| Nançois-sur-Ornain | |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason ville fr Nançois-sur-Ornain 55.svg |
| Arrondissement: | Bar-le-Duc |
| Canton: | Vaucouleurs |
| Insee: | 55372 |
| Postal Code: | 55500 |
| Mayor: | Sylvain Gillet[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | CA Bar-le-Duc - Sud Meuse |
| Coordinates: | 48.7131°N 5.3011°W |
| Elevation M: | 216 |
| Elevation Min M: | 212 |
| Elevation Max M: | 364 |
| Area Km2: | 7.98 |
Nançois-sur-Ornain (in French pronounced as /nɑ̃swa syʁ ɔʁnɛ̃/, literally Nançois on Ornain) is a commune in the Meuse department in Grand Est in north-eastern France.