Burgruine Reichenstein, Medieval castle ruins in Stadlern, Germany.

Burgruine Reichenstein is a hilltop castle ruin on the 874-metre summit of the Reichenstein in the Oberpfälzer Wald above Stadlern. Only small remnants of wall and the stump of the round bergfried survive. The site is recorded as a Bavarian archaeological monument (D-3-6441-0022) and as a protected building monument of Stadlern (D-3-76-167-9).

The castle's origins and builders are unknown; it likely arose in the 12th or 13th century above an early settlement. In the 13th century it belonged to the Bohemian lords of Hostau, and in 1333 the Landgraves of Leuchtenberg bought it. On 29 May 1350 they enfeoffed Pleistein and Reichenstein to King Charles IV of Bohemia. In 1514 Jobst Schlüsselfelder, Hans Reich and Hieronymus Holfelder bought the castle and town of Schönsee for 3,900 Rhenish guilders.

The name Reichenstein, "rich stone", points to the rocky summit at 874 metres. From the 16th century the estate was administered from Winklarn Castle, built for that purpose, while the hilltop itself decayed into the wall remnants and round keep stump seen today.

The ruins are accessible via established hiking trails from Stadlern with clear markings throughout the route. Information panels on-site provide context about the site and help visitors understand the remaining structures.

The Upper Palatinate region holds the highest concentration of medieval fortifications in all of Germany, with dozens of castles like Frauenstein, Flossenbürg, and Leuchtenberg scattered throughout the area. This extraordinary density makes the region exceptional for history enthusiasts and hikers wanting to explore from one castle to another.