| Brie-sous-Mortagne | |
| Commune Status: | Commune |
| Arrondissement: | Saintes |
| Canton: | Saintonge Estuaire |
| Insee: | 17068 |
| Postal Code: | 17120 |
| Mayor: | Maurice Girerd[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | CA Royan Atlantique |
| Coordinates: | 45.4956°N -0.7419°W |
| Elevation Min M: | 5 |
| Elevation Max M: | 61 |
| Area Km2: | 7.22 |
Brie-sous-Mortagne (in French pronounced as /bʁi su mɔʁtaɲ/, literally Brie under Mortagne) is a commune in the Charente-Maritime department in the Nouvelle-Aquitaine region in southwestern France.