Nanstein Castle is a ruined medieval spur castle above the town of Landstuhl, Germany, which has been partially reconstructed. Built in the 12th century, the red sandstone rock castle was once owned by Franz von Sickingen who was mortally wounded during a siege of the castle in 1523.

Landstuhl, officially the Sickingen Town of Landstuhl, is a town in the Kaiserslautern district of Rhineland-Palatinate in Germany. It is the seat of the Municipal Association of Landstuhl. Situated on the north-west edge of the Palatinate Forest, 11 miles (18 km) west of the city of Kaiserslautern, the town is located near Ramstein Air Base.