Between brackets is the number of accepted species
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- Mollusca (132 754)
- Subphylum Aculifera
- Subphylum Conchifera
- Subphylum Placophora accepted as Polyplacophora
- Superclass Aplacophora
- Class Amphineura accepted as Aculifera
- Class Bivalvia (24 992)
- Class Caudofoveata (143)
- Class Cephalopoda (1 832)
- Subclass Coleoidea (1 135)
- Superorder Ammonoida † (76)
- Superorder Bactritoidea †
- Superorder Decabrachia represented as Decapodiformes
- Superorder Decapodiformes (715)
- Superorder Octobrachia represented as Octopodiformes
- Superorder Octopodiformes (341)
- Order Octopoda (328)
- Suborder Cirrata (54)
- Suborder Incirrata (274)
- Superfamily Argonautoidea Cantraine, 1841 (13)
- Superfamily Bolitaenoidea Chun, 1911 accepted as Octopodoidea A. d'Orbigny, 1839
- Superfamily Octopodoidea A. d'Orbigny, 1839 (257)
- Family Amphitretidae Hoyle, 1886 (9)
- Family Bathypolypodidae G. C. Robson, 1929 (7)
- Family Bolitaenidae Chun, 1911 accepted as Bolitaeninae Chun, 1911
- Family Eledonidae Rochebrune, 1884 (7)
- Family Enteroctopodidae Strugnell, Norman, Vecchione, Guzik & Allcock, 2014 (34)
- Family Idioctopodidae Taki, 1962 accepted as Amphitretinae Hoyle, 1886 (1)
- Family Laemoteuthidae
- Family Megaleledonidae Iw. Taki, 1961 (41)
- Family Octopodidae A. d'Orbigny, 1839 (158)
- Subfamily Bathypolypodinae G. C. Robson, 1929 accepted as Bathypolypodidae G. C. Robson, 1929
- Subfamily Eledoninae Rochebrune, 1884 accepted as Eledonidae Rochebrune, 1884
- Subfamily Megaleledoninae Iw. Taki, 1961 accepted as Megaleledonidae Iw. Taki, 1961
- Genus Abdopus Norman & Finn, 2001 (7)
- Genus Ameloctopus Norman, 1992 (1)
- Genus Amphioctopus P. Fischer, 1882 (16)
- Genus Berrya Adam, 1939 accepted as Pteroctopus P. Fischer, 1882
- Genus Bolcaoctopus Mironenko, Giusberti, Serafini, Zorzin & Bannikov, 2024 † (1)
- Genus Callistoctopus Taki, 1964 (11)
- Genus Cistopus Gray, 1849 (4)
- Genus Danoctopus Joubin, 1933 accepted as Pteroctopus P. Fischer, 1882 (1)
- Genus Eledona Risso, 1854 accepted as Eledone Leach, 1817
- Genus Eledonenta Rochebrune, 1884
- Genus Euaxoctopus G. L. Voss, 1971 (3)
- Genus Galeoctopus Norman, Boucher & Hochberg, 2004 (1)
- Genus Grimpella G. C. Robson, 1928 (1)
- Genus Hallia Rochebrune, 1884 accepted as Hoylea Rochebrune, 1885
- Genus Hapalochlaena G. C. Robson, 1929 (4)
- Genus Hapaloctopus Taki, 1962 accepted as Berrya Adam, 1939
- Genus Histoctopus Norman, Boucher-Rodoni & Hochberg, 2009 (2)
- Genus Hoylea Rochebrune, 1885 accepted as Eledone Leach, 1817
- Genus Joubinia G. C. Robson, 1929 accepted as Robsonella Adam, 1938
- Genus Lepidoctopus Haimovici & Sales, 2019 (1)
- Genus Macrochlaena G. C. Robson, 1929 (1)
- Genus Macroctopus G. C. Robson, 1928 (1)
- Genus Macrotritopus Grimpe, 1922 (2)
- Genus Moschites J. G. Schneider, 1784
- Genus Octopus Cuvier, 1798 (73)
- Genus Ozoena Rafinesque, 1814 accepted as Eledone Leach, 1817
- Genus Paroctopus Naef, 1923 (3)
- Genus Pinnoctopus A. d'Orbigny, 1845 (8)
- Species Pinnoctopus alpheus (Norman, 1993)
- Species Pinnoctopus aspilosomatis (Norman, 1993)
- Species Pinnoctopus cordiformis (Quoy & Gaimard, 1832)
- Species Pinnoctopus dierythraeus (Norman, 1993)
- Species Pinnoctopus graptus (Norman, 1993)
- Species Pinnoctopus kermadecensis (S. S. Berry, 1914)
- Species Pinnoctopus macropus (Risso, 1826)
- Species Pinnoctopus ornatus (A. Gould, 1852)
- Genus Polypus Leach, 1817 accepted as Octopus Cuvier, 1798
- Genus Pteroctopus P. Fischer, 1882 (3)
- Genus Robsonella Adam, 1938 (4)
- Genus Sasakinella Taki, 1964 accepted as Pteroctopus P. Fischer, 1882
- Genus Scaeurgus Troschel, 1857 (5)
- Genus Schizoctopus Hoyle, 1886 accepted as Amphioctopus P. Fischer, 1882
- Genus Styletoctopus Fuchs, Bracchi & Weis, 2009 † (1)
- Genus Teretoctopus G. C. Robson, 1929 (2)
- Genus Thaumoctopus Norman & Hochberg, 2005 (1)
- Genus Tritaxeopus R. Owen, 1881
- Genus Wunderpus Hochberg, Norman & Finn, 2006 (1)
- Family Vitreledonellidae G. C. Robson, 1932 accepted as Vitreledonellinae G. C. Robson, 1932
- Family Palaeoctopodidae Dollo, 1912 † (4)
- Family Palaeopolypodidae Grimpe, 1916 † accepted as Palaeoctopodidae Dollo, 1912 †
- Suborder Palaeoctopoda accepted as Incirrata
- Genus Hectocotylus Cuvier, 1829
- Order Vampyromorpha (13)
- Order Coleoidea incertae sedis † (3)
- Subclass Endoceratia † (32)
- Subclass Multiceratia † (290)
- Subclass Nautiloida (136)
- Subclass Orthoceratia † (200)
- Subclass Plectronoceratia † (16)
- Subclass Tarphyceratia † (23)
- Class Conchifera accepted as Bivalvia
- Class Cricoconarida † (1)
- Class Gastropoda (102 679)
- Class Lamellibranchiata accepted as Bivalvia
- Class Loricata accepted as Polyplacophora
- Class Mollusca incertae sedis † (372)
- Class Monoplacophora (229)
- Class Pelecypoda accepted as Bivalvia
- Class Polyplacophora (1 377)
- Class Polyplaxiphora accepted as Polyplacophora
- Class Rostroconchia † (64)
- Class Scaphopoda (752)
- Class Solenoconchia accepted as Scaphopoda
- Class Solenogastres (313)
- Subclass Chaetodermomorpha accepted as Caudofoveata
