Prnjavor (Serbian Cyrillic: Прњавор, pronounced [prɲǎːʋɔr]) is a city and municipality in Republika Srpska, Bosnia and Herzegovina.

[1] The municipality is located in the basin of the Ukrina river and is characterized by a mostly lowland hilly terrain configuration with the highest peak of 594m (mountain Ljubić).

On the river Vijaka in the foothills of Ljubić there is a man made lake Drenova and further downstream there are Ribnjak fishing grounds.

A significant number of Bosnians converted to Islam after the conquest by the Ottoman Empire in the second half of the 15th century, giving it a unique character within the Balkan region.

This conversion appears to have been not sudden but a gradual process based on various rules imposed by the Ottomans — it took more than a hundred years for the number of Muslims to become the majority religion.

The general view among scholars is that the Islamization of the Bosnian population was not the result of violent methods of conversions but was, for the most part, peaceful and voluntary.

Efforts were undertaken to attract settlers from other parts of the empire and consequently the municipal area was settled by Italians, Ukrainians, Czechs, Poles, Hungarians and German-speaking folk from Austria, Germany, Bohemia, Hungary and Russia.

During the interwar period between 1918 and 1941 Prnjavor underwent more significant economic development through the opening of craftsman workshops, hotels, more shops and a few manufacturing plants.

Following the collapse of internal security during World War II the Nazis decided to evacuate the Volksdeutsche (ethnic German) population from Bosnia and a treaty to this effect was signed with the Croatian Ustaše regime on 30 September 1942.

After 1945 the Communist regime of Josip Broz Tito repopulated the Volksdeutsche villages with Serbs and destroyed or obscured all evidence of German history and heritage in the region.

After the war that erupted after the collapse of the Socialist Federal Republic of Yugoslavia (SFRY), Prnjavor became part of the North-Eastern entity of Bosnia and Herzegovina, the Republika Srpska, as per the Dayton Agreement.

At the time of the former Socialist Federal Republic of Yugoslavia and due to numerous national minorities (about 20) Prnjavor was called "Little Europe".

But, even today, besides the constitutive nations of Serbs, Croats, and Bosniaks, a small number of Hungarians, Slovaks, Germans, Polish, Slovenes, Bulgarians, Romanians, Macedonians, Jews, and Russians live in Prnjavor.

New greenhouses are being constructed, health food production (organic agriculture) projects have been started to which the Municipality of Prnjavor has great predispositions due to the lack of significant industrial capacities as well as the preserved nature.

The Roman Catholic church of Saint Anthony of Padua, located in the town of Prnjavor was built in 1909 during the Austro-Hungarian empire.

Prnjavor is twinned with:[10] Una-Sana  Central Bosnia Posavina  Herzegovina-Neretva Tuzla  West Herzegovina Zenica-Doboj  Sarajevo Bosnian Podrinje Canton 10