| Chazelles-sur-Lyon | |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason ville fr Chazelles-sur-Lyon (Loire).svg |
| Arrondissement: | Montbrison |
| Canton: | Feurs |
| Insee: | 42059 |
| Postal Code: | 42140 |
| Mayor: | Pierre Véricel[1] |
| Term: | 2020 - 2026 |
| Coordinates: | 45.6394°N 4.3925°W |
| Elevation M: | 630 |
| Elevation Min M: | 414 |
| Elevation Max M: | 631 |
| Area Km2: | 20.91 |
Chazelles-sur-Lyon (pronounced as /fr/, literally Chazelles on Lyon) is a commune in the Loire department in central France.