The French Roman Catholic diocese of Saint-Jean-de-Maurienne has since 1966 been effectively suppressed, formally united with the archdiocese of Chambéry. While it has not been suppressed, and is supposed to be on a par with Chambéry and the diocese of Tarentaise, it no longer has a separate bishop or existence.

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.