The Banate of Bosnia is a medieval state based on most of what is today Bosnia and Herzegovina, as well as parts of Dalmatia, Serbia and Montenegro.

Although nominally in vassalage to the Kingdom of Hungary, the Banate of Bosnia is a de facto independent Bosnian state It exists until 1377, when it is proclaimed a Kingdom with the coronation of Bosnian King Tvrtko I.

The greater part of its history is marked by a religiopolitical controversy revolving around the native Bosnian Church condemned as heretical by both the Roman Catholic and Eastern Orthodox churches, although with the Catholic church being particularly antagonistic and persecuting its members through the Hungarians.