The Diocese of Lisieux was a Roman Catholic ecclesiastical territory in France, centered on Lisieux, in Calvados.
The bishop of Lisieux was the Ordinary of the Roman Catholic Diocese of Lisieux. The first known Bishop of Lisieux is one Theodibandes, mentioned in connection with a council held in 538.
The bishopric was suppressed during the French revolution and was not reinstated. Present day Lisieux is part of the Diocese of Bayeux.
A list of alleged early bishops of Lisieux was included in the Ritual of Lisieux, published in 1661 under the direction of Bishop Léonor (I ) Goyon de Matignon. The list, however, was padded with the names of saints whose putative relics were stored in the Cathedral. These included Saint Ursinus, Saint Patrick and Saint Cande, none of whom can be shown to have been a bishop. The Bishop of Lisieux was ex-officio Conservator of the University of Caen.
The Chapter of the Cathedral of Saint-Pierre was composed of nine dignities and thirty Canons. The dignities were: the Dean, the Cantor, the Treasurer, the Capicerio, the Magister Scholarum, and the four Archdeacons (Lieuven, Auge, Pont-Audemer, and Gacé). All were appointed by the bishop, except the Dean, who was elected by the Chapter. There were thirty-one prebends, the first eleven of whom were called 'Barons'. The Cathedral also had four Vicars and thirty chaplains.
The diocese of Lisieux contained 487 parishes and 520 rectories. The diocese had six abbeys for men and two for women. Five of the abbeys belonged to the Order of Saint Benedict (Saint-Evroul, Bernay, Préaux, Grestain,Cormeilles). The Premonstratensians had an abbey at Mont-Dée (Mondaye). The two convents for women belonged to the Order of Saint Benedict (Saint-Léger, Saint-Désir).
A synod was held at Lisieux in 1055 by the Papal Legate, Bishop Hermanfried of Sion, with the cooperation of Duke William the Bastard (future king of England), in which Archbishop Malgerius of Rouen was deposed. His dissolute life was notorious, he had refused to attend a Roman Council though summoned, and he made rebellion against the Duke. The deposition had already been agreed to by Pope Leo IX.