Line U3 is a line on the Vienna U-Bahn metro system.

[1] Opened in 1991, it currently has 21 stations and a total length of 13.4 km (8.3 mi), from Ottakring to Simmering, making it the shortest line on the network.

[2] It is connected to U1 at Stephansplatz, U2 at Volkstheater, U4 at Landstraße and U6 at Westbahnhof.

Line U3 currently serves the following stations:[3]