| Méry-sur-Oise | |
| Commune Status: | Commune |
| Coordinates: | 49.0644°N 2.1872°W |
| Arrondissement: | Pontoise |
| Canton: | Saint-Ouen-l'Aumône |
| Intercommunality: | Vallée de l'Oise et des Trois Forêts |
| Mayor: | Pierre-Édouard Eon[1] |
| Term: | 2020 - 2026 |
| Elevation Min M: | 22 |
| Elevation Max M: | 96 |
| Area Km2: | 11.17 |
| Insee: | 95394 |
| Postal Code: | 95540 |
Méry-sur-Oise (pronounced as /fr/, literally Méry on Oise) is a commune in the Val-d'Oise department in Île-de-France in northern France. Méry-sur-Oise station has rail connections to Persan, Saint-Leu-la-Forêt and Paris.