Wiener Platz is an interchange station and hub on the Cologne Stadtbahn lines 4, 13 and 18 in the Cologne district of Mülheim. The station is located at Wiener Platz, the center of Mülheim. The station consists of an at-grade station for line 4 and an underground station for line 13 and 18. The underground station was opened in 1997.