| La Porte du Der | |
| Commune Status: | Commune |
| Arrondissement: | Saint-Dizier |
| Canton: | Wassy |
| Insee: | 52331 |
| Postal Code: | 52220 |
| Mayor: | Jean-Jacques Bayer[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | CA Saint-Dizier Der et Blaise |
| Coordinates: | 48.478°N 4.771°W |
| Area Km2: | 47.23 |
La Porte du Der (in French pronounced as /la pɔʁt dy dɛʁ/) is a commune in the Haute-Marne department of northeastern France. The commune was established on 1 January 2016 and consists of the former communes of Montier-en-Der and Robert-Magny.[2]