| Guernes | |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason ville fr Guernes (Yvelines).svg |
| Arrondissement: | Mantes-la-Jolie |
| Canton: | Limay |
| Insee: | 78290 |
| Postal Code: | 78520 |
| Mayor: | Pascal Brusseaux[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | CU Grand Paris Seine et Oise |
| Coordinates: | 49.0117°N 1.6367°W |
| Elevation M: | 50 |
| Elevation Min M: | 15 |
| Elevation Max M: | 71 |
| Area Km2: | 8.54 |
Guernes (in French pronounced as /ɡɛʁn/) is a commune in the Yvelines department in the Île-de-France region in north-central France.