Leninism is a political ideology developed by Russian Marxist revolutionary Vladimir Lenin that proposes the establishment of the dictatorship of the proletariat led by a revolutionary vanguard party as the political prelude to the establishment of communism. Lenin's ideological contributions to the Marxist ideology relate to his theories on the party, imperialism, the state, and revolution. The function of the Leninist vanguard party is to provide the working classes with the political consciousness and revolutionary leadership necessary to depose capitalism.

Vladimir Ilyich Ulyanov, better known as Vladimir Lenin, was a Russian revolutionary, politician, and political theorist. He served as the first and founding head of government of the Russian Soviet Federative Socialist Republic from 1917 until his death in 1924, and of the Soviet Union from 1922 until his death. Under his administration, Russia, and later the Soviet Union, became a one-party socialist state governed by the Communist Party. Ideologically a Marxist, his developments to the ideology are called Leninism.