| Montchaton | |
| Arrondissement: | Coutances |
| Canton: | Coutances |
| Insee: | 50339 |
| Postal Code: | 50660 |
| Commune: | Orval-sur-Sienne |
| Coordinates: | 49.0094°N -1.4972°W |
| Elevation M: | 51 |
| Elevation Min M: | 5 |
| Elevation Max M: | 61 |
| Area Km2: | 6.50 |
| Population: | 294 |
| Population Date: | 2019 |
| Population Footnotes: | [1] |
Montchaton (in French pronounced as /mɔ̃ʃatɔ̃/) is a former commune in the Manche department in Normandy in north-western France. On 1 January 2016, it was merged, together with the commune of Orval, into the new commune of Orval-sur-Sienne.[2]