Octopus rubescens S.S. Berry, 1953
Octopus rugosus (L.A.G. d'A. Bosc, 1792)
Octopus salutii J.B. Vérany, 1836
Octopus sanctaehelenae C.W. Robson, 1929
Octopus saphenia J.E. Gray, 1849
Octopus sasakii Iw. Taki, 1942
Euaxoctopus scalenus (W.E. Hoyle, 1904)
Pteroctopus schmidti (L.M.A.O.E. Joubin, 1933)
Eledone schultzei (W.E. Hoyle, 1910)
Octopus selene N.A. Voss, 1971
Pareledone serperastrata L. Allcock, 2005
Amphioctopus siamensis (A. Nateewathana& M.D. Norman, 1999)
Tetracheledone spinicirrhus N.A. Voss, 1955
Octopus spinosus M. Sasaki, 1920
Octopus stictochrus N.A. Voss, 1971
Pareledone subtilis L. Allcock, 2005
Octopus superciliosus J.R.C. Quoy & J.P. Gaimard,1832
Octopus taganga Guerrero-Kommritz& Camelo-Guarin, 2016
Cistopus taiwanicus Liao & C.C. Lu, 2009
Graneledone taniwha B.J. O'Shea, 1999
Callistoctopus taprobanensis (G.C. Robson, 1926)
Octopus tayrona Guerrero-Kommritz& Camelo-Guarin, 2016
Octopus tehuelchus D'Orbigny, 1834
Octopus tenebricus E.A. Smith, 1884
Octopus tenuipulvinus M. Sasaki, 1920
Pteroctopus tetracirrhus (S. Delle Chiaje, 1830)
Octopus tetricus A.A. Gould, 1852
Octopus teuthoides C.W. Robson, 1929
Grimpella thaumastocheir C.W. Robson, 1928
Benthoctopus thielei C.W. Robson, 1932
Velodona togata C. Chun, 1915
Abdopus tonganus (W.E. Hoyle, 1885)
Octopus tsugarensis M. Sasaki, 1920
Scaeurgus tuber M.D. Norman, F.G. Hochberg& R. Boucher-Rodoni, 2005
Pareledone turqueti (L.M.A.O.E. Joubin, 1905)