Bains-sur-Oust (French pronunciation: [bɛ̃ syʁ ust], literally Bains on Oust; Breton: Baen-Ballon, Gallo: Bein) is a commune in the Ille-et-Vilaine departement in Brittany in northwestern France.

Inhabitants of Bains-sur-Oust are called Bainsois in French.

This Ille-et-Vilaine geographical article is a stub.

You can help Wikipedia by expanding it.