Abdopus abaculus (M.D. Norman& M.J. Sweeney, 1997)
Benthoctopus abruptus (M. Sasaki, 1920)
Abdopus aculeatus (A.V.M.D. D'Orbigny,1834)
Adelieledone adelieana (S.S. Berry, 1917)
Amphioctopus aegina (J.E. Gray, 1849)
Pareledone aequipapillae L. Allcock, 2005
Octopus alatus (M. Sasaki, 1920)
Octopus alberti L.M.A.O.E. Joubin, 1895
Bentheledone albida (S.S. Berry, 1917)
Pareledone albimaculata L. Allcock, 2005
Teretoctopus alcocki C.W. Robson, 1932
Octopus alecto S.S. Berry, 1953
Callistoctopus alpheus (M.D. Norman, 1993)
Octopus amboinensis P. Brock, 1887
Danoctopus annae (V.P. Oommen, 1980)
Styletoctopus annae (FOSSIL) A. Fuchs,Bracchi & Weis, 2009 †
Pareledone antarctica (K.H.J. Thiele, 1920)
Graneledone antarctica N.A. Voss, 1976
Octopus aranea D'Orbigny, 1834
Octopus araneoides Iw. Taki, 1964
Octopus arborescens W.E. Hoyle, 1904
Amphioctopus arenicola Huffard & F.G. Hochberg,2005
Octopus argus C.F.F. von Krauss, 1848
Callistoctopus aspilosomatis (M.D. Norman, 1993)
Pareledone aurata L. Allcock, 2005
Pareledone aurorae (S.S. Berry, 1917)
Octopus australis W.E. Hoyle, 1885
Octopus balboai N.A. Voss, 1971
Octopus bandensis W.E. Hoyle, 1885
Octopus berenice J.E. Gray, 1849
Octopus berrima Stanks & M.D. Norman,1992
Benthoctopus berryi C.W. Robson, 1924
Octopus bimaculatus A.E. Verrill, 1883
Octopus bimaculoides G.E. Pickford& McConnaughey, 1949
Octopus bocki W. Adam, 1941