| Saint-Arnoult-en-Yvelines | |
| Commune Status: | Commune |
| Arrondissement: | Rambouillet |
| Canton: | Rambouillet |
| Insee: | 78537 |
| Postal Code: | 78730 |
| Mayor: | Joëlle Jegat[1] |
| Term: | 2021 - 2026 |
| Intercommunality: | CA Rambouillet Territoires |
| Coordinates: | 48.5722°N 1.9414°W |
| Elevation M: | 104 |
| Elevation Min M: | 103 |
| Elevation Max M: | 164 |
| Area Km2: | 12.55 |
Saint-Arnoult-en-Yvelines is a commune in the Yvelines department in the Île-de-France in north-central France.