| Marchainville | |
| Arrondissement: | Mortagne-au-Perche |
| Canton: | Tourouvre |
| Insee: | 61250 |
| Postal Code: | 61290 |
| Commune: | Longny les Villages |
| Coordinates: | 48.5853°N 0.8158°W |
| Elevation M: | 235 |
| Elevation Min M: | 212 |
| Elevation Max M: | 267 |
| Area Km2: | 21.61 |
| Population: | 250 |
| Population Date: | 2019 |
| Population Footnotes: | [1] |
Marchainville (in French pronounced as /maʁʃɛ̃vil/) is a former commune in the Orne department in north-western France. On 1 January 2016, it was merged into the new commune of Longny les Villages.[2]