| Saint-Jean-de-Blaignac | |
| Commune Status: | Commune |
| Arrondissement: | Libourne |
| Canton: | Les Coteaux de Dordogne |
| Insee: | 33421 |
| Postal Code: | 33420 |
| Mayor: | Bernard Gauthier[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | Castillon Pujols |
| Coordinates: | 44.8139°N -0.1386°W |
| Elevation M: | 72 |
| Elevation Min M: | 3 |
| Elevation Max M: | 93 |
| Area Km2: | 5.58 |
Saint-Jean-de-Blaignac (pronounced as /fr/; Languedocien: Sent Joan de Blanhac) is a commune in the Gironde department in Nouvelle-Aquitaine in southwestern France.