| Billy-sous-Mangiennes | |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason de la ville de Billy-sous-Mangiennes (55).svg |
| Arrondissement: | Verdun |
| Canton: | Bouligny |
| Insee: | 55053 |
| Postal Code: | 55230 |
| Mayor: | Bénédicte Gonzalez[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | Damvillers Spincourt |
| Coordinates: | 49.3333°N 5.5761°W |
| Elevation M: | 209 |
| Elevation Min M: | 202 |
| Elevation Max M: | 250 |
| Area Km2: | 24.66 |
Billy-sous-Mangiennes (in French pronounced as /biji su mɑ̃ʒjɛn/, literally Billy under Mangiennes) is a commune in the Meuse department in Grand Est in northeastern France.