| Longchamps-sur-Aire | |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason ville fr Longchamps-sur-Aire 55.svg |
| Arrondissement: | Commercy |
| Canton: | Dieue-sur-Meuse |
| Insee: | 55301 |
| Postal Code: | 55260 |
| Mayor: | Séverine Macinot[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | CC de l'Aire à l'Argonne |
| Coordinates: | 48.9103°N 5.3072°W |
| Elevation M: | 247 |
| Elevation Min M: | 238 |
| Elevation Max M: | 346 |
| Area Km2: | 15.68 |
Longchamps-sur-Aire (in French pronounced as /lɔ̃ʃɑ̃ syʁ ɛːʁ/; literally "Longfields on Aire") is a commune in the Meuse department in Grand Est in north-eastern France.