Mios is a commune in the Gironde department in Nouvelle-Aquitaine in southwestern France. Its inhabitants are called Miossais. The Saint B…Mios is a commune in the Gironde department in Nouvelle-Aquitaine in southwestern France. Its inhabitants are called Miossais. The Saint Brice chapel has a bell dating from 1700 classed as a monument historique by the French Ministry of Culture in 1942.