Bačka (Serbian: Бачка Hungarian: Bácska) is an area of the Pannonian plain lying between the rivers Danube and Tisza.
Historically a part of the Kingdom of Hungary, the southern part of the area was transferred by the Treaty of Trianon (4 June 1920) to the newly created Kingdom of Serbs, Croats and Slovenes (later renamed Yugoslavia, today Serbia and Montenegro).
In 1941 Yugoslavian Bačka was reincorporated into Hungary by the Axis powers. The Trianon frontier was restored in 1945 with the end of the Second World War, southern Bačka becoming part of the Socialist Federal Republic of Yugoslavia. Today it forms part of the Vojvodina region of Serbia and Montenegro. Novi Sad, the capital city of Vojvodina, stands on the border between Bačka and Srem.
Some of the major cities in Bačka include: