Demoulia abbreviata (J.F. Gmelin, 1791)
Nassarius absconditus C. Gili, 2015
Nassarius abyssicolus (A. Adams, 1852)
Keepingia acies (FOSSIL) (A. Watelet, 1850 †)
Nassaria acmeleuca Y.C. Lee, MS
Cymatophos acolus (FOSSIL) W.P. Woodring, 1964 †
Nassarius acteon (FOSSIL) F.S. MacNeil, 1960 †
Nassaria acuminata (L.A. Reeve, 1844)
Phos acuminatus (FOSSIL) Martin, 1879 †
Nassarius acuminatus (F.P. Marrat, 1880)
Nassarius acuticostus (R.P. Montrouzier in S.M. Souverbie& R.P. Montrouzier, 1864)
Nassaria acutispirata (G.B. III Sowerby, 1913)
Nassaria acutispirata obesiformis (M. Yokoyama, 1920)
Nassarius acutus T. Say, 1822
Nassarius adami A. Arthur & F. Fernandes,1989
Nassaria adamsi J.T. Kuroda, 1961
Dorsanum aequistriatum (FOSSIL) G.F. Dollfus, 1889 †
Nassarius aethiopicus (F.P. Marrat, 1873)
Nassarius affinis (FOSSIL) (O. Böttger, 1883 †)
Nassarius agapetus (R.B. Watson, 1882)
Bullia aikeni R.N. Kilburn, 1978
Monoptygma alabamiensis (FOSSIL) I. Lea, 1833 †
Nassarius alabasteroides H.H. Kool, 2009
Antillophos alabastrum (K. Fraussen, 2003)
Phrontis alba (T. Say, 1826)
Nassarius albescens (R.W. Dunker, 1846)
Nassarius albinus (K.H.J. Thiele, 1930)
Nassarius albomaculatus H.A. Rehder, 1980
Nassarius aldrovandii (FOSSIL) (L.M.D. Bellardi, 1882 †)
Bullia alfredensis P. Bartsch, 1915
Nassarius alfuricus (H. Fischer in J. Wanner,1927)
Nassarius algidus (L.A. Reeve, 1853)
Bullia altilis (FOSSIL) (T.A. Conrad, 1832 †)
Cyllenina amaldiformis (FOSSIL) B.M. Landau & al., 2009 †
Nassarius amycliformis (FOSSIL) (T. Shuto, 1969 †)