Boso (Italian Bosone) was a Roman Catholic cardinal, priest of Sant'Anastasia al Palatino (1116–1122) and bishop of Turin (1122–1126×28). He was a frequent apostolic legate, making four separate trips to Spain in this capacity. In Spain he proclaimed a crusade to re-conquer the Balearics and held several synods to establish the Gregorian reforms. In Turin, he introduced the truce of God to curb private warfare.