Schloss Tiengen, Château in Waldshut-Tiengen, Germany

Schloss Tiengen is a castle complex in Waldshut-Tiengen, Germany, composed of the Old Castle featuring a defensive tower and the New Castle positioned above the historic town center. The two structures together create a varied architectural ensemble that rises from the hillside overlooking the streets below.

The Old Castle is an 11th-century defensive and residential tower built by the Barons of Krenkingen. In the Swabian War of 1499, 5,000 Confederates besieged Tiengen, which surrendered on 21 April; the town was plundered and burned. Johann Ludwig I of Sulz had the castle rebuilt, and in 1641 it was burned again during the Thirty Years' War.

The Old Castle houses the rooms of the Bürger- und Narrenzunft 1503, a guild that also converted the former granary into an art gallery. The Tiengen local history museum is here too, with a permanent exhibition on five centuries of Jewish life in Tiengen.

The castle is privately owned and cannot be visited inside; the Old Castle houses the rooms of the Bürger- und Narrenzunft 1503 and the Tiengener Heimatmuseum. The complex stands on a low terrace about ten metres above the historic old town, directly beside the baroque parish church of Mariä Himmelfahrt, at the point where three valleys meet.

The Tiengen Castle Museum housed in the Old Castle section features exhibits dedicated to the history of the local Jewish community, displaying artifacts that tell this important story. Few visitors expect to encounter such a substantial collection documenting a multicultural chapter of the town's past.