1. Species Octopus alecto S. S. Berry, 1953
2. Species Octopus americanus Froriep, 1806
3. Species Octopus argus Krauss, 1848
4. Species Octopus australis Hoyle, 1885
5. Species Octopus balboai G. L. Voss, 1971
6. Species Octopus berenice Gray, 1849
7. Species Octopus berrima Stranks & Norman, 1992
8. Species Octopus bimaculatus A. E. Verrill, 1883
9. Species Octopus bimaculoides Pickford & McConnaughey, 1949
10. Species Octopus bocki Adam, 1941
11. Species Octopus briareus G. C. Robson, 1929
12. Species Octopus bulbus Norman, 2001
13. Species Octopus californicus (S. S. Berry, 1911)
14. Species Octopus chierchiae Jatta, 1889
15. Species Octopus conispadiceus (Sasaki, 1917)
16. Species Octopus cyanea Gray, 1849
17. Species Octopus diminutus Kaneko & Kubodera, 2008
18. Species Octopus djinda Amor, 2021
19. Species Octopus favonius Gray, 1849
20. Species Octopus fitchi S. S. Berry, 1953
21. Species Octopus gardineri (Hoyle, 1905)
22. Species Octopus gorgonus Huffard, 2007
23. Species Octopus harpedon Norman, 2001
24. Species Octopus hattai (Sasaki, 1929)
25. Species Octopus hawaiiensis Souleyet, 1852
26. Species Octopus hongkongensis (Hoyle, 1885)
27. Species Octopus hubbsorum S. S. Berry, 1953
28. Species Octopus humilis Huffard, 2007
29. Species Octopus hummelincki Adam, 1936
30. Species Octopus incella Kaneko & Kubodera, 2007
31. Species Octopus insularis Leite & Haimovici, 2008
32. Species Octopus jeraldi A. Pratt, Baldwin & Vecchione, 2020
33. Species Octopus jollyorum A. Reid & N. G. Wilson, 2015
34. Species Octopus joubini G. C. Robson, 1929
35. Species Octopus kaharoa O'Shea, 1999
36. Species Octopus kapalae Mitchell & A. Reid, 2017
37. Species Octopus kaurna Stranks, 1990
38. Species Octopus laqueus Kaneko & Kubodera, 2005
39. Species Octopus mariles Huffard, 2007
40. Species Octopus maya G. L. Voss & Solís, 1966
41. Species Octopus microphthalmus E. S. Goodrich, 1896
42. Species Octopus micropyrsus S. S. Berry, 1953
43. Species Octopus micros Norman, 2001
44. Species Octopus mimus A. Gould, 1852
45. Species Octopus minor (Sasaki, 1920)
46. Species Octopus mutilans Taki, 1942
47. Species Octopus nanus Adam, 1973
48. Species Octopus occidentalis Steenstrup, 1886
49. Species Octopus oculifer (Hoyle, 1904)
50. Species Octopus oliveri (S. S. Berry, 1914)
51. Species Octopus pallidus Hoyle, 1885
52. Species Octopus parvus (Sasaki, 1917)
53. Species Octopus penicillifer S. S. Berry, 1954
54. Species Octopus pumilus Norman & Sweeney, 1997
55. Species Octopus pyrum Norman, Hochberg & Lu, 1997
56. Species Octopus rubescens S. S. Berry, 1953
57. Species Octopus salutii Vérany, 1839
58. Species Octopus sanctaehelenae G. C. Robson, 1929
59. Species Octopus selene G. L. Voss, 1971
60. Species Octopus sinensis A. d'Orbigny, 1834
61. Species Octopus stictochrus G. L. Voss, 1971
62. Species Octopus superciliosus Quoy & Gaimard, 1832
63. Species Octopus taganga Guerrero-Kommritz & Camelo-Guarin, 2016
64. Species Octopus tayrona Guerrero-Kommritz & Camelo-Guarin, 2016
65. Species Octopus tehuelchus A. d'Orbigny, 1835
66. Species Octopus tetricus A. Gould, 1852
67. Species Octopus veligero S. S. Berry, 1953
68. Species Octopus verrucosus Hoyle, 1885
69. Species Octopus vitiensis Hoyle, 1885
70. Species Octopus vulgaris Cuvier, 1797
71. Species Octopus warringa Stranks, 1990
72. Species Octopus wolfi (Wülker, 1913)
73. Species Octopus zonatus G. L. Voss, 1968
