Burg Lockenhaus (Hungarian Léka) is a castle and medieval fortress in the Guens Valley in the southeastern part of Lockenhaus, in Burgenland, eastern Austria. Burg Lockenhaus is 368 metres (1,207 ft) above sea level. 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 Geschriebenstein.