| Achain | |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason ville fr Achain (Moselle).svg |
| Arrondissement: | Sarrebourg-Château-Salins |
| Canton: | Le Saulnois |
| Insee: | 57004 |
| Postal Code: | 57340 |
| Mayor: | Louis Renard[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | Saulnois |
| Coordinates: | 48.9144°N 6.5928°W |
| Elevation Min M: | 227 |
| Elevation Max M: | 330 |
| Area Km2: | 4.79 |
Achain (in French pronounced as /aʃɛ̃/; German: Eschen) is a commune in the Moselle department in Grand Est in northeastern France.