74. Subgenus Octopus (Abdopus) Norman & Finn, 2001 accepted as Abdopus Norman & Finn, 2001
    1. Species Octopus (Abdopus) aculeatus A. d'Orbigny, 1834 accepted as Abdopus aculeatus (A. d'Orbigny, 1834) (superseded combination)
    2. Species Octopus (Abdopus) capricornicus Norman & Finn, 2001 accepted as Abdopus capricornicus (Norman & Finn, 2001) (original combination)
75. Subgenus Octopus (Macroctopus) G. C. Robson, 1928 accepted as Macroctopus G. C. Robson, 1928
76. Subgenus Octopus (Macrotritopus) Grimpe, 1922 accepted as Macrotritopus Grimpe, 1922
    1. Species Octopus (Macrotritopus) danae Joubin & G. C. Robson, 1929 accepted as Scaeurgus unicirrhus (Delle Chiaje, 1841) (unaccepted > junior subjective synonym)
    2. Species Octopus (Macrotritopus) equivocus G. C. Robson, 1929 accepted as Macrotritopus equivocus (G. C. Robson, 1929) (unaccepted > superseded combination)
77. Subgenus Octopus (Philonexis) A. d'Orbigny, 1835 accepted as Tremoctopus delle Chiaje, 1830
    1. Species Octopus (Philonexis) atlanticus A. d'Orbigny, 1834 accepted as Octopus atlanticus A. d'Orbigny, 1834 accepted as Tremoctopus violaceus Delle Chiaje, 1830 (unaccepted > superseded combination)
    2. Species Octopus (Philonexis) brevipes A. d'Orbigny, 1834 accepted as Octopus brevipes A. d'Orbigny, 1834
    3. Species Octopus (Philonexis) eylais A. d'Orbigny, 1834 accepted as Cranchia scabra Leach, 1817 (junior subjective synonym)
    4. Species Octopus (Philonexis) minimus A. d'Orbigny, 1834 accepted as Argonauta hians [Lightfoot], 1786 (unaccepted > junior subjective synonym)
    5. Species Octopus (Philonexis) quoyanus A. d'Orbigny, 1834 accepted as Tremoctopus violaceus Delle Chiaje, 1830 (synonym)
78. Species Octopus abaculus Norman & Sweeney, 1997 accepted as Abdopus abaculus (Norman & Sweeney, 1997) (original combination)
79. Species Octopus aculeatus A. d'Orbigny, 1834 accepted as Abdopus aculeatus (A. d'Orbigny, 1834) (superseded combination)
80. Species Octopus adamsi Benham, 1944 accepted as Octopus huttoni (Benham, 1943) accepted as Robsonella huttoni Benham, 1943
81. Species Octopus aegina J. E. Gray, 1849 accepted as Amphioctopus aegina (J. E. Gray, 1849) (unaccepted > superseded combination)
82. Species Octopus albus Rafinesque, 1814 accepted as Octopus vulgaris Cuvier, 1797
83. Species Octopus alderii Vérany, 1851 accepted as Callistoctopus macropus (Risso, 1826) accepted as Pinnoctopus macropus (Risso, 1826) (synonym)
84. Species Octopus aldrovandi delle Chiaje, 1830 accepted as Eledone cirrhosa (Lamarck, 1798) (unaccepted > junior subjective synonym)
85. Species Octopus alpheus Norman, 1993 accepted as Pinnoctopus alpheus (Norman, 1993) (unaccepted > superseded combination)
86. Species Octopus apollyon (S. S. Berry, 1912) accepted as Enteroctopus dofleini (Wülker, 1910)
87. Species Octopus arcticus Prosch, 1849 accepted as Bathypolypus arcticus (Prosch, 1849)
88. Species Octopus areolatus de Haan, 1839-1841 accepted as Amphioctopus fangsiao (A. d'Orbigny, 1841) (junior subjective synonym)
89. Species Octopus aspilosomatis Norman, 1993 accepted as Pinnoctopus aspilosomatis (Norman, 1993) (unaccepted > superseded combination)
90. Species Octopus atlanticus A. d'Orbigny, 1834 accepted as Tremoctopus violaceus Delle Chiaje, 1830 (synonym)
91. Species Octopus backerii A. d'Orbigny, 1826 accepted as Octopus bakerii A. d'Orbigny, 1826 accepted as Octopus americanus Froriep, 1806 (unaccepted > misspelling - incorrect original spelling)
