Ostrožac Castle, Medieval fortress in Ostrožac, Bosnia and Herzegovina.

Ostrožac Castle stands in the village of Ostrožac, in the municipality of Cazin, Una-Sana Canton. It was built from 1286 as a possession of the Blagaj branch of the Babonić, a Croatian noble family. The complex was enlarged between 1900 and 1906 with a small addition for members of the Habsburg family. Its courtyard now holds more than 150 monumental sculptures carved in bihacite stone.

Ostrožac Castle was built in 1286 as a possession of the Babonić family, Croatian nobles who ruled this area. In 1592 the castle was captured by the Ottoman Empire and became part of the Ottoman province of Bosnia. Between 1900 and 1906 it was rebuilt by Lothar von Berks, mayor of Bihać, as a birthday present for his wife, a member of the Habsburg family.

Since 1969 the castle has hosted the Colony of Sculptors, Ostrožac, a gathering that has produced monumental works carved from bihacite stone. More than 150 of these sculptures remain in the courtyard as a permanent open-air exhibition. Cazin and Ostrožac civic and tourism groups use the grounds for concerts, shows and performances.

The castle stands in the village of Ostrožac on the outskirts of Cazin, in the Una-Sana Canton. The complex is under slow repair, with only the most urgent works done so far, so some parts may be closed off. The courtyard holds the sculpture park, and the grounds are used by Cazin and Ostrožac organisations for concerts and shows.

The castle courtyard holds over 150 stone sculptures created during an annual sculptors' workshop. These artworks turn the historical grounds into an open-air gallery where visitors can discover contemporary creations.