| Saint-Jean-sur-Vilaine | |
| Native Name: | (Gallo) |
| Commune Status: | Commune |
| Coordinates: | 48.1178°N -1.3597°W |
| Insee: | 35283 |
| Postal Code: | 35220 |
| Arrondissement: | Fougères-Vitré |
| Canton: | Châteaugiron |
| Mayor: | Marc Fauvel[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | CA Vitré Communauté |
| Elevation Min M: | 42 |
| Elevation Max M: | 112 |
| Area Km2: | 10.73 |
Saint-Jean-sur-Vilaine (in French pronounced as /sɛ̃ ʒɑ̃ syʁ vilɛn/; Gallo: Saent-Jan-sur-Vilaèyn, Breton: Sant-Yann-ar-Gwilen) is a commune in the Ille-et-Vilaine department in Brittany in northwestern France.
Inhabitants of Saint-Jean-sur-Vilaine are called saint-jeannais in French.