| Montreuil-sur-Blaise | |
| Commune Status: | Commune |
| Arrondissement: | Saint-Dizier |
| Canton: | Wassy |
| Insee: | 52336 |
| Postal Code: | 52130 |
| Mayor: | Laurent Gouverneur[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | CA Grand Saint-Dizier, Der et Vallées |
| Coordinates: | 48.4775°N 4.965°W |
| Elevation M: | 175 |
| Elevation Min M: | 168 |
| Elevation Max M: | 216 |
| Area Km2: | 1.36 |
Montreuil-sur-Blaise (pronounced as /fr/, literally Montreuil on Blaise) is a commune in the Haute-Marne department in north-eastern France.
The river Blaise flows through the commune.