List of participating nations at the Summer Olympic Games

This is a list of nations, as represented by National Olympic Committees (NOCs), that have participated in the Summer Olympic Games between 1896 and 2024. As of the 2024 Games, all of the current 206 NOCs have participated in at least two editions of the Olympic Games. Athletes from Australia, France, Great Britain, Greece, Italy, and Switzerland have competed in all thirty Summer Olympic Games.
Early Games were not clearly documented with respect to participating nations. Competitors from 11 to 16 nation participated in the inaugural 1896 Games, in Athens. Eleven nations (Australia, Austria, Denmark, Great Britain, France, Germany, Greece, Hungary, Sweden, Switzerland, and the United States) are mentioned in the official report for the Games, and the International Olympic Committee (IOC) states that 14 nations were represented. The NOCs for Bulgaria and Chile each claim that they were represented by a single athlete in Athens. Other sources also list Egypt, Italy, and the Turkish Empire.
While official report was actually the summary of the sporting events held at the 1900 Exposition Universelle and so can not be considered as reliable source, the IOC states that 24 nations participated in the 1900 Summer Olympics in Paris, but additional sources list up to 28 nations, with Haiti, Iran, Luxembourg, and Peru being the additions. The 1904 Games, held in St. Louis were the first Olympics outside of Europe, with very few top-class athletes from outside the North America taking part, and saw the participation of 12 to 15 nations, including a not yet existing Union of South Africa represented by a Boer team of extras from the Louisiana Purchase Exposition. Although the Intercalated Games of 1906 are no longer considered official Games of the Olympiad by the IOC, they helped restore the Olympic movement. Participation at subsequent Games grew steadily, with 22 nations in London for 1908 and 28 nations in Stockholm for the 1912 Games. At these two Games (only), one of the delegations was actually a combined team of athletes from Australia and New Zealand, designated Australasia. The Games of 1916, planned for Berlin, were cancelled due to World War I.
After the First World War, the Olympic Games resumed in 1920, in Antwerp. Twenty-nine nations participated, but not Austria, Bulgaria, Germany, Hungary, or Turkey, none of which were invited because of their roles in the war. Several newly created European states, such as Czechoslovakia and Yugoslavia, made their Olympic debut.
The Games grew rapidly for the 1924 Summer Olympics, in Paris, with 44 nations present, even though Germany was still not invited back to the Games. This situation would change for the 1928 Games where Germany returned to join a total of 46 participating nations. Competitors from 37 nations travelled to Los Angeles for the 1932 Summer Olympics. The 1936 Summer Olympics, in Berlin, were attended by 49 nations (a new high) but were highly politicized. The scheduled Games of 1940 in Tokyo or Helsinki and 1944 in London were each cancelled due to the outbreak of World War II in 1939.
Twelve years after the previous Games, the 1948 Summer Olympics, in London, attracted competitors from 59 nations, including 14 that made their Olympic debut; once again, Germany was not invited to take part, and neither was Japan. The 1952 Games, in Helsinki, again set a new high, with 69 nations participating, including the first appearance by the Soviet Union and People's Republic of China and the return of Germany and Japan. The 1956 Summer Olympics, attended by 67 nations in Melbourne, were the first to be marred by a boycott. Egypt, Iraq, and Lebanon withdrew in response to the Suez Crisis, and the Netherlands, Spain, and Switzerland withdrew in response to the Soviet invasion of Hungary. Because of Australian quarantine restrictions, the equestrian events were held five months earlier in Stockholm, with a total of 29 participating nations, including five nations that did not compete in Melbourne.
Participation by African and Latin American nations increased significantly during the 1960s. A total of 84 nations were represented at the 1960 Summer Olympics, in Rome, 94 nations at the 1964 Games, in Tokyo, and 112 nations at the 1968 Summer Olympics, in Mexico City. The 1968 Games also marked the first time that West Germany and East Germany competed as independent teams. For the previous three Olympiads (1956–1964), the two NOCs were jointly represented by a united German team. The 1972 Summer Olympics, in Munich, featured 121 nations, the highest total yet.
The next three Games were each marred by significant boycotts. At the 1976 Summer Olympics, in Montreal, only 92 nations were represented. Twenty-nine African nations (Ivory Coast and Senegal being the only two exceptions) boycotted the Games because of New Zealand's participation, as New Zealand maintained other sporting relations with apartheid South Africa. The largest Olympic boycott took place at the 1980 Games, in Moscow, when only 80 nations participated. The United States led the boycott in protest of the December 1979 Soviet invasion of Afghanistan, and were joined by more than 60 other nations. In response, the 1984 Summer Olympics, in Los Angeles, were boycotted by the Soviet Union and their allies, yet a total of 140 nations did participate. The 1988 Games, in Seoul, marked a new high, with 160 participating nations.
Several events in the 1990s led to a large increase in participating nations at the Olympic Games. After the dissolution of the Soviet Union, the Baltic states competed as independent nations for the first time since 1936 at the 1992 Games, in Barcelona. The remaining twelve ex-republics of the Soviet Union competed together as the Unified Team for these Games. A single German team competed for the first time since 1964, after the German reunification in 1990, while the breakup of Yugoslavia resulted in the Olympic debut of new nations.
