Trédarzec (French pronunciation: [tʁedaʁzɛk] ⓘ; Breton: Tredarzeg) is a commune in the Côtes-d'Armor department of Brittany in northwestern France.

The name is treb = farmstead, tarz = spring.

Inhabitants of Trédarzec are called trédarzécois in French.

Trédarzec is twinned with the village of St. Dogmaels in Pembrokeshire, Wales.

This Côtes-d'Armor geographical article is a stub.