| Liny-devant-Dun | |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason ville fr Liny-devant-Dun (Meuse).svg |
| Arrondissement: | Verdun |
| Canton: | Stenay |
| Insee: | 55292 |
| Postal Code: | 55110 |
| Mayor: | Alain Reuter[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | CC du Pays de Stenay et du Val Dunois |
| Coordinates: | 49.3558°N 5.1986°W |
| Elevation M: | 280 |
| Elevation Min M: | 172 |
| Elevation Max M: | 282 |
| Area Km2: | 10.9 |
Liny-devant-Dun (in French pronounced as /lini dəvɑ̃ dœ̃/, literally Liny before Dun) is a commune in the Meuse department in Grand Est in north-eastern France.