The Diocese of Quimper is a Roman Catholic diocese located in Brittany, France. It was established in the 5th century and is part of the ecclesiastical province of Rennes. The diocese covers the area of Finistère and is known for its rich history and cultural heritage, including numerous churches and religious sites. The diocese's seat is the Cathedral of Saint Corentin, which is an important landmark in the city of Quimper. The diocese is dedicated to the spiritual care of its parishioners and plays a significant role in the local community, promoting various religious and social activities.