Brie-sous-Mortagne

{{Use dmy dates|date=August 2023}}

{{Infobox French commune

|name = Brie-sous-Mortagne

|commune status = Commune

|image = Brie-sous-Mortagne mairie.jpg

|caption = The town hall in Brie-sous-Mortagne

|arrondissement = Saintes

|canton = Saintonge Estuaire

|INSEE = 17068

|postal code = 17120

|mayor = Maurice Girerd{{cite web|title=Répertoire national des élus: les maires|url=https://www.data.gouv.fr/fr/datasets/r/2876a346-d50c-4911-934e-19ee07b0e503|website=data.gouv.fr, Plateforme ouverte des données publiques françaises|date=2 December 2020|language=fr}}

|term = 2020–2026

|intercommunality = CA Royan Atlantique

|coordinates = {{coord|45.4956|-0.7419|format=dms|display=inline,title}}

|elevation min m = 5

|elevation max m = 61

|area km2 = 7.22

|population = {{France metadata Wikidata|population_total}}

|population date = {{France metadata Wikidata|population_as_of}}

|population footnotes = {{France metadata Wikidata|population_footnotes}}

}}

Brie-sous-Mortagne ({{IPA|fr|bʁi su mɔʁtaɲ}}, literally Brie under Mortagne) is a commune in the Charente-Maritime department in the Nouvelle-Aquitaine region in southwestern France.