| Montagny-en-Vexin | |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason ville fr oise montagny en vexin.svg |
| Arrondissement: | Beauvais |
| Canton: | Chaumont-en-Vexin |
| Insee: | 60412 |
| Postal Code: | 60240 |
| Mayor: | Loïc Taillebrest[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | Vexin Thelle |
| Coordinates: | 49.1961°N 1.8011°W |
| Elevation Min M: | 87 |
| Elevation Max M: | 203 |
| Area Km2: | 4.18 |
Montagny-en-Vexin (pronounced as /fr/, literally Montagny in Vexin) is a commune in the Oise department in northern France.
It takes its name from Vexin, a former province between Île-de-France and Normandy.