| Blaisy | |
| Commune Status: | Commune |
| Arrondissement: | Chaumont |
| Canton: | Châteauvillain |
| Insee: | 52053 |
| Postal Code: | 52330 |
| Mayor: | Pierre Delaître[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | CA Chaumont |
| Coordinates: | 48.1742°N 4.9972°W |
| Elevation M: | 290 |
| Area Km2: | 5.62 |
Blaisy (in French pronounced as /blɛzi/) is a commune in the Haute-Marne department in northeastern France.
The river Blaise flows through the commune.