Scaphella neptunia (W.J. Clench & C.G. Aguayo,1940)
Lyria nestor (FOSSIL) T.L. Casey, 1903 †
Fulgoraria ngocngai P. Bail & N.N. Thach,2017
Cymbiola nivosa (J.B.P.A. Lamarck, 1804)
Cymbiola nivosa oblita (E.A. Smith, 1909)
Cymbiola nobilis (J. Lightfoot, 1786)
Cymbiola nobilis octogonalis J.R. Senders, 1995
Cymbiola nobilis tamariskae Sutanto & S. Patamakanthin,2004
Livonia nodiplicata (J.C. Cox, 1910)
Volutospina nodosa (FOSSIL) (J. de C. Sowerby,1829 †)
Liopeplum nodosum (FOSSIL) N.F. Sohl, 1964 †
Alcithoe nodulifera (FOSSIL) C.R. Laws, 1935 †
Fulgoraria noguchii (S. Hayashi, 1960)
Notovoluta norwestralis P. Bail & A. Limpus, 2003
Lapparia nuda (FOSSIL) H.B. Stenzel & Turner,1940 †
Alcithoe nukumaruensis (FOSSIL) Murrdoch, 1920 †
Adelomelon obesa (FOSSIL) (R.A. Philippi, 1887 †)
Caricella obsoleta (FOSSIL) K.V.W. Palmer, 1953 †
Volutifusus obtusa (FOSSIL) (E. Emmons, 1858 †)
Notovoluta occidua B.C. Cotton, 1946
Musashia ochotensis (FOSSIL) A. Oleinik, 1991 †
Lyria ogasawarana P. Bail & M. Chino, 2015
Caricella ogilviana (FOSSIL) C.J. Maury, 1912 †
Athleta ogormani (FOSSIL) (A.E.M. Cossmann, 1923 †)
Scaphella oleiniki (FOSSIL) E.J. Petuch, 1994 †
Mauira oliveri (FOSSIL) (J. Marwick, 1926 †)
Cymbium olla (C. Linnaeus, 1758)
Athleta olssoni (FOSSIL) (Plummer, 1933 †)
Athleta olssoni gracilis (FOSSIL) Garvie, 2013 †
Pavora olssoni (FOSSIL) Clark & J.W. Durham,1946 †
Teremelon onoua (FOSSIL) J.D. Stilwell, 2016 †
Alcithoe orphanta (FOSSIL) T.A. Darragh, 1989 †
Volutilithes osmani (FOSSIL) Abbass, 1967 †
Nipponomelon otukai (FOSSIL) T. Shikama, 1967 †
Cymbium pachyus (P.M. Pallary, 1930)