| Fay-sur-Lignon | |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason ville fr Fay sur Lignon 43.svg |
| Arrondissement: | Le Puy-en-Velay |
| Canton: | Mézenc |
| Mayor: | Christian Chorliet[1] |
| Term: | 2020 - 2026 |
| Coordinates: | 44.9872°N 4.2272°W |
| Elevation Min M: | 1079 |
| Elevation Max M: | 1380 |
| Area Km2: | 13.24 |
| Insee: | 43092 |
| Postal Code: | 43430 |
Fay-sur-Lignon (in French pronounced as /faj syʁ liɲɔ̃/, literally Fay on Lignon; Occitan (post 1500);: Fai) is a commune in the Haute-Loire department in south-central France.
The river Lignon du Velay flows through the commune.