Marcantonio Giustinian (March 2, 1619 – March 23, 1688) was the 107th Doge of Venice, reigning from his election on January 26, 1684 until his death.
Giustiniani was the quintessential Doge of the Republic of Venice, taking little interest in affairs of state.
He had little role in the conduct of the Morean War (1684-1699), which was raging during his time as Doge, though a number of military victories were secured by provveditore Francesco Morosini, who would later be Giustinian's successor as Doge.