| Aulnois-sur-Seille | |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason Aulnois-sur-Seille 57.svg |
| Arrondissement: | Sarrebourg-Château-Salins |
| Canton: | Le Saulnois |
| Insee: | 57040 |
| Postal Code: | 57590 |
| Mayor: | Jean-Luc Provost[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | CC Saulnois |
| Coordinates: | 48.8694°N 6.3158°W |
| Elevation M: | 180 |
| Elevation Min M: | 187 |
| Elevation Max M: | 272 |
| Area Km2: | 5.09 |
Aulnois-sur-Seille (in French pronounced as /o(l)nwa syʁ sɛj/, literally Aulnois on Seille; German: Erlen) is a commune in the Moselle department in Grand Est in northeastern France.