| Sonchamp | |
| Commune Status: | Commune |
| Arrondissement: | Rambouillet |
| Canton: | Rambouillet |
| Insee: | 78601 |
| Postal Code: | 78120 |
| Mayor: | Ysabelle May-Ott[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | CA Rambouillet Territoires |
| Coordinates: | 48.5767°N 1.8786°W |
| Elevation M: | 151 |
| Elevation Min M: | 121 |
| Elevation Max M: | 172 |
| Area Km2: | 46.49 |
Sonchamp (in French pronounced as /sɔ̃ʃɑ̃/) is a commune in the Yvelines department in the Île-de-France in north-central France.