The Diocese of La Rochelle and Saintes is a Latin Church diocese of the Catholic Church in France. The diocese comprises the département of Charente-Maritime and the French overseas collectivity of Saint-Pierre and Miquelon. The bishop is a suffragan of the Archbishop of Poitiers. The episcopal seat is in La Rochelle Cathedral. Saintes Cathedral is a co-cathedral.

Saint Pierre and Miquelon, officially the Territorial Collectivity of Saint-Pierre and Miquelon, is a self-governing territorial overseas collectivity of France in the northwestern Atlantic Ocean, located near the Canadian province of Newfoundland and Labrador. An archipelago of eight islands, St. Pierre and Miquelon is a vestige of the once-vast territory of New France. Its residents are French citizens; the collectivity elects its own deputy to the National Assembly and participates in senatorial and presidential elections. It covers 242 km2 (93 sq mi) of land and had a population of 6,008 as of the March 2016 census.