• Oscillatoria Vaucher ex Gomont, 1892
• Oscillatoria acuiformis Skuja, 1948 accepted as Geitlerinema acuiforme (Skuja) Anagnostidis, 2001
• Oscillatoria acula Brühl & Biswas, 1922 accepted as Phormidium acula (Brühl & Biswas) Anagnostidis & Komárek, 1988
• Oscillatoria acuminata Gomont, 1892 accepted as Oxynema acuminatum (Gomont) Chatchawan, Komárek, Strunecky, Smarda & Peerapornpisal, 2012
• Oscillatoria acuminata f. longe-attenuata Geitler & Ruttner, 1935 accepted as
• Oscillatoria acuminata f. phormidioides Anagnostidis, 1961 accepted as Leptolyngbya phormidioides (Anagnostidis) Anagnostidis & Komárek, 1988
• Oscillatoria acuminata f. tenuis Parukutty, 1939
• Oscillatoria acuta Brühl & Biswas, 1922 accepted as Phormidium acula (Brühl & Biswas) Anagnostidis & Komárek, 1988
• Oscillatoria acutiformis Skuja
• Oscillatoria acutissima Kufferath, 1914 accepted as Anagnostidinema acutissimum (Kufferath) Strunecký, Bohunická, J.R.Johansen & J.Komárek, 2017
• Oscillatoria additica N.L.Gardner, 1932
• Oscillatoria aegagropila (Linnaeus) Corda, 1836 accepted as Cladophora aegagropila (Linnaeus) Trevisan, 1845 accepted as Aegagropila linnaei Kützing, 1843 accepted as Aegagropila brownii (Dillwyn) Kützing, 1854
• Oscillatoria aerugescens Drummond ex Gomont, 1892
• Oscillatoria aerugescens Drummond, 1838 accepted as Oscillatoria aerugescens Drummond ex Gomont, 1892
• Oscillatoria aeruginea C.Martius, 1817 (uncertain)
• Oscillatoria aerugineocaerulea Kützing, 1843 (uncertain)
• Oscillatoria aeruginosa C.Agardh, 1817
• Oscillatoria aestuarii (Mertens) Lyngbye ex Gomont, 1892 accepted as Lyngbya aestuarii Liebman ex Gomont, 1892
• Oscillatoria aestuarii (Mertens) Lyngbye, 1818 accepted as Lyngbya aestuarii Liebman ex Gomont, 1892
• Oscillatoria aestuarii var. atrovirens Jürgens ex Gomont, 1892 accepted as Lyngbya aestuarii Liebman ex Gomont, 1892
• Oscillatoria agardhii Gomont, 1892 accepted as Planktothrix agardhii (Gomont) Anagnostidis & Komárek, 1988
• Oscillatoria agardhii f. aequicrassa Elenkin, 1949 accepted as Planktothrix agardhii (Gomont) Anagnostidis & Komárek, 1988
• Oscillatoria agardhii f. gomontii Elenkin, 1949 accepted as Planktothrix agardhii (Gomont) Anagnostidis & Komárek, 1988
• Oscillatoria agardhii f. isothrix (Skuja) Poljansky, 1953 accepted as Planktothrix mougeotii Anagnostidis & Komárek, 1988
• Oscillatoria agardhii f. lemmermannii Elenkin, 1949 accepted as Planktothrix agardhii (Gomont) Anagnostidis & Komárek, 1988
• Oscillatoria agardhii f. moebiusii Elenkin, 1949 accepted as Planktothrix agardhii (Gomont) Anagnostidis & Komárek, 1988
• Oscillatoria agardhii f. wislouchii Elenkin, 1949 accepted as Planktothrix agardhii (Gomont) Anagnostidis & Komárek, 1988
• Oscillatoria agardhii var. isothrix Skuja, 1948 accepted as Planktothrix isothrix (Skuja) Komárek & Komárková, 2004
• Oscillatoria agardhii var. suspensa Pringsheim, 1965 accepted as Planktothrix suspensa (Pringsheim) Anagnostidis & Komárek, 1988
• Oscillatoria alata Carmichael ex Gomont, 1892
