Bains-sur-Oust (, literally Bains on Oust; , Gallo: Bein) is a commune in the Ille-et-Vilaine departement in Brittany in northwestern France. Population Inhabitants of Bains-sur-Oust are called Bainsois in French. Personalities Nominoe, first Duke of Brittany See also Communes of the Ille-et-Vilaine department References External links Official website Mayors of Ille-et-Vilaine Association Communes of Ille-et-Vilaine