| Longchamp-sous-Châtenois | |
| Commune Status: | Commune |
| Arrondissement: | Neufchâteau |
| Canton: | Mirecourt |
| Insee: | 88274 |
| Postal Code: | 88170 |
| Mayor: | Noël Savarit[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | CC l'Ouest Vosgien |
| Coordinates: | 48.2903°N 5.8292°W |
| Elevation M: | 321 |
| Elevation Min M: | 309 |
| Elevation Max M: | 405 |
| Area Km2: | 4.85 |
Longchamp-sous-Châtenois (in French pronounced as /lɔ̃ʃɑ̃ su ʃatnwa/, literally Longchamp under Châtenois) is a commune in the Vosges department in Grand Est in northeastern France.