The Centennial Olympics, in Atlanta, were attended by athletes from 197 nations, including 24 nations making their Summer Games debut. Czechoslovakia had split into the Czech Republic and Slovakia, and all ex-Soviet republics competed as independent nations. The Games continued to grow, with 199 nations represented in Sydney, for the 2000 Summer Games, and 201 nations in Athens, for the 2004 Summer Olympics.
A record number of nations (204) were represented at the 2008 Summer Olympics in Beijing, with Marshall Islands and Tuvalu making their Olympic debut. After competing together as Serbia and Montenegro in 2004, Serbia and Montenegro sent independent teams to Beijing. Only Brunei failed to participate in the Games, after failing to register any athletes for competition. The 2012 Games in London increased this record to 206 nations, even though only 204 NOCs were represented. Brunei returned to the Games, but athletes from the former Netherlands Antilles competed as Independent Olympic Athletes, after the Netherlands Antilles Olympic Committee's membership in the IOC was withdrawn in 2011 as a consequence of the dissolution of the Caribbean country. One athlete from South Sudan also competed as an independent athlete, since the nation had not yet formed a National Olympic Committee after its independence in 2011.
A further increase occurred in the 2016 Summer Olympics, with 206 nations represented: South Sudanese athletes were able to compete under their nation's flag and Kosovo made their debut as an independent team. There was also a team made up of refugees, made up of athletes from the Democratic Republic of the Congo, Ethiopia, South Sudan and Syria who had fled their home countries and could not compete under their home NOC.
Despite the COVID-19 pandemic crisis, the 2020 Summer Olympics in 2021 also had 206 teams represented, with only North Korea boycotting. However, the Russian Olympic Committee was banned, and Russian athletes competed as independent athletes with no national flag and anthem, due to doping sanctions., On March 28, 2023, it was announced that Russian and Belarusian athletes compete as Individual Neutral Athletes and the abbreviation AIN, and North Korea returned to Paris 2024.
This list includes all 206 current NOCs, 21 obsolete NOCs and 3 other entries, arranged alphabetically. The three-letter country code is also listed for each NOC. Since the 1960s, these codes have been frequently used by the IOC and each Games organizing committee to identify NOCs, such as within the official report of each Games. However, in this section, several countries uses long-form names designated by the United Nations uses short form common names such as for example: Laos (Lao People's Democratic Republic), North Korea (Democratic People's Republic of Korea), and Moldova (Republic of Moldova).
Several nations have changed during their Olympic history. Name changes due to geographical renaming are explained by footnotes after the nation's name, and other notes are explained by footnotes linked within the table itself.
Obsolete nations are included in the table to more clearly illustrate past Olympic appearances for their successor nations.
^ ANT: Prior to Antigua and Barbuda's independence in 1981, The Associated State of Antigua participated as Antigua in 1976. ^ BIZ: Belize participated under its former name of British Honduras (HBR) in 1968 and 1972. ^ BEN: Benin was known as Dahomey (DAH) in 1972. ^ BUR: Burkina Faso was known as Upper Volta (VOL) in 1972. ^ TPE: The Chinese Taipei was designated Republic of China (ROC) in 1956 and 1972, Formosa (RCF) in 1960, and Taiwan in 1964 and 1968. In 1979, the IOC started to use Chinese Taipei to refer to this NOC, a compromise that was acceptable for the People's Republic of China to start participating in the Olympic Games. ^ COD: The Democratic Republic of the Congo was known as Zaire (ZAI) between 1984 and 1996. ^ CIV: Côte d'Ivoire was known as Ivory Coast between 1964 and 1988. ^ EGY: Egypt participated as the United Arab Republic between 1960 and 1968. ^ GHA: Prior to Ghana's independence in 1957, Gold Coast participated in the 1952 Games. ^ GUY: Prior to Guyana's independence in 1966, British Guiana participated from 1948 to 1964. ^ MYA: Myanmar was known as Burma (BIR) between 1948 and 1988. ^ MKD: North Macedonia was known as Macedonia, or more formally the Former Yugoslav Republic of Macedonia due to a naming dispute with Greece, between 1996 and 2016. ^ SAM: Samoa was known as Western Samoa between 1984 and 1996. ^ SCG: The Federal Republic of Yugoslavia, consisting of the Republic of Serbia and the Republic of Montenegro, participated at the Games since 1996. It was reconstituted as the State Union of Serbia and Montenegro in 2003. At the 1996 and 2000 Games, the nation was still designated Yugoslavia (YUG). The Serbia and Montenegro (SCG) designation and code were used at the 2004 Games. ^ SRI: Sri Lanka was known as Ceylon (CEY) between 1948 and 1972. ^ SWZ: Eswatini was known as Swaziland between 1972 and 2016. ^ TAN: Although Tanganyika and Zanzibar had already merged to form Tanzania in April 1964, the nation was designated Tanganyika in the official report of the 1964 Games. ^ ZAM: Zambia achieved independence on the last day of the 1964 Games, but had participated as Northern Rhodesia (NRH) during those Games. ^ ZIM: Prior to Zimbabwe's independence in 1980, Southern Rhodesia participated as Rhodesia (RHO) in 1928, 1960, and 1964.