| Montigny-devant-Sassey | |
| Commune Status: | Commune |
| Arrondissement: | Verdun |
| Canton: | Stenay |
| Insee: | 55349 |
| Postal Code: | 55110 |
| Mayor: | Michel Lefort[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | CC du Pays de Stenay et du Val Dunois |
| Coordinates: | 49.4333°N 5.1528°W |
| Elevation Min M: | 178 |
| Elevation Max M: | 322 |
| Area Km2: | 9.72 |
Montigny-devant-Sassey (in French pronounced as /mɔ̃tiɲi dəvɑ̃ sasɛ/, literally Montigny before Sassey) is a commune in the Meuse department in Grand Est in north-eastern France.