Humbert of Maroilles was a Frankish monk, abbot, and saint. He founded Maroilles Abbey. Humbert was born at Mézières-sur-Oise to the noble parents Evrard and Popita in the early 7th century. He trained as a Benedictine monk in Laon, and his family anticipated that he was destined for a successful career as a bishop. Upon the death of his parents, he returned to his estates in Mézières Sur Oise to settle some inheritance issues. The fine food, comfortable accommodations, servants, hunting, and other distractions turned his mind away from monastic life. He spent many years there.
Once Bishop Amandus took him on a pilgrimage to Rome. Humbert became a disciple and companion of the missionary bishop. He was also a friend of the abbess Aldegundis.
Later, Pope Martin I ordained him a missionary bishop; he worked mainly in the Low Countries.
In 652, he co-founded and became the first abbot of a monastery of Maroilles Abbey. On his second trip to Rome, he returned with relics and a statuette of the Virgin Mary, whom he named patroness of the abbey church under the title Maroilles Notre Dame des Affliges.
He died at Maroilles around the year 682. Saint Curcodomus succeeded him as abbot. Buildings of this monastery are still present there, although the abbey was ruined in the course of the French Revolution.