| Chagnon | |
| Commune Status: | Commune |
| Arrondissement: | Saint-Étienne |
| Canton: | Sorbiers |
| Insee: | 42036 |
| Postal Code: | 42800 |
| Mayor: | Frédérique Chave[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | Saint-Étienne Métropole |
| Coordinates: | 45.5356°N 4.5539°W |
| Elevation M: | 310 |
| Elevation Min M: | 300 |
| Elevation Max M: | 518 |
| Area Km2: | 2.48 |
Chagnon (in French pronounced as /ʃaɲɔ̃/) is a commune in the Loire department in central France.