| Tagnon | |
| Commune Status: | Commune |
| Arrondissement: | Rethel |
| Canton: | Château-Porcien |
| Insee: | 08435 |
| Postal Code: | 08300 |
| Mayor: | Monique Misset[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | Pays Rethélois |
| Coordinates: | 49.4403°N 4.2908°W |
| Elevation M: | 105 |
| Elevation Min M: | 83 |
| Elevation Max M: | 148 |
| Area Km2: | 23.97 |
Tagnon (in French pronounced as /taɲɔ̃/) is a commune in the Ardennes department in northern France.