| Blain | |
| Native Name: | (Gallo & Breton) (Gallo) |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason ville fr Blain (Loire-Atlantique).svg |
| Arrondissement: | Châteaubriant-Ancenis |
| Canton: | Blain |
| Insee: | 44015 |
| Postal Code: | 44130 |
| Mayor: | Jean-Michel Buf[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | Région de Blain |
| Coordinates: | 47.4769°N -1.7622°W |
| Elevation Min M: | 7 |
| Elevation Max M: | 44 |
| Area Km2: | 101.72 |
Blain (in French pronounced as /blɛ̃/; Gallo: Blaen, Blin or Byein, Breton: Blaen) is a commune in the Loire-Atlantique department in western France. The commune includes the small town of Blain and the villages of Saint-Émilien-de-Blain and La Chaussée.
Blain is twinned with the market town of Royal Wootton Bassett, England.