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Within the Soviet Union

In the Soviet Union, a cult of personality devoted to Lenin began to develop during his lifetime, but was only fully established after his death. According to historian Nina Tumarkin, it represented the world's "most elaborate cult of a revolutionary leader" since that of George Washington in the United States, and has been repeatedly described as "quasi-religious" in nature. Busts or statues of Lenin were erected in almost every village, and his face adorned postage stamps, crockery, posters, and the front pages of Soviet newspapers Pravda and Izvestia. The places where he had lived or stayed were converted into museums devoted to him. Libraries, streets, farms, museums, towns, and whole regions were named after him, with the city of Petrograd being renamed "Leningrad" in 1924, and his birthplace of Simbirsk becoming Ulyanovsk. The Order of Lenin was established as one of the country's highest decorations. All of this was contrary to Lenin's own desires and was publicly criticised by his widow.

Various biographers have stated that Lenin's writings were treated in a manner akin to holy scripture within the Soviet Union, while Pipes added that "his every opinion was cited to justify one policy or another and treated as gospel." Stalin systematised Leninism through a series of lectures at the Sverdlov University, which were then published as Questions of Leninism. Stalin also had much of the deceased leader's writings collated and stored in a secret archive in the Marx–Engels–Lenin Institute. Material such as Lenin's collection of books in Kraków was also collected from abroad for storage in the institute, often at great expense. During the Soviet era, these writings were strictly controlled and very few had access. All of Lenin's writings that proved useful to Stalin were published, but the others remained hidden, and knowledge of both Lenin's non-Russian ancestry and his noble status was suppressed. In particular, knowledge of his Jewish ancestry was suppressed until the 1980s, perhaps out of Soviet antisemitism, and so as not to undermine Stalin's Russification efforts, and perhaps so as not to provide fuel for anti-Soviet sentiment among international antisemites. After the discovery of Lenin's Jewish ancestry, this aspect was repeatedly emphasised by the Russian far-right, who claimed that his inherited Jewish genetics explained his desire to uproot traditional Russian society. Under Stalin's regime, Lenin was actively portrayed as a close friend of Stalin's who had supported Stalin's bid to be the next Soviet leader. During the Soviet era, five separate editions of Lenin's published works were published in Russian, the first beginning in 1920 and the last from 1958 to 1965; the fifth edition was described as "complete", but in reality, had much omitted for political expediency.

After Stalin's death, Nikita Khrushchev became leader of the Soviet Union and began a process of de-Stalinisation, citing Lenin's writings, including those on Stalin, to legitimise this process. When Mikhail Gorbachev took power in 1985 and introduced the policies of glasnost and perestroika, he too cited these actions as a return to Lenin's principles. In late 1991, amid the dissolution of the Soviet Union, Russian President Boris Yeltsin ordered the Lenin archive be removed from Communist Party control and placed under the control of a state organ, the Russian Centre for the Preservation and Study of Documents of Recent History, at which it was revealed that over 6,000 of Lenin's writings had gone unpublished. These were declassified and made available for scholarly study. Since 1991, there has been some discussion about moving Lenin's body from the mausoleum to the Kremlin Wall Necropolis and burying it there. President Boris Yeltsin, with the support of the Russian Orthodox Church, intended to close the mausoleum and bury Lenin next to his mother, Maria Alexandrovna Ulyanova, at the Volkov Cemetery in St. Petersburg. His successor, Vladimir Putin, opposed this, stating that a reburial of Lenin would imply that generations of citizens had observed false values during seventy years of Soviet rule.

In Russia in 2012, a proposal from a deputy belonging to the Liberal Democratic Party of Russia, with the support of some members of the governing United Russia party, proposed the removal of Lenin monuments in Russia. The proposal was strongly opposed by the Communist Party of the Russian Federation and was never considered. Russia retained the vast majority of the 7,000 Lenin statues extant in 1991; as of 2022, there were approximately 6,000 monuments to Lenin in Russia.

In Ukraine, during the 2013–14 Euromaidan protests, Lenin statues were damaged or destroyed by protesters in various cities across the country, and in April 2015 the Ukrainian government ordered that all others be dismantled to comply with decommunisation laws. During the Russia's full-scale invasion of Ukraine in 2022, many Lenin statues which had been taken down by Ukrainian activists in the preceding years, were re-erected by Russian occupiers in Russian-controlled areas. These actions have less to do with communist propaganda and more with Lenin symbolizing Russia's domination over Ukraine. A 2017 Levada poll found that 56% of Russians believed that Lenin played a positive role in the country's history whilst 22% believed he had a negative role.