| Monterfil | |
| Native Name: | (Gallo) |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason ville fr Monterfil 35.svg |
| Coordinates: | 48.0667°N -1.9775°W |
| Insee: | 35187 |
| Postal Code: | 35160 |
| Arrondissement: | Rennes |
| Canton: | Montfort-sur-Meu |
| Mayor: | Michel Duault[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | Brocéliande |
| Elevation Min M: | 32 |
| Elevation Max M: | 132 |
| Area Km2: | 16.94 |
Monterfil (in French pronounced as /mɔ̃tɛʁfil/; Breton: Mousterfil; Gallo: Mósterfiu) is a commune in the Ille-et-Vilaine department of Brittany in northwestern France.