Cappenberg Castle (German: Schloss Cappenberg) is a former Premonstratensian monastery, Cappenberg Abbey (German: Kloster Cappenberg) in Cappenberg, a part of Selm, North Rhine-Westphalia in Germany. It stands on an elevation, the Cappenberg, near Lünen and Werne, and is a vantage point offering views over the eastern Ruhrgebiet.