| Ailleux | |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason ville fr Ailleux (Loire).svg |
| Arrondissement: | Montbrison |
| Canton: | Boën-sur-Lignon |
| Insee: | 42002 |
| Postal Code: | 42130 |
| Mayor: | Alban Fontenille[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | CA Loire Forez |
| Coordinates: | 45.8044°N 3.9433°W |
| Elevation M: | 700 |
| Elevation Min M: | 428 |
| Elevation Max M: | 722 |
| Area Km2: | 9.31 |
Ailleux (in French pronounced as /ajø/) is a commune in the Loire department in central France.