92. Species Octopus bairdii A. E. Verrill, 1872 accepted as Bathypolypus bairdii (A. E. Verrill, 1872) (unaccepted > superseded combination)
93. Species Octopus bakerii A. d'Orbigny, 1826 accepted as Octopus americanus Froriep, 1806 (unaccepted > junior subjective synonym)
94. Species Octopus bermudensis Hoyle, 1885 accepted as Callistoctopus furvus (A. Gould, 1852) (synonym)
95. Species Octopus bitentaculatus Risso, 1854 accepted as Octopus vulgaris Cuvier, 1797
96. Species Octopus brevitentaculatus Blainville, 1826 accepted as Octopus vulgaris Cuvier, 1797
97. Species Octopus brocki Ortmann, 1888 accepted as Amphioctopus fangsiao (A. d'Orbigny, 1841) (synonym)
98. Species Octopus bunurong Stranks, 1990 accepted as Callistoctopus bunurong (Stranks, 1990) (original combination)
99. Species Octopus burryi G. L. Voss, 1950 accepted as Amphioctopus burryi (G. L. Voss, 1950) (unaccepted > superseded combination)
100. Species Octopus campbelli (E. A. Smith, 1902) accepted as Robsonella campbelli (E. A. Smith, 1902) (unaccepted > superseded combination)
101. Species Octopus carenae Vérany, 1839 accepted as Ocythoe tuberculata Rafinesque, 1814 (synonym)
102. Species Octopus carolinensis A. E. Verrill, 1884 accepted as Amphioctopus carolinensis (A. E. Verrill, 1884) (unaccepted > superseded combination)
103. Species Octopus cassiopea Gray, 1849 accepted as Octopus vulgaris Cuvier, 1797 (synonym)
104. Species Octopus cassiopeia Gray, 1849 accepted as Octopus cassiopea Gray, 1849 accepted as Octopus vulgaris Cuvier, 1797 (incorrect subsequent spelling of specific epithet)
105. Species Octopus catenulatus R. A. Philippi, 1844 accepted as Ocythoe tuberculata Rafinesque, 1814 (unaccepted > junior subjective synonym)
106. Species Octopus chromatus Heilprin, 1888 accepted as Callistoctopus furvus (A. Gould, 1852) (synonym)
107. Species Octopus cirrhosus Lamarck, 1798 accepted as Eledone cirrhosa (Lamarck, 1798) (original combination)
108. Species Octopus cocco Risso, 1854 accepted as Scaeurgus unicirrhus (Delle Chiaje, 1841) (junior synonym)
109. Species Octopus cocco Vérany, 1846 accepted as Pteroctopus tetracirrhus (Delle Chiaje, 1830)
110. Species Octopus coerulescentes Fra Piero, 1895 accepted as Octopus vulgaris Cuvier, 1797
111. Species Octopus communis J. Park, 1885 accepted as Macroctopus maorum (F. W. Hutton, 1880) (synonym)
112. Species Octopus cordiformis Quoy & Gaimard, 1832 accepted as Pinnoctopus cordiformis (Quoy & Gaimard, 1832) (unaccepted > superseded combination)
113. Species Octopus cuvieri A. d'Orbigny, 1826 accepted as Callistoctopus lechenaultii (A. d'Orbigny, 1826) (unaccepted > junior subjective synonym)
114. Species Octopus dana G. C. Robson, 1929 accepted as Octopus defilippi var. dama G. C. Robson, 1929 accepted as Macrotritopus defilippi (Vérany, 1851) (unaccepted > misspelling - incorrect subsequent spelling)
115. Species Octopus defilippi Vérany, 1851 accepted as Macrotritopus defilippi (Vérany, 1851) (unaccepted > superseded combination)
116. Species Octopus didynamus Rafinesque, 1814 accepted as Callistoctopus macropus (Risso, 1826) accepted as Pinnoctopus macropus (Risso, 1826) (synonym)
117. Species Octopus dierythraeus Norman, 1993 accepted as Pinnoctopus dierythraeus (Norman, 1993) (unaccepted > superseded combination)
