Burg Lockenhaus is a castle and medieval fortress located in the Güns Valley in the southeastern part of Lockenhaus, in Burgenland, eastern Austria. The castle was built in Romanesque and Gothic architectural styles around 1200, and was initially called "Leuca" or Léka. It is part of the Naturpark
The castle is located in the Güns Valley, set amidst a hilly terrain in eastern Austria, near the Hungarian border towards Kőszeg. It is located in the southeastern part of the town of Lockenhaus, roughly 120 kilometres south of Vienna and roughly the same distance by road northeast of Graz. It was built on the spur of a hill, which is now called the Castle Hill. It can be reached by express bus service along the Eisenstadter Bundestrasse. A lake lies immediately to the east of the castle.