The Roman Catholic Diocese of Vannes (Latin: Dioecesis Venetensis; French: Diocèse de Vannes) is a diocese of the Latin Rite of the Roman Catholic Church in France. Erected in the 5th century, the Episcopal see is Vannes Cathedral in the city of Vannes. The diocese corresponds to the department of Morbihan, and is suffragan to the Archdiocese of Rennes, Dol, and Saint-Malo. Raymond Michel René Centène is the current bishop since his appointment in 2005.