The 1984 Summer Olympics, officially known as the Games of the XXIII Olympiad, was an international multi-sport event that was held from July 28 to August 12, 1984, in Los Angeles, United States. This was the second time that Los Angeles had hosted the Games, the first being in 1932.

California was the home state of the incumbent U.S. President Ronald Reagan, who officially opened the Games. The logo for the 1984 Games, branded "Stars in Motion", featured red, white and blue stars arranged horizontally and struck through with alternating streaks. The official mascot of the Games was Sam the Olympic Eagle. These were the first Summer Olympic Games under the IOC presidency of Juan Antonio Samaranch.

The 1984 Games were boycotted by a total of fourteen Eastern Bloc countries, including the Soviet Union and East Germany, in response to the American-led boycott of the previous 1980 Summer Olympics in Moscow in protest of the Soviet invasion of Afghanistan; Romania was the only Eastern Bloc nation that opted to attend the Games. Iran and Libya also chose to boycott the Games for unrelated reasons. Despite the field being depleted in certain sports due to the boycott, 140 National Olympic Committees took part, which was a record at the time.^[2][3]

The 1984 Summer Olympics are widely considered to be the most financially successful modern Olympics^[4] and served as an example of how to run the model Olympic Games. As a result of low construction costs, coupled with a reliance on private corporate funding,^[5] the 1984 Olympic Games generated a profit of more than $250 million.

On July 18, 2009, a 25th anniversary celebration was held in the main Olympic Stadium. The celebration included a speech by the former president of the Los Angeles Olympic Organizing Committee, Peter Ueberroth, and a re-creation of the lighting of the cauldron. Los Angeles will host the Summer Olympics for the third time in 2028.

After the murder of Israeli athletes by Palestinian terrorists in Munich (1972), the significant financial debts of Montreal (1976), and boycotts, few cities by the late 1970s were willing to bid for the Summer Olympics. Only two cities (Tehran and Los Angeles) made serious bids for the 1984 Summer Games, but before the final selection of a "winning" city in 1978, the bid from Tehran was withdrawn as a result of Iran's policy changes following the Iranian Revolution and a change in the country's ruling system. Hence, the selection process for the 1984 Summer Olympics consisted of a single finalized bid from Los Angeles, which the International Olympic Committee (IOC) accepted. The selection was officially made at the 80th IOC Session in Athens on 18 May 1978.^[6]

Los Angeles had unsuccessfully bid for the two previous Summer Olympics, for 1976 and 1980. The United States Olympic Committee (USOC) had submitted at least one bid for every Olympics since 1944, but had not succeeded since the Los Angeles Olympics in 1932, the previous time only a single bid had been issued for the Summer Olympics.

The 1984 Olympic Torch Relay began in New York City and ended in Los Angeles, traversing 33 states and the District of Columbia. Unlike later torch relays, the torch was continuously carried by runners on foot. The route covered more than 9,320 mi (15,000 km) and involved 3,636 runners. Noted athlete O.J. Simpson was among the runners, carrying the torch up the California Incline in Santa Monica. Gina Hemphill, granddaughter of Jesse Owens, carried the torch into the Coliseum, completed a lap around the track, then handed it off to the final runner, Rafer Johnson, winner of the decathlon at the 1960 Summer Olympics. With the torch, he touched off the flame which passed through a specially designed flammable Olympic logo, igniting all five rings. The flame then passed up to cauldron atop the peristyle and remained aflame for the duration of the Games.

John Williams composed the theme for the Olympiad, "Olympic Fanfare and Theme". This piece won a Grammy for Williams and became one of the most well-known musical themes of the Olympic Games, along with Leo Arnaud's "Bugler's Dream"; the latter is sometimes attached to the beginning of Olympic Fanfare and Theme. Composer Bill Conti also wrote a song to inspire the weightlifters called "Power". An album, The Official Music of the XXIII Olympiad—Los Angeles 1984, featured three of those tracks along with sports themes written for the occasion by popular musical artists including Foreigner, Toto, Loverboy, Herbie Hancock, Quincy Jones, Christopher Cross, Philip Glass and Giorgio Moroder.^[7]

The Brazilian composer Sérgio Mendes also produced a special song for the 1984 Olympic Games, "Olympia," from his 1984 album Confetti. A choir of approximately one thousand voices was assembled of singers in the region. All were volunteers from nearby churches, schools and universities.

