| Mont-Saint-Jean | |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason ville fr Mont-Saint-Jean (Sarthe).svg |
| Arrondissement: | Mamers |
| Canton: | Sillé-le-Guillaume |
| Insee: | 72211 |
| Postal Code: | 72140 |
| Mayor: | Daniel Lefevre[1] |
| Term: | 2020 - 2026 |
| Coordinates: | 48.2464°N 0.1075°W |
| Elevation Min M: | 95 |
| Elevation Max M: | 271 |
| Area Km2: | 42.31 |
Mont-Saint-Jean (in French pronounced as /mɔ̃ sɛ̃ ʒɑ̃/) is a commune in the Sarthe department in the region of Pays de la Loire in north-western France.