| Dagny | |
| Commune Status: | Commune |
| Coordinates: | 48.7167°N 3.1667°W |
| Insee: | 77151 |
| Postal Code: | 77320 |
| Arrondissement: | Meaux |
| Canton: | Coulommiers |
| Mayor: | Jean-Raymond Patin[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | Coulommiers Pays de Brie |
| Elevation Min M: | 112 |
| Elevation Max M: | 159 |
| Area Km2: | 7.89 |
Dagny (in French pronounced as /daɲi/) is a commune in the Seine-et-Marne department in the Île-de-France region in north-central France.
The river Aubetin flows northwestward through the commune.