| Marcenais | |
| Commune Status: | Commune |
| Arrondissement: | Blaye |
| Canton: | Le Nord-Gironde |
| Insee: | 33266 |
| Postal Code: | 33620 |
| Mayor: | Patrick Pelleton[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | Latitude Nord Gironde |
| Coordinates: | 45.0589°N -0.3361°W |
| Elevation M: | 40 |
| Elevation Min M: | 16 |
| Elevation Max M: | 65 |
| Area Km2: | 9.04 |
Marcenais (in French pronounced as /maʁsənɛ/) is a commune in the Gironde department in Nouvelle-Aquitaine in southwestern France.