Antoniotto Usodimare or Usus di Mare (1416–1462) was a Genoese trader and explorer in the service of the Portuguese Prince Henry the Navigator. Jointly with Alvise Cadamosto, Usodimare discovered a great stretch of the West African coast in two known voyages in 1455 and 1456. They notably discovered the Cape Verde islands, and the Guinea coast from the Gambia River to the Geba River (in Guinea-Bissau)