Saint-Vincent-sur-Oust (French pronunciation: [sɛ̃ vɛ̃sɑ̃ syʁ ust], literally Saint-Vincent on Oust; Breton: Sant-Visant-an-Oud) is a commune in the Morbihan department of Brittany in north-western France.

[3] The river Oust forms all of the commune's northern and eastern borders; the river Arz forms most of its south-western border.

Inhabitants of Saint-Vincent-sur-Oust are called in French Vincentais.

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