Clavilithes noae (FOSSIL) (J.B.P.A. Lamarck,1803 †)
Fusinus nobilis (L.A. Reeve, 1847)
Cryptorhytis nobilis (FOSSIL) B. Wade, 1926 †
Nodolatirus nodatus (J.F. Gmelin, 1791)
Buccinofusus nodifer (FOSSIL) Wood, 1879 †
Paleopsephaea nodoprosta (FOSSIL) J.D. Stilwell & al.,2004 †
Fusus nodosocarinatus (FOSSIL) Münster, 1841 †
Fusinus nodosoplicatus (R.W. Dunker, 1867)
Clavilithes noetlingi (FOSSIL) E.W. Vredenburg, 1925 †
Granulifusus noguchii (T. Habe & O. Masuda,1990)
Fractolatirus normalis T. Iredale, 1936
Hemipolygona nosali (FOSSIL) W.G. Lyons, 1991 †
Fusinus novaehollandiae (L.A. Reeve, 1848)
Benimakia nux P. Bouchet & M.A. Snyder,2013
Granulifusus obesus M.A. Snyder, 2013
Streptochetus obliquatus (FOSSIL) (G.P. Deshayes, 1835 †)
Fusinus oblitus (L.A. Reeve, 1847)
Falsicolus obruta (FOSSIL) Finlay, 1930 †
Graphidula obscura (FOSSIL) (B. Wade, 1926 †)
Fusus obscurus (FOSSIL) Wood, 1879 †
Leucozonia ocellata (J.F. Gmelin, 1791)
Fusinus ocelliferus (J.B.P.A. Lamarck, 1816)
Fusinus ocelliferus adamsii H.C. Küster & W. Kobelt,1876
Fusinus ocelliferus cinnamomeus L.A. Reeve, 1847
Fusinus ocelliferus robustior G.B. III Sowerby, 1880
Pustulatirus ogum (E.J. Petuch, 1979)
Fasciolaria okeechobeensis (FOSSIL) H.I. Tucker & D. Wilson,1932 †
Terebraspira okeechobeensis (FOSSIL) E.J. Petuch, 1994 †
Aptyxis okinawa (FOSSIL) F.S. MacNeil, 1960 †
Pleuroploca olssoni (FOSSIL) (Anderson, 1929 †)
Glyptostyla olssoni (FOSSIL) Clark & J.W. Durham 1946 †,
Mancorus olssoni (FOSSIL) Clark & J.W. Durham,1946 †
Fractolatirus optatus (FOSSIL) (P. Marshall& R. Murdoch, 1923 †)
Latirolagena orbignyi (FOSSIL) (L.H. Hupé, 1854 †)
Falsicolus orientalis (FOSSIL) J. Marwick, 1931 †