| Montier-en-Der | |
| Arrondissement: | Saint-Dizier |
| Canton: | Wassy |
| Insee: | 52331 |
| Postal Code: | 52220 |
| Commune: | La Porte du Der |
| Coordinates: | 48.4786°N 4.7708°W |
| Elevation M: | 130 |
| Elevation Min M: | 120 |
| Elevation Max M: | 160 |
| Area Km2: | 27.79 |
| Population: | 1953 |
| Population Date: | 2019 |
| Population Footnotes: | [1] |
Montier-en-Der (pronounced as /fr/) is a former commune in the Haute-Marne department in north-eastern France. On 1 January 2016, it was merged into the new commune La Porte du Der.[2] The 10th century church of the former Montier-en-Der Abbey has been preserved.