Eunotiophycanae (293)
- Subclass Coscinodiscophycidae (877)
- Subclass Fragilariophycidae (483)
- Order Centrales
