Montreuil-sous-Pérouse (French pronunciation: [mɔ̃tʁœj su peʁuz]; Breton: Mousterel-ar-Veineg) is a commune in the Ille-et-Vilaine department in Brittany in northwestern France.

Inhabitants of Montreuil-sous-Pérouse are called Montreuillais in French.

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