| Saint-Georges-de-Gréhaigne | |
| Native Name: | (Gallo) |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason ville fr Saint-Georges-de-Gréhaigne (Ille-et-Vilaine).svg |
| Coordinates: | 48.5689°N -1.5478°W |
| Insee: | 35270 |
| Postal Code: | 35610 |
| Arrondissement: | Saint-Malo |
| Canton: | Dol-de-Bretagne |
| Mayor: | Jean-Pierre Héry[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | Pays de Dol et Baie du Mont Saint-Michel |
| Elevation Min M: | 5 |
| Elevation Max M: | 81 |
| Area Km2: | 12.15 |
Saint-Georges-de-Gréhaigne (in French pronounced as /sɛ̃ ʒɔʁʒ də ɡʁe.ɛɲ/; Gallo: Saent-Jord-de-Gerhaènn, Breton: Sant-Jord-Grehan) is a commune in the Ille-et-Vilaine department of Brittany in north-western France.
Inhabitants of Saint-Georges-de-Gréhaigne are called grehaignois in French.