The 1980 Summer Olympics, officially known as the Games of the XXII Olympiad (Russian: И́гры XXII Олимпиа́ды, tr. Igry XXII Olimpiady), was an international multi-sport event held in Moscow, Soviet Union, in present-day Russia.

The 1980 Games were the first Olympic Games to be staged in Eastern Europe, and remain the only Summer Olympics held there, as well as the first Olympic Games to be held in a Slavic language-speaking country. They were also the first Olympic Games to be held in a socialist country, and the only Summer Games to be held in such a country until 2008 in Beijing, China. These were the final Olympic Games under the IOC Presidency of Michael Morris, 3rd Baron Killanin.

Eighty nations were represented at the Moscow Games – the smallest number since 1956. Led by the United States at the insistence of US President Jimmy Carter, 66 countries boycotted the games entirely because of the Soviet invasion of Afghanistan. Some athletes from some of the boycotting countries (they are not included in the list of 66 countries that boycotted the games entirely) participated in the games under the Olympic Flag. This prompted the Soviet-led boycott of the 1984 Summer Olympics.

The only two cities to bid for the 1980 Summer Olympics were Moscow and Los Angeles. The choice between them was made on 23 October 1974 in the 75th IOC Session in Vienna, Austria. Los Angeles would eventually host the 1984 Summer Olympics.

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