Kerestinec Castle, Quadrangular castle in Sveta Nedelja, Croatia.

Kerestinec Castle is a quadrangular fortress near Zagreb featuring a two-story design with cylindrical corner towers and open arcades surrounding the internal courtyard. The square layout with these connecting galleries creates a defensive yet elegant structure typical of Renaissance castle architecture.

Construction began in 1575 under Petar II Erdödy, who built the fortress as a display of the family's growing power in the region. The moat surrounding the structure was part of broader defensive strategies that Croatian nobles employed during this period of territorial consolidation.

The castle is linked to the Kerestinec Revolt of 1936, when local peasants rose against the estate. Its name also recalls the Kerestinec peasants who lived around it and joined the great Peasant Revolt of 1573. Today the castle hosts various events through the year.

The castle is located in a quiet area outside Zagreb and is best reached by car from the city center. The warmer months offer the most comfortable conditions for exploring the outdoor areas and the surrounding grounds at your own pace.

On 19 April 1941 the Ustaše police directorate for Zagreb turned the castle into a collection camp, and during the NDH it also housed an officers' school. After 1945 it became a JNA barracks, then a Croatian Army barracks; trials over torture in the early 1990s earned it the nickname "Bloody Castle". Full renovation began in 2025.