| Saint-Mars-la-Réorthe | |
| Commune Status: | Commune |
| Arrondissement: | La Roche-sur-Yon |
| Canton: | Les Herbiers |
| Insee: | 85242 |
| Postal Code: | 85590 |
| Mayor: | Patrice Bertrand[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | Pays des Herbiers |
| Coordinates: | 46.8625°N -0.9244°W |
| Elevation Min M: | 101 |
| Elevation Max M: | 262 |
| Area Km2: | 9.28 |
Saint-Mars-la-Réorthe (pronounced as /fr/) is a commune in the Vendée department in the Pays de la Loire region in western France.