Trams in Vienna are a vital part of the public transport system in Vienna, capital city of Austria. In operation since 1865, with the completion of a 2 km (1.2 mi) route to industrial estates near Simmering, it reached its maximum extent of 292 km (181.4 mi) in 1942. In February 2015, it was the fifth largest tram network in the world, at about 176.9 kilometres (109.9 mi) in total length and 1,071 stations.

Wiener Linien is the company running most of the public transit network in the city of Vienna, Austria. It is part of the city corporation Wiener Stadtwerke.