Burg Reichenstein, Medieval castle in Puderbach, Germany.

Burg Reichenstein is a medieval stone castle perched on a mountain spur in the Westerwald region, featuring walls, towers, and multiple chambers within. The structure displays typical elements of a defensive fortress with fortified sections and residential areas that visitors can explore today.

Burg Reichenstein was first documented on 5 June 1208, when Wilhelm von Reichenstein held Frank von Cronberg prisoner there. Ludwig III von Reichenstein is credited with building the castle between 1310 and 1320 as a territorial stronghold and possible toll station. In 1331 Wilhelm I von Isenburg-Braunsberg forced Ludwig to enfeoff him with the newly built castle. It was already a ruin by the 16th century and was destroyed in 1618 by the Count of Wied.

The castle demonstrates medieval defensive architecture through its walls and towers, showing visitors how such structures were built to protect territory. The rooms inside reveal how people lived and worked within a fortification designed for both military and administrative purposes.

The ruin is open at set times, and festivals and events are held in and around the castle. A Förderverein (friends' association) maintains the site; restoration work included the Walpodenstube, a room seating about 30 guests. The grounds lie on a slope above the Holzbach, about 2 km northwest of Puderbach.

The castle was already described as a ruin in the 16th century; in 1618 the owner, the Count of Wied, destroyed it when the Count of Sayn tried to buy it. A partially filled well, once 40 metres deep, survives among the foundations, and the Walpodenstube in the ruin now seats about 30 guests.