Etta James performed "When the Saints Go Marching In" at the Opening Ceremony.^[8]

Vicki McClure along with the International Children's Choir of Long Beach sang "Reach Out and Touch".

Lionel Richie performed a 9-minute version of his hit single "All Night Long" at the closing ceremonies.^[9]

The 1984 Summer Olympics was preceded by the 10-week-long adjunct Los Angeles Olympic Arts Festival, which opened on June 2 and ended on August 12. It provided more than 400 performances by 146 theater, dance and music companies, representing every continent and 18 countries. It was organized by then-CalArts President Robert Fitzpatrick.

The Los Angeles Olympic Organizing Committee named Ernie Barnes "Sports Artist of the 1984 Olympic Games". LAOOC President Peter V. Ueberroth said Barnes and his art "captured the essence of the Olympics" and "portray the city's ethnic diversity, the power and emotion of sports competition, the singleness of purpose and hopes that go into the making of athletes the world over." Barnes was commissioned to create five Olympic-themed paintings and serve as an official Olympic spokesman to encourage inner city youth.[

The Oxford Olympics Study established the outturn cost of the Los Angeles 1984 Summer Olympics at US$719 million in 2015-dollars.^[13] This includes sports-related costs only, that is, (i) operational costs incurred by the organizing committee for the purpose of staging the Games, e.g., expenditures for technology, transportation, workforce, administration, security, catering, ceremonies, and medical services, and (ii) direct capital costs incurred by the host city and country or private investors to build, e.g., the competition venues, the Olympic village, international broadcast center, and media and press center, which are required to host the Games. Indirect capital costs are not included, such as for road, rail, or airport infrastructure, or for hotel upgrades or other business investment incurred in preparation for the Games but not directly related to staging the Games. The cost for Los Angeles 1984 compares with costs of US$4.6 billion for Rio 2016, US$40-44 billion for Beijing 2008 and US$51 billion for Sochi 2014, the most expensive Olympics in history. Average cost for the Summer Games since 1960 is US$5.2 billion.

The 1984 Summer Olympic program featured 221 events in the following 21 sports:

These are the top ten nations that won medals at the 1984 Games.

Athletes from 140 nations competed at the 1984 Summer Olympics. Eighteen nations made their Olympic debut: Bahrain, Bangladesh, Bhutan, British Virgin Islands, Djibouti, Equatorial Guinea, Gambia, Grenada, Mauritania, Mauritius, North Yemen, Oman, Qatar, Rwanda, Samoa, Solomon Islands, Tonga, and the United Arab Emirates. Zaire had previously competed at the 1968 Summer Olympics as Congo-Kinshasa. The People's Republic of China made its first appearance in a Summer Olympics since 1952, while for the first time the Republic of China team participated under the politically contrived name of Chinese Taipei.

The Soviet Union led the Warsaw Pact members and other Communist countries in a boycott of the Los Angeles Olympics, in retaliation for the U.S.-led boycott of the Moscow Olympics four years earlier (over the Soviet Union's invasion of Afghanistan in 1979). The pretexts for the 1984 Soviet-led boycott were concerns over security, "chauvinistic sentiments" and "an anti-Soviet hysteria ... being whipped up" in the United States.^[14] However, a handful of countries disregarded the boycott and attended the Games anyway, among them Yugoslavia (host of the 1984 Winter Olympics), the People's Republic of China, and Romania (the only Warsaw Pact country that had opted to ignore the Soviet demands). The Romanian team received a particularly warm reception from the United States; when the Romanian athletes entered during the opening ceremonies, they were greeted by a standing ovation from the spectators, who were mostly U.S. citizens. This would turn out to be Romania's most successful Olympic Games – they won 53 medals, including 20 golds.

In the table below, the number of athletes representing each nation is shown in parentheses.

Fourteen countries took part in the Soviet-led boycott of the 1984 Summer Olympics:^[15]

Albania, Iran and Libya also boycotted the Los Angeles Olympics, citing political reasons, but these countries were not a part of the Soviet-led boycott. Albania and Iran were the only two countries to boycott both the 1980 and 1984 Summer Games.

