| Mézières-sur-Seine | |
| Commune Status: | Commune |
| Arrondissement: | Mantes-la-Jolie |
| Canton: | Limay |
| Insee: | 78402 |
| Postal Code: | 78970 |
| Mayor: | Franck Fontaine[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | CU Grand Paris Seine et Oise |
| Coordinates: | 48.9589°N 1.8047°W |
| Elevation M: | 22 |
| Elevation Min M: | 17 |
| Elevation Max M: | 156 |
| Area Km2: | 10.42 |
Mézières-sur-Seine (in French pronounced as /mezjɛʁ syʁ sɛn/, literally Mézières on Seine) is a commune in the Yvelines department in the Île-de-France region in north-central France. It is located in the western suburbs of Paris, near the bank of the Seine 47km (29miles) west of Paris.
The name of the commune comes from the Latin word: maceria, meaning walls.
Saint-Nicolas church, built in the 13th century in Gothic style. A choir was added since the 17th century. It is a listed monument since 1931.