| Coësmes | |
| Native Name: | (Gallo) |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason ville fr Coësmes (Ille-et-Vilaine).svg |
| Coordinates: | 47.8839°N -1.4394°W |
| Insee: | 35082 |
| Postal Code: | 35134 |
| Arrondissement: | Fougères-Vitré |
| Canton: | La Guerche-de-Bretagne |
| Mayor: | Luc Gallard[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | Roche-aux-Fées |
| Elevation Min M: | 47 |
| Elevation Max M: | 107 |
| Area Km2: | 23.24 |
Coësmes (in French pronounced as /kɔɛm/; Gallo: Coèsm, Breton: Koem) is a commune in the Ille-et-Vilaine department in Brittany in northwestern France.
Inhabitants of Coësmes are called Coësmois in French.