| Lachapelle-en-Blaisy | |
| Commune Status: | Commune |
| Arrondissement: | Chaumont |
| Canton: | Châteauvillain |
| Insee: | 52254 |
| Postal Code: | 52330 |
| Mayor: | Michel Menet[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | CA Chaumont |
| Coordinates: | 48.2017°N 4.9681°W |
| Elevation M: | 280 |
| Area Km2: | 16.53 |
Lachapelle-en-Blaisy (pronounced as /fr/) is a commune in the Haute-Marne department in north-eastern France.
The river Blaise flows through the commune.