The Solitude racetrack is an 11.4086 km (7.0890 mi) race circuit on public roads used for motorsport in the Leonberg area, west of Stuttgart, Germany. It is named after Castle Solitude and until 1965 has hosted various motorcycle and automobile races.
- From 1935: Final circuit layout: The route introduced 1931 through Mahdental plus the part excluded in 1931 form the 11.4086 km (7.0890 mi) course used until 1965. Direction: counterclockwise.
- 1965: Races of motocycles, sports cars and Formula 2 cars mark the final time that international motor sports events were held on the "Solitude".