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

Inhabitants of Ploumagoar are called ploumagoariens in French.

The municipality launched a linguistic plan through Ya d'ar brezhoneg on 11 February 2008.

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