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The Diocese of Quimper (–Cornouaille) and Léon (Latin: Dioecesis Corisopitensis (–Cornubiensis) et Leonensis; French: Diocèse de Quimper (–Cornouaille) et Léon) is a Latin Church ecclesiastical territory or diocese of the Catholic Church in France. In 1853, the name was changed from the Diocese of Quimper (–Cornouaille) to the Diocese of Quimper (–Cornouaille) and Léon.Originally established in the 5th century, the diocese was dismantled during the anti-clericalism of the French Revolution. It was restored by the Concordat of 1801, as the combination of the Dioceses of Quimper, Saint-Pol-de-Léon and Tréguier in Brittany, France. Traditionally, it formed part of Lower Brittany; today's diocese is coextensive with the Department of Finistère.
The diocese is a suffragan diocese in the ecclesiastical province of the metropolitan Archdiocese of Rennes, Dol, and Saint-Malo. The current bishop is Laurent Marie Bernard Dognin.