The First Hungarian Republic (Hungarian: Első magyar köztársaság) or by its contemporary name Hungarian People's Republic (Hungarian: Magyar Népköztársaság) was a short-lived people's republic that existed, apart from a 133-day interruption, from late 1918 until mid-1919. It was established in the wake of the dissolution of the Austro-Hungarian Empire following World War I. The Hungarian People's Republic replaced the Kingdom of Hungary and was in turn replaced by another short-lived state.
During this period, Hungary was forced to cede lands for the formation of nations based on majority-ethnic groups, who formed Czechoslovakia, Romania, and Yugoslavia, made up of Serbians, Croatians and Slovenes.
"Hungarian People's Republic" was adopted as the official name of the country on 16 November 1918 and remained in use until the overthrow of the Dénes Berinkey government on 21 March 1919. Following the collapse of the Hungarian Soviet Republic, the Gyula Peidl government restored the pre-communist name of the state on 2 August 1919. The government of István Friedrich changed the name to "Hungarian Republic" on 8 August; however, the denomination "Hungarian People's Republic" appeared on some government-issued decrees during this period.