118. Species Octopus digueti Perrier & Rochebrune, 1894 accepted as Paroctopus digueti (Perrier & Rochebrune, 1894)
119. Species Octopus dofleini (Wülker, 1910) accepted as Enteroctopus dofleini (Wülker, 1910)
120. Species Octopus dollfusi G. C. Robson, 1928 accepted as Amphioctopus aegina (J. E. Gray, 1849) (unaccepted > junior subjective synonym)
121. Species Octopus duplex Hoyle, 1885 accepted as Octopus superciliosus Quoy & Gaimard, 1832
122. Species Octopus equivocus G. C. Robson, 1929 accepted as Macrotritopus equivocus (G. C. Robson, 1929) (unaccepted > superseded combination)
123. Species Octopus ergasticus P. Fischer & H. Fischer, 1892 accepted as Bathypolypus ergasticus (P. Fischer & H. Fischer, 1892)
124. Species Octopus eudora J. E. Gray, 1849 accepted as Octopus americanus Froriep, 1806 (unaccepted > junior subjective synonym)
125. Species Octopus exannulatus Norman, 1993 accepted as Amphioctopus exannulatus (Norman, 1993) (original combination)
126. Species Octopus eylais A. d'Orbigny, 1834 accepted as Cranchia scabra Leach, 1817 (unaccepted > junior subjective synonym)
127. Species Octopus fangsiao A. d'Orbigny, 1841 accepted as Amphioctopus fangsiao (A. d'Orbigny, 1841) (unaccepted > superseded combination)
128. Species Octopus fasciatus (Hoyle, 1886) accepted as Hapalochlaena fasciata (Hoyle, 1886)
129. Species Octopus filosus Howell, 1868 accepted as Octopus hummelincki Adam, 1936 (ICZN decision (opinion 2147, 2006) suppressed this species name)
130. Species Octopus fimbriatus Ruppel, 1841 accepted as Abdopus horridus (A. d'Orbigny, 1826) (junior subjective synonym)
131. Species Octopus flindersi Cotton, 1932 accepted as Macroctopus maorum (F. W. Hutton, 1880) (synonym)
132. Species Octopus fontanianus A. d'Orbigny, 1834 accepted as Robsonella fontaniana (A. d'Orbigny, 1834) (original combination)
133. Species Octopus frayedus Rafinesque, 1814 accepted as Callistoctopus macropus (Risso, 1826) accepted as Pinnoctopus macropus (Risso, 1826) (synonym)
134. Species Octopus furvus Gould, 1852 accepted as Callistoctopus furvus (A. Gould, 1852) (original combination)
135. Species Octopus geryonea J. E. Gray, 1849 accepted as Octopus americanus Froriep, 1806 (unaccepted > junior subjective synonym)
136. Species Octopus gibbsi O'Shea, 1999 accepted as Octopus tetricus A. Gould, 1852
137. Species Octopus gilbertianus (S. S. Berry, 1912) accepted as Enteroctopus dofleini (Wülker, 1910)
138. Species Octopus glaber Wülker, 1920 accepted as Octopus cyanea Gray, 1849
139. Species Octopus gracilis Souleyet, 1852 accepted as Tremoctopus gracilis (Souleyet, 1852) (original combination)
140. Species Octopus gracilis A. E. Verrill, 1884 accepted as Macrotritopus equivocus (G. C. Robson, 1929) (unaccepted > junior homonym, not Octopus gracilis Souleyet, 1852; replaced by Octopus (Macrotritopus) equivocus G. C. Robson, 1929)
141. Species Octopus granosus Blainville, 1826 accepted as Callistoctopus macropus (Risso, 1826) accepted as Pinnoctopus macropus (Risso, 1826) (synonym)
142. Species Octopus granulatus Lamarck, 1798 accepted as Amphioctopus granulatus (Lamarck, 1798) (original combination)
143. Species Octopus graptus Norman, 1993 accepted as Pinnoctopus graptus (Norman, 1993) (unaccepted > superseded combination)
144. Species Octopus groenlandicus Dewhurst, 1856 accepted as Bathypolypus arcticus (Prosch, 1849) (synonym)
145. Species Octopus guangdongensis Z.-Z. Dong, 1976 accepted as Abdopus guangdongensis (Z.-Z. Dong, 1976) (original combination)
