The Stadtbahnwagen Typ B (translation Type "B" Light Rail Vehicle, short form B-Wagen) is a light rail vehicle used by several Stadtbahn networks in the German state of North Rhine-Westphalia as well as by the Bursaray network in Bursa, Turkey.

Because the future Cologne Stadtbahn already had one finished tunnel, that was built with the city's own money with streetcars in mind, the Stadtbahnwagen designed for the Rhine-Ruhr network was not suitable.

The type "A" concept, which consists of close coupled two-car sets, was shelved and later revived for the Stuttgart Stadtbahn.

The Typ B formed the basis for the British-built Metrocars on the Tyne and Wear Metro, which opened in 1980.

The Typ B also formed the basis for the vehicles used on the Docklands Light Railway (DLR), which opened in 1987.