The Diocese of Bayeux and Lisieux (Latin: Dioecesis Baiocensis et Lexoviensis; French: Diocèse de Bayeux et Lisieux) is a Latin Church diocese of the Catholic Church in France. It is coextensive with the Department of Calvados and is a suffragan to the Archdiocese of Rouen, also in Normandy.
With the Concordat of 1802, the former Diocese of Lisieux was merged with that of Bayeux. A pontifical brief in 1854 authorized the Bishop of Bayeux to call himself Bishop of Bayeux and Lisieux.
Odo of Bayeux (died 1097) was a Norman nobleman who was a bishop of Bayeux in Normandy and was made Earl of Kent in England following the Norman Conquest. He was the maternal half-brother of duke, and later king, William the Conqueror, and was, for a time, William's primary administrator in the Kingdom of England, although he was eventually tried for defrauding William's government. It is likely Odo commissioned the Bayeux Tapestry, a large tableau of the Norman Conquest, perhaps to present to his brother William. He later fell out with his brother over Odo's support for military adventures in Italy. William, on his deathbed, freed Odo. Odo died in Palermo, Sicily, on the way to crusade.
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 bishopric was suppressed during the French Revolution and was not reinstated. Present day Lisieux is part of the Diocese of Bayeux.