| Saint-Trojan-les-Bains | |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason ville fr Saint-Trojan-les-Bains 17.svg |
| Arrondissement: | Rochefort |
| Canton: | Île d'Oléron |
| Insee: | 17411 |
| Postal Code: | 17370 |
| Mayor: | Marie-Josée Villautreix[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | Île-d'Oléron |
| Coordinates: | 45.8422°N -1.2069°W |
| Elevation M: | 8 |
| Elevation Min M: | 0 |
| Elevation Max M: | 35 |
| Area Km2: | 17.53 |
Saint-Trojan-les-Bains (in French pronounced as /sɛ̃ tʁɔʒɑ̃ le bɛ̃/) is a commune in the Charente-Maritime department in southwestern France. It is situated in the south of the island Oléron.