| Blagny | |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason ville fr Blagny 08.svg |
| Arrondissement: | Sedan |
| Canton: | Carignan |
| Insee: | 08067 |
| Postal Code: | 08110 |
| Mayor: | Théodor Lukowski[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | Portes du Luxembourg |
| Coordinates: | 49.6217°N 5.1919°W |
| Elevation M: | 165 |
| Elevation Min M: | 162 |
| Elevation Max M: | 280 |
| Area Km2: | 7.42 |
Blagny (in French pronounced as /blaɲi/) is a commune in the Ardennes department in northern France. It is around 7 km from the Belgian border, and around 20 km south-east of Sedan.