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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.
In the castle grounds is a water tower constructed in 1899, now a protected monument, which was restored in 1992. The approach from the north-west to the main gate is marked by two stone lions on pedestals, standing at the entrance to an avenue between clipped oaks. On the adjacent castle grounds are a wildlife reserve and a bird of prey sanctuary.