Schleizer Dreieck is a motorsports circuit located in Schleiz, Thuringia, Germany. It is the oldest racing track in Germany, and it was opened on 10 June 1923.
The circuit's original length was , it was firstly shortened to between May and August 1988, then to in July 2004. It has an average width of and elevation changes of .
The Schleizer Dreieck is mainly used for motorcycle racing events. It mainly hosts events for , but it also hosted international events, such as Sidecar World Championship and Cup of Peace and Friendship.
As of June 2025, the fastest official race lap records at the Schleizer Dreieck are listed as: