The State of Slovenes, Croats and Serbs (Država Slovenaca, Hrvata i Srba) was a short-lived state formed from the southernmost parts of the Austrian-Hungarian monarchy after its dissolution at the end of the World War I by the resident population of Slovenes, Croats and Serbs. Note that the Serbs referred to in the State's name are those resident in Bosnia and Croatia, not the population of Serbia.

The State was officially formed on October 29, 1918. Its governing body was the People's Council (Narodno vijeće), composed ad hoc of influential politicians at the time. The President was a Slovene Dr Anton Korošec . The two vice presidents were a Serb Svetozar Pribičević and a Croat, Dr Ante Pavelić (not to be confused with Ante Pavelić who was the leader of the regime set up by the Germans in Croatia in 1941).

The state was not internationally recognized before the People's Council joined it with the Kingdoms of Serbia and Montenegro and formed the Kingdom of Serbs, Croats and Slovenes on the 1st of December, 1918.

See also: History of Yugoslavia