| Mars-sous-Bourcq | |
| Commune Status: | Commune |
| Arrondissement: | Vouziers |
| Canton: | Attigny |
| Insee: | 08279 |
| Postal Code: | 08400 |
| Mayor: | Michaël Audegond[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | Argonne Ardennaise |
| Coordinates: | 49.3975°N 4.6419°W |
| Elevation M: | 102 |
| Area Km2: | 4.73 |
Mars-sous-Bourcq (in French pronounced as /maʁs su buʁk/) is a commune in the Ardennes department and Grand Est region of north-eastern France.