146. Species Octopus hardwickei J. E. Gray, 1849 accepted as Amphioctopus aegina (J. E. Gray, 1849) (unaccepted > junior subjective synonym)
147. Species Octopus harmandi Rochebrune, 1882 accepted as Abdopus aculeatus (A. d'Orbigny, 1834) (synonym)
148. Species Octopus herdmani Hoyle, 1904 accepted as Octopus cyanea Gray, 1849
149. Species Octopus heteropus Rafinesque, 1814 accepted as Octopus vulgaris Cuvier, 1797
150. Species Octopus horridus A. d'Orbigny, 1826 accepted as Abdopus horridus (A. d'Orbigny, 1826) (original combination)
151. Species Octopus horsti Joubin, 1898 accepted as Octopus cyanea Gray, 1849 (junior synonym)
152. Species Octopus hoylei (S. S. Berry, 1909) accepted as Pteroctopus hoylei (S. S. Berry, 1909)
153. Species Octopus huttoni (Benham, 1943) accepted as Robsonella huttoni Benham, 1943
154. Species Octopus hyalinus A. d'Orbigny, 1835 accepted as Tremoctopus violaceus Delle Chiaje, 1830 (unaccepted > junior subjective synonym)
155. Species Octopus indicus A. d'Orbigny, 1835 accepted as Cistopus indicus (A. d'Orbigny, 1835) (unaccepted > superseded combination)
156. Species Octopus januarii Hoyle, 1885 accepted as Muusoctopus januarii (Hoyle, 1885)
157. Species Octopus kagoshimensis Ortmann, 1888 accepted as Amphioctopus kagoshimensis (Ortmann, 1888) (original combination)
158. Species Octopus kempi (G. C. Robson, 1929) accepted as Macrotritopus defilippi (Vérany, 1851) (unaccepted > junior subjective synonym)
159. Species Octopus kermadecensis (S. S. Berry, 1914) accepted as Pinnoctopus kermadecensis (S. S. Berry, 1914)
160. Species Octopus koellikeri Vérany, 1851 accepted as Tremoctopus violaceus Delle Chiaje, 1830 (synonym)
161. Species Octopus lechenaultii A. d'Orbigny, 1826 accepted as Callistoctopus lechenaultii (A. d'Orbigny, 1826) (original combination)
162. Species Octopus leioderma (S. S. Berry, 1911) accepted as Benthoctopus leioderma (S. S. Berry, 1911) accepted as Muusoctopus leioderma (S. S. Berry, 1911)
163. Species Octopus lentus A. E. Verrill, 1880 accepted as Bathypolypus bairdii (A. E. Verrill, 1872) (unaccepted > junior subjective synonym)
164. Species Octopus leschenaultii [sic] accepted as Octopus lechenaultii A. d'Orbigny, 1826 accepted as Callistoctopus lechenaultii (A. d'Orbigny, 1826) (misspelling)
165. Species Octopus leucoderma San Giovanni, 1829 accepted as Eledone leucoderma (San Giovanni, 1829)
166. Species Octopus levis Hoyle, 1885 accepted as Muusoctopus levis (Hoyle, 1885) (original combination)
167. Species Octopus lobensis Castellanos & Menni, 1969 accepted as Octopus tehuelchus A. d'Orbigny, 1835
168. Species Octopus lothei Chun, 1913 accepted as Bathypolypus ergasticus (P. Fischer & H. Fischer, 1892)
169. Species Octopus lunulatus Quoy & Gaimard, 1832 accepted as Hapalochlaena lunulata (Quoy & Gaimard, 1832) (original combination)
170. Species Octopus luteus (Sasaki, 1929) accepted as Callistoctopus luteus (Sasaki, 1929)
171. Species Octopus macropodus San Giovanni, 1829 accepted as Callistoctopus macropus (Risso, 1826) accepted as Pinnoctopus macropus (Risso, 1826) (synonym)
172. Species Octopus macropus Risso, 1826 (unaccepted > superseded combination)
173. Species Octopus maculatus Rafinesque, 1814 (unaccepted)
174. Species Octopus maculosus Hoyle, 1883 (unaccepted, original combination)
