| Saint-Mariens | |
| Commune Status: | Commune |
| Arrondissement: | Blaye |
| Canton: | Le Nord-Gironde |
| Insee: | 33439 |
| Postal Code: | 33620 |
| Mayor: | Marcel Bourreau[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | Latitude Nord Gironde |
| Coordinates: | 45.1175°N -0.4017°W |
| Elevation M: | 45 |
| Elevation Min M: | 29 |
| Elevation Max M: | 98 |
| Area Km2: | 12 |
Saint-Mariens (in French pronounced as /sɛ̃ maʁjɛ̃/) is a commune in the Gironde department in Nouvelle-Aquitaine in southwestern France.