Marino Grimani (c.1489–1546) was an Italian Cardinal and papal legate. He was from an aristocratic Venetian family.
He was elected bishop of Ceneda in 1508, when he was under age. He was patriarch of Aquileia in 1517.
He was created Cardinal in 1527. He was bishop of Concordia in 1533, bishop of Città Castello in 1534, bishop of Saint Pons de Tomières, briefly, in 1534. He was bishop of Frascati in 1541, bishop of Porto e Santa Rufina in 1543.