Trémargat (French pronunciation: [tʁemaʁɡat]; Breton: Tremargad) is a commune in the Côtes-d'Armor department of Brittany in northwestern France.

People from Trémargat are called trémargatois in French and tremargadiz in Breton.

The commune's unusual demographics lend it to unusual political leanings; in the 2012 presidential election, Trémargat was one of the few communes where Eva Joly of Europe Ecology – The Greens secured a plurality of the vote, with 29.03% support, followed closely by Jean-Luc Mélenchon of the Left Front at 27.42%.

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