The Kyffhäuser Monument, also known as Barbarossa Monument, is an Emperor William monument in the Kyffhäuser mountain range in the German state of Thuringia. It was erected from 1890 to 1896 atop the ruins of the medieval Kyffhausen Castle near Bad Frankenhausen.

The Kyffhäuser is a hill range in Central Germany, shared by Thuringia and Saxony-Anhalt, southeast of the Harz mountains. It reaches its highest point at the Kulpenberg with an elevation of 473.4 m (1,553 ft). The range is the site of medieval Kyffhausen Castle and the 19th century Kyffhäuser Monument; it has significance in German traditional mythology as the legendary resting place of Emperor Frederick Barbarossa.