175. Species Octopus magnificus Villanueva, P. Sánchez & Compagno Roeleveld, 1992 (unaccepted, original combination)
176. Species Octopus maorum F. W. Hutton, 1880 (unaccepted, superseded combination)
177. Species Octopus marginatus Taki, 1964 (unaccepted, original combination)
178. Species Octopus marmoratus Hoyle, 1885 (unaccepted)
179. Species Octopus megalocyathus A. Gould, 1852 (unaccepted, original combination)
180. Species Octopus megalops (Taki, 1964) (unaccepted, synonym)
181. Species Octopus membranaceus Quoy & Gaimard, 1832 (unaccepted, original combination)
182. Species Octopus mercatoris Adam, 1937 (unaccepted)
183. Species Octopus mernoo O'Shea, 1999 (unaccepted, original combination)
184. Species Octopus microstomus Reynaud, 1830 (unaccepted, synonym)
185. Species Octopus minimus A. d'Orbigny, 1834 (unaccepted > junior subjective synonym)
186. Species Octopus moschatus Rafinesque, 1814 (unaccepted)
187. Species Octopus moschatus Lamarck, 1798 (unaccepted, original combination)
188. Species Octopus mototi Norman, 1993 (unaccepted, original combination)
189. Species Octopus neglectus Nateewathana & Norman, 1999 (unaccepted, original combination)
190. Species Octopus nierstraszi Adam, 1938 (unaccepted, original combination)
191. Species Octopus nierstrazi [sic] (unaccepted, misspelling)
192. Species Octopus niger Risso, 1854 (unaccepted, dubious synonym)
193. Species Octopus niger Rafinesque, 1814 (unaccepted)
194. Species Octopus nocturnus Norman & Sweeney, 1997 (unaccepted, original combination)
195. Species Octopus obesus A. E. Verrill, 1880 (unaccepted > junior subjective synonym)
196. Species Octopus ocellatus Gray, 1849 (unaccepted, synonym)
197. Species Octopus octopodia Tryon, 1879 (unaccepted)
198. Species Octopus ornatus A. Gould, 1852 (unaccepted > superseded combination)
199. Species Octopus ovulum Sasaki, 1917 (unaccepted)
200. Species Octopus patagonicus Lönnberg, 1898 (unaccepted)
201. Species Octopus pictus Brock, 1882 (unaccepted, Invalid: junior homonym of Octopus pictus Blainville, 1826)
202. Species Octopus pictus A. E. Verrill, 1883 (unaccepted, Invalid: junior homonym Octopus pictus Blainville, 1826; O. verrilli is a replacement name)
203. Species Octopus pilosus Risso, 1826 (unaccepted)
204. Species Octopus piscatorum A. E. Verrill, 1879 (unaccepted > junior subjective synonym)
205. Species Octopus polyzenia J. E. Gray, 1849 (unaccepted > superseded combination)
206. Species Octopus pulcher Brock, 1887 (unaccepted, original combination)
207. Species Octopus punctatus Gabb, 1862 (unaccepted)
208. Species Octopus pustulosus Sasaki, 1920 (unaccepted, Invalid: junior homonym of Octopus pustulosus Blainville, 1826; O. madokai is a replacement name)
209. Species Octopus quoyanus A. d'Orbigny, 1834 (unaccepted > junior subjective synonym)
210. Species Octopus rabassin Risso, 1854 (unaccepted)
211. Species Octopus rapanui G. L. Voss, 1979 (unaccepted > superseded combination)
212. Species Octopus reticularis Petagna [in Monticelli], 1828 (unaccepted, synonym)
213. Species Octopus rex Nateewathana & Norman, 1999 (unaccepted, original combination)
214. Species Octopus robsoni Adam, 1941 (unaccepted)
215. Species Octopus robustus Brock, 1887 (unaccepted)
216. Species Octopus roosevelti Stuart, 1941 (unaccepted)
217. Species Octopus ruber Rafinesque, 1814 (unaccepted)
218. Species Octopus rufus Risso, 1854 (unaccepted, dubious synonym)
219. Species Octopus rugosus (Bosc, 1792) (unaccepted)
