The Diocese of Le Mans is a Roman Catholic diocese located in the region of Pays de la Loire in France. It is part of the ecclesiastical province of Rennes and has its seat in the city of Le Mans. The diocese has a rich history, dating back to the early Christian era, and is known for its significant architectural heritage, including the Saint-Julien Cathedral. The diocese serves a diverse population and is responsible for the spiritual and administrative needs of its parishes. It is involved in various social and educational initiatives, promoting the Catholic faith and community engagement throughout the region.