Documents obtained in 2016 revealed the Soviet Union's plans for a statewide doping system in track and field in preparation for the 1984 Summer Olympics in Los Angeles. Dated prior to the country's decision to boycott the Games, the document detailed the existing steroids operations of the program, along with suggestions for further enhancements. The communication, directed to the Soviet Union's head of track and field, was prepared by Dr. Sergei Portugalov of the Institute for Physical Culture. Portugalov was also one of the main figures involved in the implementation of the Russian doping program prior to the 2016 Summer Olympics.^[12] Filmmaker and director of 2017 movie Icarus Bryan Fogel has said that stricter doping controls might have been the main reason of the Soviet boycott.^[16]

Following the news of the massive financial losses of the 1976 Summer Olympics in Montreal, the only two cities to express a genuine interest in hosting the 1984 Games were Los Angeles and New York. Given that only one city per country is allowed to bid for any one Games, the USOC vote for the American bid city was effectively the deciding vote for the 1984 Olympics host city. In this case, the Los Angeles bid received 55 votes compared with New York's 39 votes – this is the closest that the city of New York has ever come to being selected to host the Olympic Games, coming closer in 1984 than they did in their 2012 bid (when they lost to London).^[17]

The low level of interest among potential host cities for the 1984 Games had been viewed as a major threat to the future of the Olympic Games. However, after the financial success of the Los Angeles Games, cities began to show a renewed interest in bidding to become host again. The Los Angeles and Montreal Games are seen as examples of best and worst practice when organizing the Olympics, and serve as valuable lessons to prospective host cities.

Ambitious construction projects for the two previous Summer Olympics, Montreal 1976 and Moscow 1980, had burdened organizers with substantial debts as expenses greatly exceeded revenues. Furthermore, the 1976 and 1980 Olympics were entirely government funded. Unlike Montreal and Moscow, Los Angeles 1984 was privately funded, with strict controls imposed on expenditure; rather than constructing new venues with overly ambitious designs, the organizers chose instead to utilise existing venues and facilities wherever possible. The main example of this was the Los Angeles Memorial Coliseum, which was also the Olympic Stadium for the 1932 Summer Olympics.^[18] The only two new venues constructed specifically for the 1984 Summer Olympics were secured with the backing of corporate sponsors: the Olympic Velodrome was largely funded by the 7-Eleven corporation and the Olympic Swim Stadium by McDonald's.

In addition to corporate support, the Olympic committee also used the income from the exclusive television rights, and for the first time these contracts would prove to be a significant source of revenue. Adjusted for inflation, the Los Angeles Games secured twice the amount of income received by the 1980 Moscow Summer Olympics and four times that of the 1976 Montreal Summer Olympics.^[19][17]

Following the success of the 1984 Games, the Los Angeles OCOG, led by Peter Ueberroth, used the profits to create the LA84 Foundation for promoting youth sports in Southern California, educating coaches and maintaining a sports library.

The games were the topic of the 1983–84 United States commemorative coin series.

McDonald's ran a promotion titled, "When the U.S. Wins, You Win" where customers scratched off a ticket with the name of an Olympic event on it, and if the U.S. won a medal in that event then they would be given a free menu item: a Big Mac for a gold medal, an order of french fries for a silver medal, and a Coca-Cola for a bronze medal. The promotion became more popular than expected due to the Soviet boycott which led to the U.S. winning far more Olympic medals than expected.^[20]

This promotion was parodied in The Simpsons episode "Lisa's First Word", where Krusty Burger runs a similar offer. The promotion was intended to be rigged so that prizes would only be offered in events dominated by the Eastern Bloc, but the Soviet-led boycott causes Krusty to personally lose $44 million. He vehemently promises "to spit in every fiftieth burger," to which Homer retorts "I like those odds!" Chief Wiggum also exclaims that he could kiss Carl Lewis, who won four gold medals at the Games.

On NCIS, Tim McGee has an obsession with jet packs, stemming from having attended the 1984 Olympic ceremony as a child and having Bill Suitor fly over his head in his jet pack.^[21] This storyline is based on the real experience of executive producer and writer Jesse Stern.^[22]

Pop punk band Bowling for Soup references the games in the song "I Can't Stand LA". During a section showing appreciation for the city, the song states, "thank you for hair metal and the '84 Olympics."

Jilly Cooper's novel Riders has a storyline set at the show jumping event at the 1984 Summer Olympics.

In the Seinfeld episode "The Gymnast", Jerry dates a woman who competed in the 1984 Olympics and won a silver medal for Romania.

The 1984 Games were covered by the following broadcasters: