The Brigach is the shorter of two streams that jointly form the river Danube in Baden-Württemberg, Germany. The Brigach has its source at 925 m (3,035 ft) above sea level within St. Georgen in the Black Forest. The Brigach crosses the city Villingen-Schwenningen. 40.4 km (25.1 mi) from the source, the Brigach joins the Breg in Donaueschingen to form the Danube River.

The name Brigach is of Celtic origin and means "light coloured, pure water".