Belley Cathedral (French: Cathédrale Saint-Jean de Belley) is a Roman Catholic cathedral, dedicated to Saint John the Baptist, and a national monument of France, located in the town of Belley, Ain.
It is the seat of the Bishop of Belley–Ars.
It contains organs by Cavaillé-Coll.
Coordinates: 45°45′27″N 5°41′21″E / 45.75750°N 5.68917°E