| Saint-Mars-d'Outillé | |
| Commune Status: | Commune |
| Arrondissement: | Le Mans |
| Canton: | Changé |
| Insee: | 72299 |
| Postal Code: | 72220 |
| Mayor: | Laurent Taupin[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | Sud-Est du Pays Manceau |
| Coordinates: | 47.8889°N 0.3336°W |
| Elevation Min M: | 74 |
| Elevation Max M: | 168 |
| Area Km2: | 38.04 |
| Demonym: | Saint-Martien, Saint-Martienne |
Saint-Mars-d'Outillé (pronounced as /fr/) is a commune in the Sarthe department in the region of Pays de la Loire in north-western France.