| Le Bellay-en-Vexin | |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason ville fr Le Bellay-en-Vexin (Val-d'Oise).svg |
| Coordinates: | 49.1519°N 1.8872°W |
| Arrondissement: | Pontoise |
| Canton: | Pontoise |
| Intercommunality: | Vexin Centre |
| Mayor: | Ludovic Bazot[1] |
| Term: | 2020 - 2026 |
| Elevation Min M: | 103 |
| Elevation Max M: | 130 |
| Area Km2: | 5.02 |
| Insee: | 95054 |
| Postal Code: | 95750 |
Le Bellay-en-Vexin (in French pronounced as /lə bɛlɛ ɑ̃ vɛksɛ̃/, literally Le Bellay in Vexin) is a commune in the Val-d'Oise department in Île-de-France in northern France.