Sinum nolani (FOSSIL) C.J. Maury, 1917 †
Pliconacca nomii (FOSSIL) T. Nagao, 1928 †
Bulbus normalis (A.T. von Middendorff,1851)
Euspira notabilis (J.G. Jeffreys, 1885)
Taniella notocenica (FOSSIL) (Finlay, 1924 †)
Amauropsis notoleptos (FOSSIL) J.D. Stilwell & al.,2004 †
Falsilunatia notorcadensis R.K. Dell, 1990
Sinum noyesii W.H. Dall, 1903
Payraudeautia nubila (W.H. Dall, 1889)
Euspira nuciformis (FOSSIL) W.M. Gabb, 1864 †
Magnatica nuda (FOSSIL) (J. Marwick, 1924 †)
Euspira nux (T.A. Okutani, 1964)
Euspira nysti (FOSSIL) (A.V.M.D. D'Orbigny,1852 †)
Natica obliqua (FOSSIL) J. Price, 1874 †
Natica obliquistriata E. Forbes, 1846
Sinum obliquum (FOSSIL) W.M. Gabb, 1864 †
Natica obscura (FOSSIL) Sowerby, 1840 †
Polinices obstructus (FOSSIL) (J. Marwick, 1924 †)
Euspira obtusa (J.G. Jeffreys, 1885)
Natica occlusa (FOSSIL) S.V. Wood †
Amauropsis odhneri (FOSSIL) Harmer †
Natica oeyenhausii (FOSSIL) Klipstein, 1843 †
Calinaticina oldroydii (W.H. Dall, 1897)
Sinum oligopolitum (FOSSIL) (F. Sacco, 1890 †)
Neverita olla (FOSSIL) M. de Serres, 1829 †
Neverita olla subglaucinoides (FOSSIL) A.V.M.D. D'Orbigny,1852 †
Microlinices ombratus L.R.L. Simone, 2014
Natica omoia J.F. Mabille& A. de Rochebrune, 1885
Naticarius onca (P.F. Röding, 1798)
Polinices oneroaensis (FOSSIL) Powell & J.A. Bartrum,1929 †
Polinices onustus (FOSSIL) (R.P. Whitfield, 1865 †)
Cryptonatica operculata (J.G. Jeffreys, 1885)
Cryptonatica oregonensis (FOSSIL) (T.A. Conrad, 1849 †)
Naticarius orientalis (J.F. Gmelin, 1791)
Polinices ortmanni (FOSSIL) H.F.A. von Ihering,1907 †