| Grandchamp | |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason ville fr Grandchamp 78.svg |
| Arrondissement: | Mantes-la-Jolie |
| Canton: | Bonnières-sur-Seine |
| Insee: | 78283 |
| Postal Code: | 78113 |
| Mayor: | Hervé Renauld[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | Pays Houdanais |
| Coordinates: | 48.7083°N 1.6019°W |
| Elevation M: | 107 |
| Elevation Min M: | 123 |
| Elevation Max M: | 183 |
| Area Km2: | 6.05 |
Grandchamp (in French pronounced as /ɡʁɑ̃ʃɑ̃/) is a commune in the Yvelines department in the Île-de-France region in north-central France.