The Triune Kingdom or Triune Kingdom of Croatia, Slavonia and Dalmatia was the concept—advocated by the leaders of the 19th-century Croatian national revival—of a united kingdom between Croatia, Slavonia and Dalmatia, which were already within the Austrian Empire under one king, who was also the Emperor of Austria, but were politically and administratively separate entities. This concept had roots in the high medieval period, as a successor to the historical Kingdom of Croatia which was made up of those regions.

The Illyrian movement was a pan-South-Slavic cultural and political campaign with roots in the early modern period, and revived by a group of young Croatian intellectuals during the first half of the 19th century, around the years of 1835–1863. This movement aimed to create a Croatian national establishment in Austria-Hungary through linguistic and ethnic unity, and through it lay the foundation for cultural and linguistic unification of all South Slavs under the revived umbrella term Illyrian.