Saint-Jean-de-Maurienne Cathedral is a church in Saint-Jean-de-Maurienne, Savoie, that is one of two co-cathedrals of the Roman Catholic Archdiocese of Chambéry–Saint-Jean-de-Maurienne–Tarentaise. Until 1966, it was the cathedral of the Diocese of Saint-Jean-de-Maurienne. It is dedicated to John the Baptist.