| Saint-Magne-de-Castillon | |
| Commune Status: | Commune |
| Arrondissement: | Libourne |
| Canton: | Les Coteaux de Dordogne |
| Insee: | 33437 |
| Postal Code: | 33350 |
| Mayor: | Jean-Claude Delongeas[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | Castillon-Pujols |
| Coordinates: | 44.865°N -0.064°W |
| Elevation M: | 21 |
| Elevation Min M: | 1 |
| Elevation Max M: | 96 |
| Area Km2: | 13.87 |
Saint-Magne-de-Castillon (in French pronounced as /sɛ̃ maɲ də kastijɔ̃/, literally Saint-Magne of Castillon; Occitan (post 1500);: Sent Manhe de Castilhon) is a commune in the Gironde department in Nouvelle-Aquitaine in southwestern France.