| Fagnon | |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason ville fr Fagnon (Ardennes).svg |
| Arrondissement: | Charleville-Mézières |
| Canton: | Charleville-Mézières-1 |
| Insee: | 08162 |
| Postal Code: | 08090 |
| Mayor: | Coralie Durand[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | Ardenne Métropole |
| Coordinates: | 49.7372°N 4.6364°W |
| Elevation M: | 173 |
| Area Km2: | 9.98 |
Fagnon (in French pronounced as /faɲɔ̃/) is a commune in the Ardennes department in the Grand Est region, northern France.