Francesco Foscari was the 65th Doge of the Republic of Venice from 1423 to 1457. His reign, the longest of all Doges in Venetian history, lasted 34 years, 6 months and 8 days, and coincided with the inception of the Italian Renaissance.

The Doge of Venice was the highest role of authority within the Republic of Venice. The word Doge derives from the Latin Dux, meaning "leader," originally referring to any military leader, becoming in the Late Roman Empire the title for a leader of an expeditionary force formed by detachments from the frontier army, separate from, but subject to, the governor of a province, authorized to conduct operations beyond provincial boundaries.