| Chaumont-en-Vexin | |
| Commune Status: | Commune |
| Arrondissement: | Beauvais |
| Canton: | Chaumont-en-Vexin |
| Insee: | 60143 |
| Postal Code: | 60240 |
| Mayor: | Emmanuelle Lamarque[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | Vexin Thelle |
| Coordinates: | 49.2683°N 1.8897°W |
| Elevation M: | 69 |
| Elevation Min M: | 57 |
| Elevation Max M: | 144 |
| Area Km2: | 18.54 |
Chaumont-en-Vexin (in French pronounced as /ʃomɔ̃ ɑ̃ vɛksɛ̃/, literally Chaumont in Vexin) is a commune in the Oise department in northern France.