Otto of Montferrat explained

Otto of Montferrat may refer to:

• Otto I, Marquis of Montferrat (r. 991)
• Otto II, Marquis of Montferrat (r. 1042–1084)
• Otto III, Marquis of Montferrat, known as Secondotto (r. 1372–1378)
• Otto of Tonengo, cardinal (1227–1250)