Ruppertstein Castle (German: Burg Ruppertstein) is the ruins of a hill castle located at an elevation of 452 m above sea level (NN) near the village of Lemberg in the collective municipality of Pirmasens-Land in the county of Südwestpfalz in the German state of Rhineland-Palatinate.

It is situated on top of the Ruppertstein hill south of the village of Ruppertsweiler.

Its history began in 1198 with the purchase by Henry I, Count of Zweibrücken, of the hill on which it was built.

It was either destroyed in 1525 during the Palatine Peasants' War or had been allowed to fall into ruins by then.

This stone stairway was refurbished in 2007 by the Pirmasens-Land municipal authorities.