Mikhail Sergeyevich Gorbachev (2 March 1931 – 30 August 2022) was a Soviet politician who served as the last leader of the Soviet Union from 1985 to the country's dissolution in 1991. He served as General Secretary of the Communist Party of the Soviet Union from 1985 and additionally as head of state beginning in 1988, as Chairman of the Presidium of the Supreme Soviet from 1988 to 1989, Chairman of the Supreme Soviet from 1989 to 1990 and the only President of the Soviet Union from 1990 to 1991. Ideologically, Gorbachev initially adhered to Marxism–Leninism but moved towards social democracy by the early 1990s.

Gorbachev is considered to be one of the most significant figures of the second half of the 20th century. The recipient of a wide range of awards, including the Nobel Peace Prize, he is praised for his role in ending the Cold War, introducing new political and economic freedoms in the Soviet Union, and tolerating both the fall of Marxist–Leninist administrations in eastern and central Europe and the reunification of Germany. In Russia he is often derided for facilitating the dissolution of the Soviet Union—an event which weakened Russia's global influence and precipitated an economic collapse in Russia and associated states.

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