Boniface of Montferrat (c. 1150 – 4 September 1207) is Marquess of Montferrat and the leader of the Fourth Crusade.

He is the third son of William V of Montferrat and Judith of Babenberg, born after his father's return from the Second Crusade.

He is a younger brother of William 'Longsword', Count of Jaffa and Ascalon, and of Conrad I of Jerusalem.