• Oscillatoria alba Vaucher, 1803 accepted as Beggiatoa alba (Vaucher) Trevisan, 1845
• Oscillatoria amethystina H.F.Buell, 1938
• Oscillatoria amoena Gomont, 1892 accepted as Microcoleus amoenus (Gomont) Strunecky, Komárek & J.R.Johansen, 2013
• Oscillatoria amoena var. major Vasishta, 1965
• Oscillatoria amoena var. non-granulata Ghose, 1927
• Oscillatoria amphibia C.Agardh ex Gomont, 1892 accepted as Anagnostidinema amphibium (C.Agardh ex Gomont) Strunecký, Bohunická, J.R.Johansen & J.Komárek, 2017
• Oscillatoria amphibia f. circinata Anagnostidis, 1961 accepted as Geitlerinema amphibium (Gomont) Anagnostidis, 1989 accepted as Anagnostidinema amphibium (C.Agardh ex Gomont) Strunecký, Bohunická, J.R.Johansen & J.Komárek, 2017
• Oscillatoria amphibia f. contorta G.S.West, 1909 accepted as Geitlerinema amphibium (Gomont) Anagnostidis, 1989 accepted as Anagnostidinema amphibium (C.Agardh ex Gomont) Strunecký, Bohunická, J.R.Johansen & J.Komárek, 2017
• Oscillatoria amphibia f. tenuis Anisimova, 1949 accepted as Anagnostidinema tenue (Anisimova) Strunecky & al., 2017
• Oscillatoria amphibia f. tenuis Elenkin ex Hollerbach, Kossinskaja & V.I.Poljansky, 1953 (uncertain)
• Oscillatoria amphibia var. acus J.Copeland, 1936 accepted as Geitlerinema acus (J.Copeland) Anagnostidis, 1989
• Oscillatoria amphibia var. aspera Playfair, 1915
• Oscillatoria amphibia var. bigranulata Playfair, 1913
• Oscillatoria amphibia var. kuetzingiana (Nägeli) Geitler, 1925 accepted as Jaaginema kuetzingianum (Nägeli ex Gomont) Anagnostidis & Komárek, 1988
• Oscillatoria amphibia var. major Playfair, 1915
• Oscillatoria amphibia var. maxima Playfair, 1915
• Oscillatoria amphigranulata Goor, 1918 accepted as Pseudanabaena amphigranulata (Goor) Anagnostidis, 2001
• Oscillatoria anguiformis (P.González Guerrero) Anagnostidis, 2001
• Oscillatoria anguina Bory ex Gomont, 1892
• Oscillatoria angusta Koppe, 1924
• Oscillatoria angustissima West & G.S.West, 1897 accepted as Jaaginema angustissimum (West & G.S.West) Anagnostidis & Komárek, 1988
• Oscillatoria animalis C.Agardh ex Gomont, 1892 accepted as Kamptonema animale (C.Agardh ex Gomont) Strunecký, Komárek & J.Smarda, 2014
• Oscillatoria animalis f. chilensis Schwabe, 1936 accepted as Geitlerinema chilense (Schwabe) Anagnostidis, 2001
• Oscillatoria animalis f. paradoxa E.Skalna, 1984 (uncertain)
• Oscillatoria animalis f. tenuior Stockmayer, 1900 accepted as Geitlerinema tenuius (Stockmayer) Anagnostidis, 2001
• Oscillatoria annae Goor, 1918
• Oscillatoria annularis Corda, 1836
• Oscillatoria anomala Bharadwaja, 1963 accepted as Phormidium anomalum (Bharadwaja) Anagnostidis & Komárek, 1988
• Oscillatoria antarctica A.Massalski, T.Mrozinska & M.Olech, 1999
• Oscillatoria antillarum Kützing ex Gomont, 1892
• Oscillatoria antliaria Mertens ex Gomont, 1892
• Oscillatoria antliaria Mertens, 1822 accepted as Oscillatoria antliaria Mertens ex Gomont, 1892
• Oscillatoria apiculata Corda ex Gomont, 1892 (uncertain)
• Oscillatoria arachnoidea Bory ex Gomont, 1892
• Oscillatoria arachnoidea C.Agardh ex Gomont, 1892 (unaccepted)
