Saint-Martin-sur-Oust (, literally ''Saint-Martin on
Oust
The Oust (; br, Oud) is a river in Brittany, France, right tributary of the Vilaine. It is long. Its source is in the hills between Corlay and Quintin. It flows generally southeast, through the following ''départements'' and towns:
* Côtes ...
''; br, Sant-Varzhin-an-Oud) is a
commune
A commune is an alternative term for an intentional community. Commune or comună or comune or other derivations may also refer to:
Administrative-territorial entities
* Commune (administrative division), a municipality or township
** Communes of ...
in the
Morbihan
Morbihan ( , ; br, Mor-Bihan ) is a department in the administrative region of Brittany, situated in the northwest of France. It is named after the Morbihan (''small sea'' in Breton), the enclosed sea that is the principal feature of the coastli ...
Brittany
Brittany (; french: link=no, Bretagne ; br, Breizh, or ; Gallo language, Gallo: ''Bertaèyn'' ) is a peninsula, Historical region, historical country and cultural area in the west of modern France, covering the western part of what was known ...
in north-western
France
France (), officially the French Republic ( ), is a country primarily located in Western Europe. It also comprises of Overseas France, overseas regions and territories in the Americas and the Atlantic Ocean, Atlantic, Pacific Ocean, Pac ...
. Until 6 October 2008 it was known as Saint-Martin.INSEE commune file /ref> Inhabitants of Saint-Martin-sur-Oust are called in French ''Martinais''.