Gräfenstein Castle is a ruined rock castle about 2 kilometres (1.2 mi) east of the village of Merzalben in the German state of Rhineland-Palatinate. It is in the county of Südwestpfalz within the Palatine Forest and is often called Merzalber Schloss. It is built on a rock plateau 12 metres (39 ft) high at an elevation of 447 metres (1,467 ft) above sea level.

The Palatinate Forest, sometimes also called the Palatine Forest, is a low-mountain region in southwestern Germany, located in the Palatinate in the state of Rhineland-Palatinate. The forest is a designated nature park covering 1,771 km2 and its highest elevation is the Kalmit.