| Saint-Laurent-sur-Oust | |
| Native Name: | Sant-Laorañs-Graeneg |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason ville fr Saint-Laurent-sur-Oust 56.svg |
| Coordinates: | 47.795°N -2.3186°W |
| Insee: | 56224 |
| Postal Code: | 56140 |
| Arrondissement: | Vannes |
| Canton: | Moréac |
| Mayor: | Michel Berthet[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | CC de l'Oust à Brocéliande |
| Elevation Min M: | 7 |
| Elevation Max M: | 97 |
| Area Km2: | 3.88 |
Saint-Laurent-sur-Oust (pronounced as /fr/, literally Saint-Laurent on Oust;, before 1995: Saint-Laurent)[2] is a commune in the Morbihan department of Brittany in north-western France.[3] Inhabitants of Saint-Laurent-sur-Oust are called in French Laurentins.