The Kingdom of Hungary is a multilingual, multiethnic and (as the meaning from the 19th century) multinational country in Central Europe covering what is today Hungary, Slovakia, Transylvania (now part of Romania), Carpathian Ruthenia (now part of Ukraine), Vojvodina (now part of Serbia), Burgenland (now part of Austria), and other smaller territories surrounding present-day Hungary's borders.

From 1102 it also includes Croatia (except Istria), being in personal union with it, united under the Hungarian king.

The kingdom exists for almost one thousand years (1000–1918 and 1920–1946) and at various points is regarded as one of the cultural centers of the Western world.