| Marest-Dampcourt | |
| Commune Status: | Commune |
| Arrondissement: | Laon |
| Canton: | Chauny |
| Insee: | 02461 |
| Postal Code: | 02300 |
| Mayor: | Sabine Houzé[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | CA Chauny Tergnier La Fère |
| Coordinates: | 49.6008°N 3.1522°W |
| Elevation M: | 57 |
| Elevation Min M: | 38 |
| Elevation Max M: | 63 |
| Area Km2: | 8.35 |
Marest-Dampcourt is a commune in the Aisne department in Hauts-de-France in northern France.