| Longvilliers | |
| Commune Status: | Commune |
| Arrondissement: | Rambouillet |
| Canton: | Rambouillet |
| Insee: | 78349 |
| Postal Code: | 78730 |
| Mayor: | Maurice Chanclud[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | CA Rambouillet Territoires |
| Coordinates: | 48.5797°N 1.9928°W |
| Elevation M: | 91 |
| Elevation Min M: | 79 |
| Elevation Max M: | 160 |
| Area Km2: | 13.91 |
Longvilliers (in French pronounced as /lɔ̃vilje/) is a commune in the Yvelines department in the Île-de-France region in north-central France. With a population of 501 in 2021,[2] the median age was 43 years. [3] The average income per capita was €34,010, which was above the national average (€20,590).[4]