Otto of Montferrat

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)