Countries and territories where Croatian is an official language

Croatia, officially the Republic of Croatia, is a country in Central and Southeast Europe, on the coast of the Adriatic Sea. It borders Slovenia to the northwest, Hungary to the northeast, Serbia to the east, Bosnia and Herzegovina and Montenegro to the southeast, and shares a maritime border with Italy to the west. Its capital and largest city, Zagreb, forms one of the country's primary subdivisions, with twenty counties. Other major urban centers include Split, Rijeka and Osijek. The country spans , and has a population of nearly 3.9 million.

Vojvodina (, , ), officially the Autonomous Province of Vojvodina (), is an autonomous province in northern Serbia. It encompasses the historical and geographical regions of Bačka, Banat, Syrmia, and northernmost part of Mačva, lying to the north of the national capital Belgrade and the Sava and Danube rivers. Vojvodina has 1.7 million inhabitants, about a quarter of the country's population, and its administrative centre, Novi Sad, is the second largest city in Serbia.

political entity within the sovereign country of Bosnia and Herzegovina

World War II-era puppet state of Nazi Germany and Fascist Italy (April 1941-May 1945)