| Leigneux | |
| Commune Status: | Commune |
| Arrondissement: | Montbrison |
| Canton: | Boën-sur-Lignon |
| Insee: | 42119 |
| Postal Code: | 42130 |
| Mayor: | Marie-Gabrielle Pfister[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | CA Loire Forez |
| Coordinates: | 45.7522°N 3.9769°W |
| Elevation M: | 438 |
| Elevation Min M: | 389 |
| Elevation Max M: | 581 |
| Area Km2: | 4.53 |
Leigneux (in French pronounced as /lɛɲø/) is a commune in the Loire department in central France.
The river Lignon du Forez flows through the commune.