The Diocese of Le Mans is a Latin Church diocese of the Catholic Church in France. The diocese is now a suffragan of the Archdiocese of Rennes, Dol, and Saint-Malo, but had previously been suffragan to Bourges, Paris, Sens, and Tours.

The Archdiocese of Rennes, Dol, and Saint-Malo is a Latin Church diocese of the Catholic Church in France. The diocese is coextensive with the department of Ille et Vilaine. The Archdiocese has 8 suffragans: the Diocese of Angers, the Diocese of Laval, the Diocese of Le Mans, the Diocese of Luçon, the Diocese of Nantes, the Diocese of Quimper and Léon, the Diocese of Saint-Brieuc and Tréguier, and the Diocese of Vannes.