| Saint-Martin-de-Coux | |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason ville fr Saint-Martin-de-Coux (Charente-Maritime).svg |
| Arrondissement: | Jonzac |
| Canton: | Les Trois Monts |
| Insee: | 17366 |
| Postal Code: | 17360 |
| Mayor: | Alain Feuillet[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | Haute-Saintonge |
| Coordinates: | 45.1461°N -0.1081°W |
| Elevation M: | 80 |
| Elevation Min M: | 30 |
| Elevation Max M: | 111 |
| Area Km2: | 15.71 |
Saint-Martin-de-Coux (in French pronounced as /sɛ̃ maʁtɛ̃ də ku/) is a commune in the Charente-Maritime department in southwestern France.