Mokrsko Górne Castle, Castle ruins in Mokrsko Górne, Poland

Mokrsko Górne Castle is a ruined late Gothic castle built in the 15th century and expanded around 1520–1540 in Renaissance style. It stood on a rectangular plan of about 25 by 45 metres on the right bank of the Nida. The west range held a three-storey residential building of some 300 m², and a gate tower projected from the south side.

Construction of the fortress began in the late 1300s under the initiative of Bishop Florian of Krakow or his brother Klemens, castellan of Radom. This stronghold was part of the network of castles built by these influential families to control their territories.

The castle's name comes from the village of Mokrsko, first recorded in 1309 as the property of Piotr of the Jelita coat of arms. In 1531 Queen Bona Sforza bought the estate for 2,000 florins, and the Renaissance stonework may date from her time. The window frames at Mokrsko closely match those on the second floor of the royal castle in Piotrków Trybunalski and in Sigismund I's palace on Wawel.

The ruins are easily accessible on foot and can be examined from the outside, with the basic structures clearly visible. The marshy surroundings can be wet, especially after rainfall, so proper footwear is advisable.

The castle's window frames matched those on the second floor of the royal castle in Piotrków Trybunalski and in King Sigismund I the Old's palace at Wawel. This detail suggests the Mokrsko residence was built to a standard associated with royal workshops.