Falkenstein Castle (German: Burg Falkenstein) is a German castle in the Harz mountains dating to the High Middle Ages period. It is located in the town of Falkenstein/Harz between Aschersleben and Harzgerode.
The castle lies high above the Selke valley in the district of Harz in the German state of Saxony-Anhalt.
Falkenstein was built between 1120 and 1180 and has been modified frequently since then, but still retains the character of a medieval castle. It has a commanding location and was never captured.
According to legend, Falkenstein Castle has its origins in a murder: around 1080 Egeno II of Konradsburg slew Count Adalbert of Ballenstedt in a fight, whereupon the seat of the killer was to have been converted into a monastery. As a result, Egeno's son, Burchard von Konradsburg, had the new Falkenstein Castle built.
In 1220, during the reign of Prince Henry of Anhalt the Anhalt ministerialis, Eike von Repgow, from Reppichau drew up here the Sachsenspiegel the first German law book. The book is dedicated to its commissioner, Hoyer von Falkenstein.
Today the castle and its museum are one of the most popular destinations in the Harz mountains. It is part of the Romanesque Road. The castle has a falconry and a restaurant that offer traditional castle food (Ritteressen).
The castle was one of several backdrops in the seven-part children's series shot by GDR television, Spuk unterm Riesenrad, and one of the locations for the DEFA fairy tale film Schneeweißchen and Rosenrot ("Snow White and Rose Red"), as well as films in the GDR series Polizeiruf 110 The Entdeckung.