Castle of Diósgyőr, Medieval castle in Miskolc, Hungary

The Castle of Diósgyőr is a Gothic castle in Diósgyőr, now part of Miskolc. Its rectangular courtyard is framed by four corner towers, and the Knights' Hall on the upper floor measures 13 by 25 metres, supported by three columns. A moat four metres deep once surrounded the castle, fed by warm springs.

The first castle here, probably a 12th-century earthwork, was destroyed in the Mongol invasion of 1241–42; the Gothic castle standing today was built after it, likely under Béla IV. From 1340 it was a royal castle, usually held by the queens of Hungary. Louis the Great made it one of his residences from the 1360s, rebuilt it, and its 13×25 m Knights' Hall was completed under his daughter Mary.

The castle hosts the Castle Plays twice a year, in May and August, with tournaments and open-air performances, plus a medieval fair beside the walls. The Kaláka Folk Festival takes place on the second weekend of July. A large waxworks exhibition in the outer castle shows six scenes of everyday life in medieval Diósgyőr.

The north-western tower serves as a lookout over Diósgyőr and the surrounding hills, while the south-western tower stands in ruins. The castle is ringed by modern concrete buildings rather than a historic town. The Castle Plays take place twice a year, in May and August, and the Kaláka Folk Festival falls on the second weekend of July.

The mint on the ground floor of the north-western tower lets visitors strike commemorative coins by hand; the same tower serves as a lookout over Diósgyőr and the surrounding hills. The south-western tower, by contrast, still stands in ruins.