Riez Cathedral (Cathédrale Notre-Dame-de-l'Assomption de Riez) is a Roman Catholic church located in the town of Riez in the département of Alpes-de-Haute-Provence in south-eastern France.

It is a national monument.

It was formerly the seat of the Bishopric of Riez, abolished by the Concordat of 1801, which transferred its territory to the Bishopric of Digne.

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