Krupa na Uni (Serbian Cyrillic: Крупа на Уни) is a municipality in northern Republika Srpska, Bosnia and Herzegovina. It is situated in the north-western part of the Republika Srpska entity and the central part of the Bosanska Krajina region. It was created from part of the pre-war municipality of Bosanska Krupa (the other part of the pre-war municipality that is now in the entity of Federation of Bosnia and Herzegovina).