Cléden-Cap-Sizun (French pronunciation: [kledɛ̃ kap sizœ̃]; Breton: Kledenn-ar-C'hab) is a commune in the Finistère department of Brittany in north-western France, lying on the promontory of Cap Sizun.

Inhabitants of Cléden-Cap-Sizun are called in French Clédinois.

Cléden-Cap-Sizun is twinned with Ballydehob, County Cork, Ireland.

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