| Marsas | |
| Commune Status: | Commune |
| Arrondissement: | Blaye |
| Canton: | Le Nord-Gironde |
| Insee: | 33272 |
| Postal Code: | 33620 |
| Mayor: | Brigitte Misiak[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | Latitude Nord Gironde |
| Coordinates: | 45.0683°N -0.3814°W |
| Elevation M: | 65 |
| Elevation Min M: | 27 |
| Elevation Max M: | 71 |
| Area Km2: | 8.13 |
Marsas (in French pronounced as /maʁsas/) is a commune in the Gironde department in Nouvelle-Aquitaine in southwestern France.