Yugoslavia (; lit. 'Land of the South Slavs'; Serbo-Croatian: Jugoslavija / Југославија [juɡǒslaːʋija]; Slovene: Jugoslavija [juɡɔˈslàːʋija]; Macedonian: Југославија [juɡɔˈsɫavija]) was a country in Southeast and Central Europe that existed from 1918 to 1992. It came into existence following World War I, under the name of the Kingdom of Serbs, Croats and Slovenes from the merger of the Kingdom of Serbia with the provisional State of Slovenes, Croats and Serbs, and constituted the first union of South Slavic peoples as a sovereign state, following centuries of foreign rule over the region under the Ottoman and Habsburg empires. Peter I of Serbia was its first sovereign. The kingdom gained international recognition on 13 July 1922 at the Conference of Ambassadors in Paris. The official name of the state was changed to Kingdom of Yugoslavia on 3 October 1929.

The kingdom was invaded and occupied by the Axis powers in April 1941. In 1943, Democratic Federal Yugoslavia was proclaimed by the Partisan resistance. In 1944, King Peter II, then living in exile, recognised it as the legitimate government. After a communist government was elected in November 1945, the monarchy was abolished, and the country was renamed the Federal People's Republic of Yugoslavia. It acquired the territories of Istria, Rijeka, and Zadar from Italy.