Krupa na Uni (Serbian Cyrillic: Крупа на Уни) is a municipality in Republika Srpska, Bosnia and Herzegovina.

The seat of the municipality is the village of Donji Dubovik.

It was created in 1995, formerly being a part of the pre-war municipality of Bosanska Krupa (the other part of the pre-war municipality that is now in the entity of the Federation of Bosnia and Herzegovina).

As of 2019, it is one of the smallest municipalities by the number of inhabitants in Republika Srpska.

Una-Sana  Central Bosnia Posavina  Herzegovina-Neretva Tuzla  West Herzegovina Zenica-Doboj  Sarajevo Bosnian Podrinje Canton 10