| Montmain | |
| Commune Status: | Commune |
| Arrondissement: | Rouen |
| Canton: | Le Mesnil-Esnard |
| Insee: | 76448 |
| Postal Code: | 76520 |
| Mayor: | Ludivine Haraux[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | Métropole Rouen Normandie |
| Coordinates: | 49.41°N 1.2389°W |
| Elevation M: | 150 |
| Elevation Min M: | 67 |
| Elevation Max M: | 159 |
| Area Km2: | 6.04 |
Montmain (pronounced as /fr/) is a commune in the Seine-Maritime department in the Normandy region in north-western France.
A village of forestry and farming, some 7miles southeast of Rouen at the junction of the D 42 and the D 491 roads.