The Museum of Modern Art of Republika Srpska is the main art institution in Banja Luka, holding a collection that spans Yugoslav modernism and contemporary work from the post-war period. The building sits close to the city centre and regularly hosts temporary exhibitions alongside the permanent collection.
The permanent holdings include paintings, sculptures, and prints by artists from Bosnia and the broader former Yugoslavia, with a particular emphasis on the 20th century. If you have a broader interest in art from the region, this is the best place in Banja Luka to encounter it. Admission is modest; check locally for current hours and exhibition listings.