| Saint-Cosme-en-Vairais | |
| Commune Status: | Commune |
| Arrondissement: | Mamers |
| Canton: | Mamers |
| Insee: | 72276 |
| Postal Code: | 72110 |
| Mayor: | Philippe Richard[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | Maine Saosnois |
| Coordinates: | 48.2739°N 0.46°W |
| Elevation Min M: | 67 |
| Elevation Max M: | 180 |
| Area Km2: | 32.63 |
Saint-Cosme-en-Vairais (in French pronounced as /sɛ̃ kom ɑ̃ vɛʁɛ/) is a commune in the Sarthe department in the region of Pays de la Loire in north-western France.