Argentina competed at the 2020 Summer Olympics in Tokyo. Originally scheduled to take place from 24 July to 9 August 2020, the Games were postponed to 23 July to 8 August 2021, because of the COVID-19 pandemic. Since the nation's official debut in 1900, Argentine athletes have competed in every edition of the Summer Olympic Games, except the 1904 Summer Olympics in St. Louis, the 1912 Summer Olympics in Stockholm, and the 1980 Summer Olympics in Moscow because of their support for the United States-led boycott.
Poland competed at the 2020 Summer Olympics in Tokyo. Originally scheduled to take place from 24 July to 9 August 2020, the Games were postponed to 23 July to 8 August 2021, because of the COVID-19 pandemic. Since the nation's official debut in 1924, Polish athletes have appeared in every edition of the Summer Olympic Games, with the exception of the 1984 Summer Olympics in Los Angeles, because of the Soviet boycott.
Turkey competed at the 2020 Summer Olympics in Tokyo. Originally scheduled to take place from 24 July to 9 August 2020, the Games were postponed to 23 July to 8 August 2021, due to the COVID-19 pandemic. Since the nation's official debut in 1908, Turkish athletes have appeared in every edition of the Summer Olympic Games, except the 1920 Summer Olympics in Antwerp, the 1932 Summer Olympics in Los Angeles at the period of worldwide Great Depression, and the 1980 Summer Olympics in Moscow because of its support for the United States-led boycott.
The People's Republic of China competed at the 2020 Summer Olympics in Tokyo, Japan. Originally scheduled to take place from 24 July to 9 August 2020, the Games were postponed to 23 July to 8 August 2021 because of the COVID-19 pandemic. It was the nation's eleventh appearance at the Summer Olympics since its debut in 1952. The opening ceremony flag-bearers for China were volleyball player Zhu Ting and taekwondo practitioner Zhao Shuai. Sprinter Su Bingtian, who broke the Asian record of 100 m during the Games, was the flag-bearer for the closing ceremony. The delegation competed in all sports except baseball (softball), handball, and surfing.
Australia competed at the 2020 Summer Olympics in Tokyo. Originally scheduled to take place from 24 July to 9 August 2020, the Games were postponed to 23 July to 8 August 2021, because of the COVID-19 pandemic. Australia is one of only five countries to have sent athletes to every Summer Olympics of the modern era, alongside Great Britain, France, Greece, and Switzerland.
Italy competed at the 2020 Summer Olympics in Tokyo. Originally scheduled to take place from 24 July to 9 August 2020, the Games were postponed to 23 July to 8 August 2021, because of the COVID-19 pandemic. Italian athletes have appeared in every Summer Olympics edition of the modern era, with the disputed exception of the 1904 Summer Olympics in St. Louis where one Italian may have participated.
Norway competed at the 2020 Summer Olympics in Tokyo. Originally scheduled to take place from 24 July to 9 August 2020, the Games were postponed to 23 July to 8 August 2021, because of the COVID-19 pandemic. Since the nation's debut in 1900, Norwegian athletes have appeared in every edition of the Summer Olympic Games, except for two occasions: the 1904 Summer Olympics in St. Louis and the 1980 Summer Olympics in Moscow, due to the country's support for the United States-led boycott.
France competed at the 2020 Summer Olympics in Tokyo. Originally scheduled to take place from 24 July to 9 August 2020, the Games were postponed to 23 July to 8 August 2021, because of the COVID-19 pandemic. French athletes have appeared in every Summer Olympic Games of the modern era, alongside Australia, Great Britain, Greece, and Switzerland. As Paris will host the 2024 Summer Olympics, France was the penultimate nation to enter the stadium, alongside the United States which will host the 2028 Summer Olympics in Los Angeles, before the host country Japan during the parade of nations at the opening ceremony. Additionally, a French segment was performed in Paris and some pre-recorded events at the closing ceremony as performers did not travel to Tokyo due to the travel restrictions related to the pandemic. However, Paris mayor Anne Hidalgo was the only delegation present at the ceremony.
The United States of America (USA), represented by the United States Olympic & Paralympic Committee (USOPC), competed at the 2020 Summer Olympics in Tokyo. Originally scheduled to take place in the summer of 2020, the Games were postponed to July 23 to August 8, 2021, due to the COVID-19 pandemic. U.S. athletes have appeared in every Summer Olympic Games of the modern era, with the exception of the 1980 Summer Olympics in Moscow, which the U.S. boycotted in protest of the Soviet invasion of Afghanistan. The opening ceremony flag-bearers for the United States were baseball player Eddy Alvarez and basketball player Sue Bird. Javelin thrower Kara Winger was the flag-bearer for the closing ceremony. For the third consecutive time in the Summer Olympics, the United States was represented by more female than male athletes (285 men and 330 women).
