| Gressey | |
| Commune Status: | Commune |
| Arrondissement: | Mantes-la-Jolie |
| Canton: | Bonnières-sur-Seine |
| Insee: | 78285 |
| Postal Code: | 78550 |
| Mayor: | Valéry Bertrand[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | Pays houdanais |
| Coordinates: | 48.8347°N 1.6094°W |
| Elevation M: | 128 |
| Elevation Min M: | 106 |
| Elevation Max M: | 158 |
| Area Km2: | 7.11 |
Gressey is a commune in the Yvelines department in the Île-de-France region in north-central France.