Belle-Isle-en-Terre (French pronunciation: [bɛl il ɑ̃ tɛʁ]; Breton: Benac'h) is a commune in the Côtes-d'Armor department of Brittany in northwestern France.

Belle isle - in modern French - Belle île meaning "beautiful island" and en Terre significate "on the ground".

Inhabitants of Belle-Isle-en-Terre are called Bellilois in French.

The municipality launched a linguistic plan through Ya d'ar brezhoneg on 26 November 2007.

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