| Mont-devant-Sassey | |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason ville fr Mont-Devant-Sassey (Meuse).svg |
| Arrondissement: | Verdun |
| Canton: | Stenay |
| Insee: | 55345 |
| Postal Code: | 55110 |
| Mayor: | Olivier Martinez[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | CC du Pays de Stenay et du Val Dunois |
| Coordinates: | 49.4114°N 5.1675°W |
| Elevation M: | 310 |
| Elevation Min M: | 170 |
| Elevation Max M: | 319 |
| Area Km2: | 8.22 |
Mont-devant-Sassey (in French pronounced as /mɔ̃ dəvɑ̃ sasɛ/, literally Mont before Sassey) is a commune in the Meuse department in Grand Est in north-eastern France.