220. Species Octopus salebrosus (Sasaki, 1920) (unaccepted)
221. Species Octopus saluzzii Naef, 1923 (unaccepted)
222. Species Octopus saluzzii Vérany, 1840 (unaccepted, synonym)
223. Species Octopus scorpio (S. S. Berry, 1920) (unaccepted)
224. Species Octopus semipalmatus R. Owen, 1836 (unaccepted, synonym)
225. Species Octopus siamensis Nateewathana & Norman, 1999 (unaccepted, original combination)
226. Species Octopus smedleyi G. C. Robson, 1932 (unaccepted > junior subjective synonym)
227. Species Octopus sponsalis P. Fischer & H. Fischer, 1892 (unaccepted)
228. Species Octopus striolatus Z.-Z. Dong, 1976 (unaccepted, synonym)
229. Species Octopus taprobanensis G. C. Robson, 1926 (unaccepted > superseded combination)
230. Species Octopus tenebricus E. A. Smith, 1884 (unaccepted > superseded combination)
231. Species Octopus tenuicirrus (Sasaki, 1929) (unaccepted)
232. Species Octopus tetracirrhus Delle Chiaje, 1830 (unaccepted, original combination)
233. Species Octopus tetradynamus Rafinesque, 1814 (unaccepted)
234. Species Octopus titanotus (Troschel, 1857) (unaccepted > junior subjective synonym)
235. Species Octopus tonganus Hoyle, 1885 (unaccepted, original combination)
236. Species Octopus tritentaculatus Risso, 1854 (unaccepted)
237. Species Octopus troscheli Targioni-Tozzetti, 1869 (unaccepted)
238. Species Octopus troschelii Targioni-Tozzetti, 1869 (unaccepted, dubious synonym)
239. Species Octopus tuberculatus Risso, 1854 (unaccepted, junior synonym)
240. Species Octopus tuberculatus Targioni-Tozzetti, 1869 (unaccepted)
241. Species Octopus tuberculatus Blainville, 1826 (unaccepted, synonym)
242. Species Octopus unicirrhus Delle Chiaje, 1841 (unaccepted, superseded combination)
243. Species Octopus varunae Oommen, 1971 (unaccepted, original combination)
244. Species Octopus velatus Rang, 1837 (unaccepted, synonym)
245. Species Octopus velifer A. Férussac, 1835 (unaccepted > junior subjective synonym)
246. Species Octopus veranyi R. Wagner, 1828 (unaccepted, synonym)
247. Species Octopus vincenti Pickford, 1955 (unaccepted)
248. Species Octopus violaceus Risso, 1854 (unaccepted, junior synonym)
249. Species Octopus westerniensis A. d'Orbigny, 1834 (unaccepted)
250. Species Octopus winckworthi G. C. Robson, 1926 (unaccepted > superseded combination)
251. Subgenus Octopus (Octopus) Cuvier, 1798 (alternative representation)
     1. Species Octopus (Octopus) joubini G. C. Robson, 1929 represented as Octopus joubini G. C. Robson, 1929
     2. Species Octopus (Octopus) teuthoides G. C. Robson, 1929 (uncertain > nomen dubium)
252. Species Octopus alatus (Sasaki, 1920) (uncertain > taxon inquirendum)
253. Species Octopus alberti Joubin, 1895 (uncertain > nomen dubium)
254. Species Octopus amboinensis Brock, 1887 (uncertain > nomen dubium)
255. Species Octopus aranea A. d'Orbigny, 1834 (uncertain > taxon inquirendum)
256. Species Octopus araneoides Taki, 1964 (uncertain > taxon inquirendum)
257. Species Octopus arborescens (Hoyle, 1904) (uncertain > taxon inquirendum)
258. Species Octopus bandensis Hoyle, 1885 (uncertain > nomen dubium)
259. Species Octopus brevipes A. d'Orbigny, 1834 (uncertain > nomen dubium)
260. Species Octopus caerulescens Blainville, 1826 (uncertain > nomen dubium)
261. Species Octopus capensis Souleyet, 1852 (uncertain > nomen dubium)
262. Species Octopus cephea Gray, 1849 (uncertain > taxon inquirendum)
