| Filain | |
| Commune Status: | Commune |
| Coordinates: | 47.5197°N 6.1839°W |
| Insee: | 70234 |
| Postal Code: | 70230 |
| Arrondissement: | Vesoul |
| Canton: | Rioz |
| Mayor: | Matthieu Gannard[1] |
| Term: | 2020 - 2026 |
| Elevation Min M: | 257 |
| Elevation Max M: | 401 |
| Area Km2: | 15.79 |
Filain (in French pronounced as /filɛ̃/) is a commune in the Haute-Saône department in the region of Bourgogne-Franche-Comté in eastern France.