The Cathédrale Saint-Corentin is a Roman Catholic cathedral located in the city of Quimper, in the Brittany region of France. The cathedral is named after Saint Corentin, the first bishop of Quimper.

Construction of the cathedral began in the 13th century, and the building was expanded and modified over the centuries. The cathedral features a mixture of architectural styles, including Romanesque, Gothic, and Renaissance elements. The cathedral's west facade is particularly notable for its elaborate decoration and sculpture, including a depiction of the Last Judgment above the portal.

Inside, the cathedral features a large nave with soaring columns and arches, as well as a number of chapels and side altars. The cathedral's interior is decorated with beautiful stained glass windows, many of which date back to the 15th and 16th centuries.

One of the most famous features of the cathedral is its large organ, which was built in the early 19th century and is considered one of the finest organs in France. The organ has been played by a number of famous musicians over the years, including Louis Vierne and Marcel Dupré.