• Oscillatoria arenaria C.Agardh ex Gomont, 1892 accepted as Lyngbya arenaria (Gomont) Hansgirg, 1889
• Oscillatoria articulata N.L.Gardner, 1927 accepted as Phormidium articulatum (N.L.Gardner) Anagnostidis & Komárek, 1988
• Oscillatoria articulata var. circinata N.L.Gardner, 1927
• Oscillatoria atropurpurea (Mertens ex Roth) C.Agardh, 1817 accepted as Bangia atropurpurea (Mertens ex Roth) C.Agardh, 1824
• Oscillatoria attenuata Woronichin [Voronichin], 1932 accepted as Geitlerinema attenuatum (Woronichin) Anagnostidis, 2001
• Oscillatoria augstumnalis Schmidle (uncertain)
• Oscillatoria australis C.Agardh ex Gomont, 1892
• Oscillatoria autumnalis C.Agardh, 1812 accepted as Microcoleus autumnalis (Gomont) Strunecky, Komárek & J.R.Johansen, 2013
• Oscillatoria bacillus Schrank ex Gomont, 1892
• Oscillatoria balkrishnanii (N.D.Kamat) J.A.Rino, 1972 accepted as Arthrospira balkrishnanii N.D.Kamat, 1963
• Oscillatoria baltica Eberly, 1966
• Oscillatoria beccariana Gomont ex Forti, 1907 accepted as Phormidium beccarianum (Gomont ex Forti) Anagnostidis & Komárek, 1988
• Oscillatoria beggiatoiformis Gomont, 1892 accepted as Microcoleus beggiatoiformis (Gomont) Strunecky, Komárek & J.R.Johansen, 2013
• Oscillatoria beggiatoiformis var. maxima J.J.Copeland, 1936
• Oscillatoria bekesiensis I.Kiss, 1959 accepted as Phormidium bekesiense (I.Kiss) K.Kiss, 2001
• Oscillatoria belmontica H.Welsh, 1966
• Oscillatoria bharadwajae Kamat, 1963
• Oscillatoria bicudoi P.A.C.Senna, 1983
• Oscillatoria biterminalis A.Nash, 1938 (uncertain)
• Oscillatoria bonnemaisonii P.Crouan & H.Crouan ex Gomont, 1892
• Oscillatoria bonnemaisonii var. intermedia (P.Crouan & H.Crouan ex Gomont) Ardré, 1970 accepted as Oscillatoria intermedia P.Crouan & H.Crouan ex Gomont, 1892
• Oscillatoria bonnemaisonii var. minor L.Hoffmann & V.Demoulin, 1993
• Oscillatoria bonnemansonii (P. Crouan & H.Crouan) P. Crouan & H. Crouan
• Oscillatoria bornetii (Zukal) Forti, 1907 accepted as Tychonema bornetii (Zukal) Anagnostidis & Komárek, 1988
• Oscillatoria bornetii f. tenuis Skuja, 1948 accepted as Tychonema bourrellyi (J.W.G.Lund) Anagnostidis & Komárek, 1988
• Oscillatoria bornetii var. intermedia Woronichin, 1930
• Oscillatoria borodinii Woronichin [Voronichin], 1927 accepted as Jaaginema borodinii (Woronichin) Anagnostidis & Komárek, 1988
• Oscillatoria boryana Bory de Saint-Vincent ex Gomont, 1892 accepted as Phormidium boryanum (Gomont) Anagnostidis & Komárek, 1988
• Oscillatoria boryana var. marina L.Hoffmann & V.Demoulin, 1993
• Oscillatoria bourrellyi J.W.G.Lund, 1955 accepted as Tychonema bourrellyi (J.W.G.Lund) Anagnostidis & Komárek, 1988
• Oscillatoria bourrellyi Kamat, 1963
• Oscillatoria breviarticulata Frémy, 1930
• Oscillatoria brevis Kützing ex Gomont, 1892 accepted as Phormidium breve (Kützing ex Gomont) Anagnostidis & Komárek, 1988
• Oscillatoria brevis Schröter, 1883 accepted as Phormidium schroeteri (Hansgirg) Anagnostidis, 2001
• Oscillatoria brevis f. variabilis Wille, 1922 accepted as Phormidium variabile (Wille) Anagnostidis & Komárek, 1988