| Saint-Mars-du-Désert | |
| Commune Status: | Commune |
| Arrondissement: | Mayenne |
| Canton: | Villaines-la-Juhel |
| Insee: | 53236 |
| Postal Code: | 53700 |
| Mayor: | Gaspard Saver[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | CC du Mont des Avaloirs |
| Coordinates: | 48.2947°N -0.1575°W |
| Elevation M: | 271 |
| Elevation Min M: | 107 |
| Elevation Max M: | 219 |
| Area Km2: | 11.87 |
Saint-Mars-du-Désert (in French pronounced as /sɛ̃ maʁ dy dezɛʁ/) is a commune in the Mayenne department in north-western France.[2]