Buccio de Fidellis (died 1481) was a soldier of the Republic of Venice during the late 15th century. In 1481, he was sent to guard a bridge in Venice, and he attempted to stop Ezio Auditore da Firenze as he assisted the thief Rosa, who had been wounded by Venetian archers, in escaping to the thieves' den. Ezio engaged De Fidellis in combat, killing him so that the two could escape.