| Bullion | |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason ville fr Bullion (Yvelines).svg |
| Arrondissement: | Rambouillet |
| Canton: | Rambouillet |
| Insee: | 78120 |
| Postal Code: | 78830 |
| Mayor: | Xavier Caris[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | CA Rambouillet Territoires |
| Coordinates: | 48.6228°N 1.9967°W |
| Elevation M: | 104 |
| Elevation Min M: | 93 |
| Elevation Max M: | 178 |
| Area Km2: | 20.9 |
Bullion (pronounced as /fr/) is a commune in the Yvelines department in the Île-de-France region in north-central France.