| Mailly-sur-Seille | |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason Mailly-sur-Seille 54.svg |
| Arrondissement: | Nancy |
| Canton: | Entre Seille et Meurthe |
| Insee: | 54333 |
| Postal Code: | 54610 |
| Mayor: | Philippe Bernard[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | Seille et Grand Couronné |
| Coordinates: | 48.9114°N 6.2458°W |
| Elevation M: | 187 |
| Elevation Min M: | 184 |
| Elevation Max M: | 283 |
| Area Km2: | 6.4 |
Mailly-sur-Seille (pronounced as /fr/, literally Mailly on Seille) is a commune in the Meurthe-et-Moselle department in north-eastern France.