| Saint-Perreux | |
| Native Name: | Sant-Pereg |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason ville fr Saint-Perreux (Morbihan).svg |
| Coordinates: | 47.67°N -2.1064°W |
| Insee: | 56232 |
| Postal Code: | 56350 |
| Arrondissement: | Vannes |
| Canton: | Guer |
| Mayor: | Lionel Jouneau[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | Redon Agglomération |
| Elevation Min M: | 1 |
| Elevation Max M: | 49 |
| Area Km2: | 6.23 |
Saint-Perreux (pronounced as /fr/;) is a commune in the Morbihan department of Brittany in north-western France.[2] It was named after the Welsh monk, Saint Petroc.
The river Arz forms most of the commune's western and south-western borders, then flows (at Saint-Jean-la-Poterie) into the Oust, which forms the commune's eastern border.
Inhabitants of Saint-Perreux are called in French Perrusiens or Perreusiens.