The siege of Budapest or battle of Budapest was the 50-day-long encirclement by Soviet and Romanian forces of the Hungarian capital of Budapest, near the end of World War II. Part of the broader Budapest Offensive, the siege began when Budapest, defended by Hungarian and German troops, was encircled on 26 December 1944 by the Red Army and the Romanian Army. During the siege, about 38,000 civilians died through starvation, military action, and mass executions of Jews by the far-right Hungarian nationalist Arrow Cross Party. The city unconditionally surrendered on 13 February 1945. It was a strategic victory for the Allies in their push towards Berlin.
Having suffered nearly 200,000 deaths in three years fighting the Soviet Union, and with the front lines approaching its own cities, Hungary was by early 1944 ready to exit World War II. As political forces within Hungary pushed for an end to the fighting, Germany preemptively launched Operation Margarethe on 19 March 1944, and entered Hungary.
In October 1944, after successive Allied victories at Normandy and Falaise, and after the collapse of the Eastern Front following the stunning success of the Soviet summer offensive, Operation Bagration, Regent of Hungary Miklós Horthy again attempted to negotiate a separate peace with the Allies. Upon hearing of Horthy's efforts, Hitler launched Operation Panzerfaust to keep Hungary on the Axis side, and forced Horthy to abdicate. Horthy and his government were replaced by the far-right National Socialist Arrow Cross Party, led by "Hungarist" Ferenc Szálasi. As the new ultra-nationalist government and its German allies prepared the defense of the capital, IX SS Mountain Corps, consisting of two Waffen-SS divisions, was sent to Budapest to strengthen the city's defense.
The besieging Soviet forces were part of Rodion Malinovsky's 2nd Ukrainian Front. Formations that actually took part in the fighting appear to have included the 53rd Army, 7th Guards Army, portions of the 3rd Ukrainian Front, including the 46th Army, and the Romanian 7th Army Corps.