Val d'Oust (French pronunciation: [val dust], literally Vale of Oust; Breton: Traoñ-an-Oud) is a commune in the Morbihan department of western France, named after the river Oust.

Le Roc-Saint-André is the municipal seat.

The municipality was established on 1 January 2016 and consists of the former communes of Le Roc-Saint-André, Quily and La Chapelle-Caro.

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