| Montmachoux | |
| Commune Status: | Commune |
| Coordinates: | 48.3194°N 2.9939°W |
| Insee: | 77313 |
| Postal Code: | 77940 |
| Arrondissement: | Provins |
| Canton: | Nemours |
| Mayor: | Patrick Jacques[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | CC Pays de Montereau |
| Elevation Min M: | 96 |
| Elevation Max M: | 155 |
| Area Km2: | 4.43 |
Montmachoux (in French pronounced as /mɔ̃maʃu/) is a commune in the Seine-et-Marne department in the Île-de-France region in north-central France.