The Archdiocese of Tarentaise was a Roman Catholic diocese and archdiocese in France, with its see in Moûtiers, in the Tarentaise Valley in Savoie. It was established as a diocese in the 5th century, elevated to archdiocese in 794, and disbanded in 1801. The diocese of Tarentaise was again formed in 1825, and united with the diocese of Chambéry and diocese of Saint-Jean-de-Maurienne to form the Archdiocese of Chambéry, Maurienne and Tarentaise in 1966.