| Saint-Allouestre | |
| Native Name: | Sant-Aleustr |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason ville fr Saint-Allouestre (Morbihan).svg |
| Coordinates: | 47.9106°N -2.7219°W |
| Insee: | 56204 |
| Postal Code: | 56500 |
| Arrondissement: | Pontivy |
| Canton: | Moréac |
| Mayor: | Gérard Le Roy[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | Centre Morbihan Communauté |
| Elevation Min M: | 72 |
| Elevation Max M: | 162 |
| Area Km2: | 16.48 |
Saint-Allouestre (pronounced as /fr/; br|Sant-Aleustr) is a commune in the Morbihan department of Brittany in north-western France.[2] Inhabitants of Saint-Allouestre are called in French Allouestriens.