Eltz Castle (German: Burg Eltz) is a medieval castle nestled in the hills above the Moselle River between Koblenz and Trier, Germany. It is still owned by a branch of the same family (the Eltz family) that lived there in the 12th century, 33 generations ago. Bürresheim Castle (Schloss Bürresheim), Eltz Castle and Lissingen Castle are the only castles on the left bank of the Rhine in Rhineland-Palatinate which have never been destroyed.
The castle is surrounded on three sides by the Elzbach River, a tributary on the north side of the Moselle. It is on a 70-metre (230 ft) rock spur, on an important Roman trade route between rich farmlands and their markets. The Eltz Forest has been declared a nature reserve by Flora-Fauna-Habitat and Natura 2000.
Platteltz, a Romanesque keep, is the oldest part of the castle, having begun in the 9th century as a simple manor with an earthen palisade. By 1157 the fortress was an important part of the empire under Frederick Barbarossa, standing astride the trade route from the Moselle Valley and the Eifel region. In 1472 the Rübenach house, built in the Late Gothic style, was completed. Remarkable are the Rübenach Lower Hall, a living room, and the Rübenach bedchamber with its opulently decorated walls.
Between 1490 and 1540, the Rodendorf house was constructed, also in Late Gothic style. It contains the vaulted "banner-room".
The Kempenich houses were finished about 1530. Every room of this part of the castle could be heated; in contrast, other castles might only have one or two heated rooms.