The 1984 Summer Olympics (officially the Games of the XXIII Olympiad and commonly known as Los Angeles 1984) were an international multi-sport event held from July 28 to August 12, 1984, in Los Angeles, California, United States. It marked the second time that Los Angeles had hosted the Games, the first being in 1932. This was the first of two consecutive Olympic Games to be held in North America, with Calgary, Alberta, Canada, hosting the 1988 Winter Olympics. California was the home state of the incumbent U.S. president Ronald Reagan, who officially opened the Games. These were the first Summer Olympic Games under the IOC presidency of Juan Antonio Samaranch.
The 1984 Games were boycotted by fourteen Eastern Bloc countries, including the Soviet Union and East Germany, in response to the American-led boycott of the 1980 Summer Olympics in Moscow, Soviet Union, in protest of the Soviet invasion of Afghanistan; Romania was the only Soviet-aligned state that opted to attend the Games. Albania, Iran, Libya and Upper Volta also chose to boycott the Games, but for unrelated reasons.