 Kọ itẹsiwaju fun paragirafi yii - Austria-Yugoslavia ibasepọ jẹ awọn ibasepọ ajeji itan laarin Austria ati Yugoslavia ti o ti fọ. Àwọn orílẹ-èdè méjèèjì ni wọn dá sílẹ nígbà tí Austria-Hungary tú ká lọdún 1918. Orilẹ-ede Austrian akọkọ jẹ ipinle oludasile ti ijọba, lakoko ti a ṣẹda Yugoslavia lẹhin iṣọkan ti ijọba ijọba ti Serbia ṣaaju Ogun Agbaye akọkọ pẹlu Ipinle ti awọn Slovenes, Croats ati Serbs awọn apakan Slavic South ti Austria-Hungary. Ni awọn ọjọ ṣaaju iṣọkan yii, ijọba Serbia darapọ mọ Banat, Bačka ati Baranja ati ijọba Montenegro. Lakoko akoko laarin ogun ti itan-akọọlẹ Yuroopu, awọn ibatan laarin Ijọba Austrian akọkọ ati Ijọba Yugoslavia ni a samisi nipasẹ rogbodiyan Austro-Slovene ni Carinthia, 1920 Carinthian plebiscite : , 1920 idasilẹ ti pro-status quo Little Entente, 1934 Awọn iwe adehun Rome laarin revanchist Austria, Hungary ati Fascist Italy ati 1938 Anschluss. 