Bad Radkersburg (German pronunciation: [ˈbaːt ˈʁatkɐsbʊʁk]; Slovene: Radgona; archaic Hungarian: Regede[3]) is a spa town in the southeast of the Austrian state of Styria, in the district of Südoststeiermark.

Located near the border with the Kingdom of Hungary, it was affected by the armed conflict between King Matthias Corvinus and Emperor Frederick III in the late 15th century.

In the course of the 19th century language conflict, nationalist struggles in the ethnically mixed area arose between the predominantly German-speaking citizens and the Slovene-speaking peasant population down the Mur River.

A garrison town of the Austro-Hungarian Army in World War I, it was occupied by troops of the newly emerged Kingdom of Serbs, Croats and Slovenes (Yugoslavia) on 1 December 1918.

Nevertheless, by resolution of the 1919 Treaty of Saint-Germain, the area north of the Mur passed to the First Austrian Republic, while Oberradkersburg (Gornja Radgona) and the neighbouring municipality of Apače (Abstall), on the south bank, became part of Yugoslavia.