| Dagny-Lambercy | |
| Commune Status: | Commune |
| Arrondissement: | Vervins |
| Canton: | Vervins |
| Insee: | 02256 |
| Postal Code: | 02140 |
| Mayor: | Pierre Didier[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | Portes de la Thiérache |
| Coordinates: | 49.7714°N 4.0444°W |
| Elevation M: | 223 |
| Elevation Min M: | 137 |
| Elevation Max M: | 211 |
| Area Km2: | 10.04 |
Dagny-Lambercy is a commune in the Aisne department in Hauts-de-France in northern France.