Montreuil-sur-Ille (French pronunciation: [mɔ̃tʁœj syʁ il], literally Montreuil on the Ille; Breton: Mousterel-an-Il; Gallo: Móstroelh) is a commune in the Ille-et-Vilaine department of Brittany in northwestern France.

The commune's name reflects its location on the Ille river.

[3] Inhabitants of Montreuil-sur-Ille are called in French Montreuillais.

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