Preitenstein Castle, Medieval castle ruins in Nečtiny, Czech Republic.

Preitenstein Castle is a medieval fortress ruin located above Nečtiny with substantial stone walls and palace buildings still visible from its original construction. The site displays the defensive layout typical of fortifications from this period, with earthen ramparts and traces of former moats.

King John of Luxembourg built the castle after 1330 at his own expense and immediately pledged it to Oldřich Pluh of Rabštejn, who held it as a pledge from 1330 to 1333. Charles IV bought it back after 1333 and listed it in his Majestas Carolina among castles that must not be pledged. It burned in 1549 after its owner Kašpar Pluh of Rabštejn joined the 1547 estates' revolt and fled the country.

The castle was originally called Breitenstein, later Czechized to Preitenstein. Oldřich Pluh, its pledge holder from 1330 to 1333, founded a village below the castle that was later renamed Nečtiny, while the original Nečtiny was promoted to a market town.

The ruins are accessible year-round by following marked trails from Nečtiny, with local information available at the town office. Proper footwear is recommended for walking through the site as terrain can be uneven.

Inside the palace building stands a large vaulted chamber connected to other parts by a preserved corridor system that reveals medieval construction methods. The passageways show how spaces were connected and used within the fortress.