| La Chapelle-en-Vexin | |
| Commune Status: | Commune |
| Coordinates: | 49.1847°N 1.7328°W |
| Arrondissement: | Pontoise |
| Canton: | Vauréal |
| Mayor: | Joëlle Valenchon[1] |
| Term: | 2020 - 2026 |
| Elevation Min M: | 85 |
| Elevation Max M: | 158 |
| Area Km2: | 3.61 |
| Insee: | 95139 |
| Postal Code: | 95420 |
La Chapelle-en-Vexin is a commune in the Val-d'Oise department in Île-de-France in northern France.