In 1918, Beočin first became part of the State of Slovenes, Croats and Serbs, then part of the Kingdom of Serbia and finally part of the Kingdom of Serbs, Croats and Slovenes (later renamed to Yugoslavia). From 1918 to 1922, Beočin was part of the Syrmia county, from 1922 to 1929 part of the Syrmia oblast, from 1929 to 1939 part of the Danube Banovina, and from 1939 to 1941 part of the Banovina of Croatia. During World War II, from 1941 to 1944, Beočin was occupied by Axis troops and was included into the Pavelić's Independent State of Croatia. During the Axis occupation, 66 civilians were killed in Beočin by fascists. In 1944, Beočin was liberated by Yugoslav partisans. Since 1944, the town is part of Vojvodina, which (from 1945) was an autonomous province of Serbia and Yugoslavia.