| Coin-sur-Seille | |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason ville fr Coin-sur-Seille (Moselle).svg |
| Arrondissement: | Metz |
| Canton: | Les Coteaux de Moselle |
| Insee: | 57147 |
| Postal Code: | 57420 |
| Mayor: | Lydia Andreucci[1] |
| Term: | 2023 - 2026 |
| Intercommunality: | Metz Métropole |
| Coordinates: | 49.0086°N 6.1603°W |
| Elevation M: | 191 |
| Elevation Min M: | 170 |
| Elevation Max M: | 232 |
| Area Km2: | 3.31 |
Coin-sur-Seille (in French pronounced as /kwɛ̃ syʁ sɛj/; German: Selzeck) is a commune in the Moselle department in Grand Est in north-eastern France.