The 1984 Summer Olympics, officially known as the Games of the XXIII Olympiad, was an international multi-sport event held in Los Angeles, California, United States in 1984. This was the second occasion Los Angeles hosted the games, the first being in 1932.

Where ambitious construction for the 1976 games in Montreal and 1980 games in Moscow had saddled organizers with expenses greatly in excess of revenues, Los Angeles strictly controlled expenses by using existing facilities except a swim stadium and a velodrome that were paid for by corporate sponsors. The Olympic Committee led by Peter Ueberroth used some of the profits to endow the LA84 Foundation to promote youth sports in Southern California, educate coaches and maintain a sports library. The 1984 Summer Olympics are often considered the most financially successful modern Olympics.

The host state of California was the home state of U.S. President Ronald Reagan, who officially opened the Games. He had served as Governor of California from 1967 to 1975. The official mascot of the Los Angeles Games was Sam the Olympic Eagle. The logo of the games featured five blue, white and red stars arranged horizontally and struck through with alternating streaks; it was named "Stars in Motion." These were the first Summer Olympic Games under the IOC presidency of Juan Antonio Samaranch.

In response to the American-led boycott of the 1980 Summer Olympics in Moscow, 14 Eastern Bloc countries, including the Soviet Union, Cuba and East Germany, boycotted the Games; only Romania elected to attend. For differing reasons, Iran and Libya also boycotted. Although this boycott depleted the field in certain sports, 140 National Olympic Committees took part, which was a record at the time. Elite athletes from the U.S. and USSR would not directly compete again until the 1988 Summer Olympics in Seoul.

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