| Farnay | |
| Commune Status: | Commune |
| Arrondissement: | Saint-Étienne |
| Canton: | Rive-de-Gier |
| Insee: | 42093 |
| Postal Code: | 42320 |
| Mayor: | Jean-Alain Barrier[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | Saint-Étienne Métropole |
| Coordinates: | 45.4942°N 4.5986°W |
| Elevation M: | 445 |
| Elevation Min M: | 315 |
| Elevation Max M: | 792 |
| Area Km2: | 7.93 |
Farnay (in French pronounced as /faʁnɛ/) is a commune in the Loire department in central France.