Bischofstein Castle (German: Burg Bischofstein) is a castle by the Moselle in Germany. It sits between Moselkern and Hatzenport; these and the castle face the borough of Burgen. It was a stronghold belonging to the Archbishops of Treves. Characteristics are its tall, cylindrical tower girt midway-up with white plaster and the ruinous walls of a small chapel adjoining. The tower is specifically a donjon, (a keep).