263. Species Octopus chuni Grimpe, 1922 (uncertain > taxon inquirendum)
264. Species Octopus ciliatus Rang, 1837 (uncertain > taxon inquirendum)
265. Species Octopus cornutus Owen, 1881 (uncertain > nomen dubium)
266. Species Octopus dubius Souleyet, 1852 (uncertain > nomen dubium)
267. Species Octopus elegans Brock, 1887 (uncertain > nomen dubium)
268. Species Octopus filamentosus Blainville, 1826 (uncertain > taxon inquirendum)
269. Species Octopus fujitai (Sasaki, 1929) (uncertain > taxon inquirendum)
270. Species Octopus fusiformis Brock, 1887 (uncertain > nomen dubium)
271. Species Octopus globosus Appellöf, 1886 (uncertain > taxon inquirendum)
272. Species Octopus hoeki Joubin, 1898 (uncertain > taxon inquirendum)
273. Species Octopus hyadesi Rochebrune & Mabille, 1889 (uncertain > nomen dubium)
274. Species Octopus incertus Targioni-Tozzetti, 1869 (uncertain > nomen dubium)
275. Species Octopus inconspicuus Brock, 1887 (uncertain > taxon inquirendum)
276. Species Octopus longispadiceus (Sasaki, 1917) (uncertain > taxon inquirendum)
277. Species Octopus machikii Brock, 1887 (uncertain > nomen dubium)
278. Species Octopus madokai S. S. Berry, 1921 (uncertain > taxon inquirendum)
279. Species Octopus medoria Gray, 1849 (uncertain > taxon inquirendum)
280. Species Octopus mollis Gould, 1852 (uncertain > nomen dubium)
281. Species Octopus monterosatoi Fra Piero, 1895 (uncertain > taxon inquirendum)
282. Species Octopus moschites Carus, 1824 (uncertain > taxon inquirendum, Unresolved species of Eledone)
283. Species Octopus nanhaiensis Z.-Z. Dong, 1976 (uncertain > taxon inquirendum)
284. Species Octopus niveus R. P. Lesson, 1830 (uncertain > taxon inquirendum)
285. Species Octopus ochotensis (Sasaki, 1920) (uncertain > taxon inquirendum)
286. Species Octopus oshimai (Sasaki, 1929) (uncertain > taxon inquirendum)
287. Species Octopus pentherinus Rochebrune & Mabille, 1889 (uncertain > nomen dubium)
288. Species Octopus peronii Lesueur, 1821 (uncertain > taxon inquirendum)
289. Species Octopus pictus Blainville, 1826 (uncertain > nomen dubium)
290. Species Octopus prashadi Adam, 1939 (uncertain > taxon inquirendum)
291. Species Octopus pricei (S. S. Berry, 1913) (uncertain > taxon inquirendum)
292. Species Octopus pusillus A. Gould, 1852 (uncertain > nomen dubium)
293. Species Octopus pustulosus Blainville, 1826 (uncertain > nomen dubium)
294. Species Octopus saphenia Gray, 1849 (uncertain > taxon inquirendum)
295. Species Octopus sasakii Taki, 1942 (uncertain > taxon inquirendum)
296. Species Octopus spinosus Sasaki, 1920 (uncertain > taxon inquirendum)
297. Species Octopus tenuipulvinus Sasaki, 1920 (uncertain > taxon inquirendum)
298. Species Octopus teuthoides G. C. Robson, 1929 (uncertain > nomen dubium)
299. Species Octopus tsugarensis Sasaki, 1920 (uncertain > taxon inquirendum)
300. Species Octopus validus Sasaki, 1920 (uncertain > taxon inquirendum)
301. Species Octopus variabilis (Sasaki, 1929) (uncertain > taxon inquirendum)
302. Species Octopus variolatus Blainville, 1826 (uncertain > nomen dubium)
303. Species Octopus ventricosus R. E. Grant, 1827 (uncertain > taxon inquirendum)
304. Species Octopus venustus Rang, 1837 (uncertain > taxon inquirendum)
305. Species Octopus verrilli Hoyle, 1886 (uncertain > nomen dubium)
306. Species Octopus yendoi (Sasaki, 1920) (uncertain > taxon inquirendum)

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