New Bolanden Castle, Medieval castle ruins on Schlossberg hill in Bolanden, Germany.

New Bolanden Castle is a ruined spur castle on the 276-metre Schlossberg hill east of Bolanden. Only a few wall remains of the rectangular complex survive, built of irregular grey, brown and tan stone, with a rounded remnant at the highest section. The neck ditch is still visible.

The fortress was built between 1200 and 1300 by nobles of House Bolanden and served as a seat of power for several centuries. French forces destroyed it in 1689, marking the end of its role as a functional defensive structure.

Three dowager duchesses of Palatinate-Simmern lived here: Margaret of Egmond (1480–1486), Johanna of Saarbrücken (1515–1521) and Anne Margareta of Palatinate-Veldenz (1598–1621). Anne Margareta's personal physician was Arnold Weickard, author of medical works and later city physician of Frankfurt.

The ruins sit on a hillside and are reached on foot with a moderate climb to the top. Wear sturdy shoes as the ground and pathways are uneven in places.

Arnold Weickard, a physician from Frankfurt and medical author, lived at the castle serving as personal doctor to one of its noble residents. His presence here connects the castle to the intellectual and scientific circles of his time.