The Socialist Federative Republic of Councils in Hungary was a short-lived communist state that existed from 21 March 1919 to 1 August 1919, succeeding the First Hungarian Republic. The Hungarian Soviet Republic was a small communist rump state which, at its time of establishment, controlled approximately only 23% of Hungary's historic territory. The head of government was Sándor Garbai, but the influence of the foreign minister Béla Kun of the Party of Communists in Hungary was much stronger. Unable to reach an agreement with the Triple Entente, which maintained an economic blockade of Hungary, in dispute with neighboring countries over territorial disputes, and beset by profound internal social changes, the soviet republic failed in its objectives and was abolished a few months after its existence. Its main figure was the Communist Béla Kun, despite the fact that in the first days the majority of the new government consisted of radical Social Democrats. The new system effectively concentrated power in the governing councils, which exercised it in the name of the working class.

Sándor Garbai was a Hungarian socialist politician who served as both head of state and prime minister the de jure leader of the Hungarian Soviet Republic.