| Saint-Marceau | |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason de la ville de Saint-Marceau (Ardennes).svg |
| Arrondissement: | Charleville-Mézières |
| Canton: | Nouvion-sur-Meuse |
| Insee: | 08388 |
| Postal Code: | 08160 |
| Mayor: | Teddy Etienne[1] |
| Term: | 2020 - 2026 |
| Coordinates: | 49.7°N 4.72°W |
| Elevation M: | 155 |
| Elevation Min M: | 153 |
| Elevation Max M: | 231 |
| Area Km2: | 4.80 |
Saint-Marceau (in French pronounced as /sɛ̃ maʁso/) is a commune in the Ardennes department in northern France.