Cantharus is a genus of sea snails in the family Pisaniidae.

[1][2] This genus was previously placed in family Fasciolariidae by some authors.

[citation needed] The genus is sometimes split into subgenera.

[2] As of 2020[update], the World Register of Marine Species accepts 14 extant and 1 extinct species in the genus Cantharus:[2] Cantharus elegans (Griffith & Pidgeon, 1834) is present in some databases,[3] but not the World Register of Marine Species.

[2] Cantharus porcatus H. Adams & A. Adams, 1864 is listed as a taxon inquirendum in the World Register of Marine Species.