Claviscala nodulosa T. Nakayama, 2000
Epitonium nodulosum (FOSSIL) (R.A. Philippi, 1887 †)
Amaea noguchii T. Habe & O. Masuda, 1990
Claviscala norica (FOSSIL) M. Harzhauser& B.M. Landau, 2014 †
Epitonium novangliae (J.P.Y. Couthouy, 1838)
Opalia nympha (FOSSIL) (F.W. Hutton, 1885 †)
Acirsa oamarutica (FOSSIL) (H.H. Suter, 1917 †)
Epitonium obesum (G.B. II Sowerby, 1847)
Epitonium obliquum (J. de C. Sowerby, 1844)
Nodiscala obtusicostata (FOSSIL) (Wood, 1842 †)
Epitonium obtusum (G.B. II Sowerby, 1844)
Epitonium occidentale (P. Nyst, 1871)
Epitonium octagonum (G.B. III Sowerby, 1905)
Amaea ogaitoi H. Masahito & T. Habe,1975
Amaea ojiensis (FOSSIL) (M. Yokoyama, 1927 †)
Epitonium okezoko (T. Habe, 1961)
Crisposcala okinavensis (FOSSIL) F.S. MacNeil, 1960 †
Surrepifungium oliverioi (A. Bonfitto & B. Sabelli,2001)
Epitonium opeas R.N. Kilburn, 1985
Epitonium oppositum (M.E.A. de Boury, 1921)
Epitonium optabile (A. Adams, 1873)
Amaea optata (F.P. Jousseaume, 1912)
Amaea optima (J.C. Melvill & R. Standen,1903)
Opalia ordenarum (M. Smith, 1944)
Cylindriscala orientalis (K.H.J. Thiele, 1925)
Scalaria ornata (FOSSIL) (Münster, 1841 †)
Epitonium ossium T. Nakayama, 2000
Epitonium ovale (J. de C. Sowerby, 1844)
Amaea oyasionensis (H. Ozaki, 1958)
Gregorioiscala pachya (É.A.A. Locard, 1897)
Sthenorytis pachypleura (FOSSIL) (T.A. Conrad, 1841 †)
Opalia pacoi W. Engl, 2002
Epitonium padangense (K.H.J. Thiele, 1925)
Epitonium pallasi (L.C. Kiener, 1838)
Epitonium pallasi neglectum (A. Adams & L.A. Reeve,1850)