Zrin Castle (Gradina Zrin) is a ruined castle located in the village of Zrin, south of the town of Sisak in Dvor municipality, central Croatia.

The castle was first mentioned in the 13th century as a fortress ruled by the Babonić clan.

In 1347, King Louis I the Great bestowed the fortress to the noble Šubić family who then changed their family name after it, becoming the Zrinski.

It remained in their possession until the Ottoman invasion and conquest of the region, which led to the fortress falling to them on 20 October 1577.

This article about a castle in Croatia is a stub.