| Val d'Oust | |
| Commune Status: | Commune |
| Arrondissement: | Pontivy |
| Canton: | Moréac |
| Insee: | 56197 |
| Postal Code: | 56460 |
| Mayor: | Florence Prunet[1] |
| Term: | 2020 - 2026 |
| Coordinates: | 47.865°N -2.449°W |
| Area Km2: | 31.81 |
Val d'Oust (in French pronounced as /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.[2]