Uzbekistan competed at the 2020 Summer Olympics in Tokyo. Originally scheduled to take place from 24 July to 9 August 2020, the Games were postponed to 23 July to 8 August 2021, due to the COVID-19 pandemic. It was the nation's seventh consecutive appearance at the Summer Olympics in the post-Soviet era.
Serbia competed at the 2020 Summer Olympics in Tokyo. Originally scheduled to take place from 24 July to 9 August 2020, the Games were postponed to 23 July to 8 August 2021, due to the COVID-19 pandemic. It was the nation's fifth appearance at the Summer Olympics as an independent nation.
The team of the Olympic Federation of Ireland, which competed at the 2020 Summer Olympics in Tokyo, represented athletes from both the Republic of Ireland and those from Northern Ireland who choose it instead of the Great Britain and Northern Ireland team. Originally scheduled to take place from 24 July to 9 August 2020, the Games were postponed to 23 July to 8 August 2021, due to the COVID-19 pandemic. It was the team's twenty-second appearance at the Summer Olympics, having attended every edition since 1924 except the 1936 Summer Olympics in Germany.
Cuba competed at the 2020 Summer Olympics in Tokyo. Originally scheduled to take place from 24 July to 9 August 2020, the Games were postponed to 23 July to 8 August 2021, because of the COVID-19 pandemic. The Cuban delegation was their smallest since 1964, which coincidentally was also in Tokyo. It was the nation's twenty-first appearance at the Summer Olympics. Cuba improved on its 2016 result, by winning 7 gold and 15 total medals after 5 and 11 in Rio.
Egypt competed at the 2020 Summer Olympics in Tokyo. Originally scheduled to take place during the summer of 2020, the Games were postponed to 23 July to 8 August 2021, because of the COVID-19 pandemic. Since the nation's debut in 1912, Egyptian athletes have appeared in every edition of the Summer Olympic Games except 1932 and 1980, joining the United States-led boycott in the latter.
Iran competed at the 2020 Summer Olympics in Tokyo. Originally scheduled to take place during the summer of 2020, the Games were postponed to 23 July to 8 August 2021, because of the COVID-19 pandemic. Since the nation's return in 1948 after having made their debut in 1900, Iranian athletes have attended every edition of the Summer Olympic Games, with the exception of 1980 and 1984 which they boycotted.
Ivory Coast, also known as Côte d'Ivoire and officially as the Republic of Côte d'Ivoire, competed at the 2020 Summer Olympics in Tokyo. Originally scheduled to take place from 24 July to 9 August 2020, the Games were postponed to 23 July to 8 August 2021, because of the COVID-19 pandemic. It was the nation's fourteenth appearance at the Summer Olympics.
The Dominican Republic competed at the 2020 Summer Olympics in Tokyo. Originally scheduled to take place from 24 July to 9 August 2020, the Games were postponed to 23 July to 8 August 2021, because of the COVID-19 pandemic. It was the nation's fifteenth consecutive appearance at the Summer Olympics. The Dominican Republic left the Summer Olympics with 3 silver medals and 2 bronze medals with moderate success, but not able to secure a single gold medal in any of the events.
Tunisia competed at the 2020 Summer Olympics in Tokyo. Originally scheduled to take place from 24 July to 9 August 2020, the Games were postponed to 23 July to 8 August 2021, due to the COVID-19 pandemic. Since the nation's official debut in 1960, Tunisian athletes have appeared in every edition of the Summer Olympic Games, except the 1980 Summer Olympics in Moscow because of the nation's partial support for the US-led boycott.
Nigeria competed at the 2020 Summer Olympics in Tokyo. Originally scheduled to take place from 24 July to 9 August 2020, the Games were postponed to 23 July to 8 August 2021, because of the COVID-19 pandemic. Since the nation made its debut in 1952, Nigerian athletes have appeared in every edition of the Summer Olympic Games, with the exception of the 1976 Summer Olympics in Montreal because of the African boycott.
Morocco competed at the 2020 Summer Olympics in Tokyo. Originally scheduled to take place during the summer of 2020, the Games were postponed to 23 July to 8 August 2021, because of the COVID-19 pandemic. The 2020 Games were the nation's fifteenth appearance at the Summer Olympics.
