The Republic of Prekmurje was an unrecognized state in Prekmurje, an area traditionally known in Hungarian as Vendvidék . On June 6, 1919, Prekmurje was incorporated into the newly established Kingdom of Serbs, Croats and Slovenes.

Prekmurje is a geographically, linguistically, culturally and ethnically defined region of Slovenia, settled by Slovenes and a Hungarian minority, lying between the Mur River in Slovenia and the Rába Valley in the westernmost part of Hungary. It maintains certain specific linguistic, cultural and religious features that differentiate it from other Slovenian traditional regions. It covers an area of 938 square kilometers (362 sq mi) and has a population of 78,000 people.