| Saint-Martin-Lacaussade | |
| Commune Status: | Commune |
| Arrondissement: | Blaye |
| Canton: | L'Estuaire |
| Insee: | 33441 |
| Postal Code: | 33390 |
| Mayor: | Julien Bedis[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | Blaye |
| Coordinates: | 45.1478°N -0.6414°W |
| Elevation M: | 23 |
| Elevation Min M: | 2 |
| Elevation Max M: | 39 |
| Area Km2: | 3.94 |
Saint-Martin-Lacaussade (in French pronounced as /sɛ̃ maʁtɛ̃ lakosad/) is a commune in the Gironde department in Nouvelle-Aquitaine in southwestern France.