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)

This disambiguation page lists articles associated with the title Cantharus.
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