• Oscillatoria Vaucher ex Gomont, 1892
• Oscillatoria acuiformis Skuja, 1948
• Oscillatoria acula Brühl & Biswas, 1923 accepted as Phormidium acutum (Brühl & Biswas) Anagnostidis & Komárek, 1988
• Oscillatoria acuminata Gomont, 1892
• Oscillatoria acus Corda ex Gomont, 1892
• Oscillatoria acus Corda, 1836 accepted as Oscillatoria acus Corda ex Gomont, 1892
• Oscillatoria acuta Brühl & Biswas ex Geitler, 1932 accepted as Phormidium acutum (Brühl & Biswas) Anagnostidis & Komárek, 1988
• Oscillatoria acuta Brühl & Biswas, 1922 accepted as Phormidium acutum (Brühl & Biswas) Anagnostidis & Komárek, 1988
• Oscillatoria acutissima H. Kufferath, 1914
• Oscillatoria adansonii Vaucher ex Gomont, 1892
• Oscillatoria adansonii Vaucher, 1803 accepted as Oscillatoria adansonii Vaucher ex Gomont, 1892
• Oscillatoria additica Gardner, 1932
• Oscillatoria aegagropila (Linnaeus) Corda, 1836 accepted as Cladophora aegagropila (Linnaeus) Trevisan, 1845 accepted as Aegagropila linnaei Kützing, 1843 accepted as
• Oscillatoria aerugescens Drummond ex Gomont, 1892
• Oscillatoria aerugescens Drummond, 1838 accepted as Oscillatoria aerugescens Drummond ex Gomont, 1892
• Oscillatoria aeruginea Martius, 1817
• Oscillatoria aeruginosa C. Agardh ex Gomont, 1892
• Oscillatoria aeruginosa C. Agardh, 1817 accepted as Oscillatoria aeruginosa C. Agardh ex Gomont, 1892
• Oscillatoria aeruginosa Corda, 1836
• 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 affinis Kützing ex Gomont, 1892
• Oscillatoria agardhii Gomont, 1892 accepted as Planktothrix agardhii (Gomont) Anagnostidis & Komárek, 1988
• Oscillatoria alata Carmichael ex Gomont, 1892
• Oscillatoria alata Carmichael, 1826 accepted as Oscillatoria alata Carmichael ex Gomont, 1892
• Oscillatoria alba Vaucher, 1803
• Oscillatoria alcyonii P.L. Crouan & H.M. Crouan ex Gomont, 1892
• Oscillatoria americana Kützing ex Gomont, 1892
• Oscillatoria amethystina H.F. Buell, 1938
• Oscillatoria amoena (Kützing) Gomont, 1892 accepted as Phormidium amoenum Kützing, 1843
• Oscillatoria amphibia C. Agardh ex Gomont, 1892 accepted as Geitlerinema amphibium (C. Agardh ex Gomont) Anagnostidis, 1989
• Oscillatoria amphibia C. Agardh, 1827 accepted as Phormidium amphibium (C. Agardh ex Gomont) Anagnostidis & Komárek, 1988
• Oscillatoria amphigranulata van Goor, 1918 accepted as Limnothrix amphigranulata (van Goor) Meffert, 1987
• Oscillatoria angistissima
• Oscillatoria anguiformis (P. González Guerrero) Anagnostidis, 2001
• Oscillatoria anguina Bory ex Gomont, 1892
• Oscillatoria angusta Koppe, 1924
• Oscillatoria angustissima W. West & G.S. West, 1897 accepted as Jaaginema angustissimum (W. West & G.S. West) Anagnostidis & Komárek, 1988
• Oscillatoria animalis C. Agardh ex Gomont, 1892 accepted as Phormidium animale (C. Agardh ex Gomont) Anagnostidis & Komárek, 1988
• Oscillatoria animalis C. Agardh, 1827 accepted as Phormidium animale (C. Agardh ex Gomont) Anagnostidis & Komárek, 1988
• Oscillatoria anissimovae Elenkin, 1949
• Oscillatoria annae van Goor, 1918
• Oscillatoria annularis Corda, 1836
• Oscillatoria anomala Bharadwaja, 1963
• Oscillatoria antarctica A. Massalski, T. Mrozinska & M. Olech
• Oscillatoria anthracina De Notaris ex Gomont, 1892
• Oscillatoria anthracina De Notaris, 1846 accepted as Oscillatoria anthracina De Notaris ex Gomont, 1892
• Oscillatoria antilarum P.L. Crouan & H.M. Crouan
• 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
• Oscillatoria apiculata Corda, 1836
