| Saint-Hilarion | |
| Commune Status: | Commune |
| Arrondissement: | Rambouillet |
| Canton: | Rambouillet |
| Insee: | 78557 |
| Postal Code: | 78120 |
| Mayor: | Jean-Claude Batteux[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | CA Rambouillet Territoires |
| Coordinates: | 48.6211°N 1.7342°W |
| Elevation M: | 150 |
| Elevation Min M: | 114 |
| Elevation Max M: | 169 |
| Area Km2: | 14.00 |
Saint-Hilarion is a commune in the Yvelines department in the Île-de-France region in north-central France.