| Comblessac | |
| Native Name: | (Gallo) |
| Commune Status: | Commune |
| Coordinates: | 47.8772°N -2.0828°W |
| Insee: | 35084 |
| Postal Code: | 35330 |
| Arrondissement: | Redon |
| Canton: | Guichen |
| Mayor: | Christophe Ricaud[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | Vallons de Haute-Bretagne |
| Elevation Min M: | 17 |
| Elevation Max M: | 96 |
| Area Km2: | 17.23 |
Comblessac (Gallo: Conbeczac,) is a commune in the Ille-et-Vilaine department of Brittany in northwestern France.
Inhabitants of Comblessac are called Comblessacois in French.