• Oscillatoria arachnoidea Bory ex Gomont, 1892
• Oscillatoria arachnoidea C. Agardh ex Gomont, 1892
• Oscillatoria arachnoidea C. Agardh, 1827 accepted as Oscillatoria arachnoidea C. Agardh ex Gomont, 1892
• Oscillatoria arenaria C. Agardh ex Gomont, 1892
• Oscillatoria arenaria C. Agardh, 1824 accepted as Oscillatoria arenaria C. Agardh ex Gomont, 1892
• Oscillatoria arnoldii Kisselev, 1927 accepted as Planktothrix arnoldii (Kisselev) Anagnostidis & Komárek, 1988
• Oscillatoria articulata Gardner, 1927 accepted as Phormidium articulatum (Gardner) Anagnostidis & Komárek, 1988
• Oscillatoria atlantica Lindstedt, 1962
• Oscillatoria atropurpurea (Roth) C. Agardh, 1817 accepted as Bangia atropurpurea (Mertens ex Roth) C. Agardh, 1824
• Oscillatoria attenuata Woronichin, 1932 accepted as Geitlerinema attenuatum (Woronichin) Anagnostidis, 2001
• Oscillatoria augstumnalis Schmidle
• Oscillatoria australis C. Agardh ex Gomont, 1892
• Oscillatoria australis C. Agardh, 1827 accepted as Oscillatoria australis C. Agardh ex Gomont, 1892
• Oscillatoria autumnalis C. Agardh, 1812
• Oscillatoria bacillus (O.F. Müller) Schrank ex Gomont, 1892
• Oscillatoria balkrishnanii (N.D. Kamat) J.A. Rino
• Oscillatoria baltica Eberly, 1966
• Oscillatoria bangii Carmichael ex Forti, 1907
• Oscillatoria bangii Carmichael, 1884 accepted as Oscillatoria bangii Carmichael ex Forti, 1907
• Oscillatoria batrachospermorum Skuja, 1964 accepted as Pseudanabaena batrachospermorum (Skuja) Anagnostidis & Komárek, 1988
• Oscillatoria beccariana Gomont ex Forti, 1907 accepted as Phormidium beccarianum (Gomont ex Forti) Anagnostidis & Komárek, 1988
• Oscillatoria beggiatoiformis Gomont, 1892
• Oscillatoria bekesiensis I. Kiss, 1959 accepted as Phormidium bekesiense (I. Kiss) K. Kiss, 2001
• Oscillatoria belmontica Welsh, 1966
• Oscillatoria bharadwajae Kamat, 1963
• Oscillatoria bicudoi P.A.C. Senna
• Oscillatoria biswasii Kamat, 1963
• Oscillatoria biterminalis Nash, 1938
• Oscillatoria bonnemaisonii (P.L. Crouan & H.M. Crouan) P.L. Crouan & H.M. Crouan ex Gomont, 1892
• Oscillatoria bonnemaisonii (P.L. Crouan & H.M. Crouan) P.L. Crouan & H.M. Crouan, 1860 accepted as Oscillatoria bonnemaisonii (P.L. Crouan & H.M. Crouan) P.L. Crouan & H.M. Crouan ex Gomont, 1892
• Oscillatoria bonnemansonii (P. Crouan & H. Crouan) P. Crouan & H. Crouan
• Oscillatoria bornetii (Zukal) Forti, 1907 accepted as Tychonema bornetii (Zukal) Anagnostidis & Komárek, 1988
• Oscillatoria borodinii Woronichin, 1927 accepted as Jaaginema borodinii (Woronichin) Anagnostidis & Komárek, 1988
• Oscillatoria boryana Bory ex Gomont, 1892 accepted as Phormidium boryanum (Bory ex Gomont) Anagnostidis & Komárek, 1988
• Oscillatoria bourrellyi J.W.G. Lund, 1955
• 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 bulgarica Komárek, 1956 accepted as Phormidium bulgaricum (Komárek) Anagnostidis & Komárek, 1988
• Oscillatoria byssoidea Von Andrejewskiy, 1831
• Oscillatoria caerulea Kützing ex Gomont, 1892
• Oscillatoria caerulescens Gicklhorn, 1921 accepted as Phormidium caerulescens (Gicklhorn) Anagnostidis, 2001
• Oscillatoria calcicola C. Agardh, 1812 accepted as Schizothrix calcicola (C. Agardh) Gomont ex Gomont, 1892
• Oscillatoria calcuttensis Biswas, 1925
• Oscillatoria caldariorum Hauck ex Gomont, 1892 accepted as Oscillatoria sancta Kützing ex Gomont, 1892
• Oscillatoria calida C. Agardh, 1822 accepted as Phormidium calidum (C. Agardh) Gomont ex Gomont, 1892
• Oscillatoria canescens C. Agardh ex Gomont, 1892