Runkelstein Castle (German: Schloss Runkelstein; Italian: Castel Roncolo) is a medieval fortification on a rocky spur in the territory of Ritten, near the city of Bolzano in South Tyrol, Italy. In 1237 Alderich Prince-Bishop of Trent gave the brothers Friedrich and Beral Lords of Wangen permission to construct a castle on the rock then called Runchenstayn.