Cantharus may refer to: Cantharus (Christianity), a fountain used by Christians for making ablutions Kantharos (also spelled cantharus), a Greek drinking cup Kantharos (also spelled Cantharus), an ancient Athenian comic poet Kantharos (also spelled Cantharus), a harbour in ancient Athens Sea snails in the family Pisaniidae, including: Cantharus, a genus of sea snails Common cantharus (Gemophos auritulus) Measle-mouth cantharus (Gemophos sanguinolentus) Ringed cantharus (Gemophos ringens) Tinted or painted cantharus (Gemophos tinctus) Ribbed cantharus (Hesperisternia multangula)