Mexico competed at the 2004 Summer Olympics in Athens, Greece, from 13 to 29 August 2004. This was the nation's twentieth appearance at the Olympics, since its debut in 1900. Comité Olímpico Mexicano sent the nation's largest delegation to the Games since 1992. A total of 109 athletes, 59 men and 50 women, competed in 20 sports. Football was the only team-based sport in which Mexico had its representation in these Olympic Games. There was only a single competitor in fencing, shooting, and weightlifting.
Tunisia competed at the 2004 Summer Olympics in Athens, Greece, from 13 to 29 August 2004. This was the nation's eleventh appearance at the Olympics, except the 1980 Summer Olympics in Moscow because of its partial support to the United States boycott.
Belarus competed at the 2012 Summer Olympics in London, United Kingdom, from 27 July to 12 August 2012. This was the nation's fifth appearance at the Summer Olympics in the post-Soviet era. The Belarus Olympic Committee sent a total of 166 athletes to the Games, 90 men and 76 women, to compete in 20 sports.
France competed at the 2012 Summer Olympics in London, between 27 July and 12 August 2012. French athletes have competed in every Summer Olympic Games of the modern era. The French Olympic Committee sent a total of 330 athletes to the Games, 183 men and 147 women, to compete in 24 sports.
Japan, represented by Japanese Olympic Committee, competed at the 2012 Summer Olympics in London, from 27 July to 12 August 2012. Despite being London's third Olympic Games, Japan marked their London debut at this games. The nation also celebrated its centennial anniversary in the Olympics, having participated at every games since 1912 except for two editions; it was not invited to the 1948 Summer Olympics in London for its role in World War II, and was also part of the US-led boycott of the 1980 Summer Olympics in Moscow. Japan sent a total of 295 athletes to the Games, 138 men and 157 women, to compete in 24 sports.
Brazil competed at the 2012 Summer Olympics in London, from 27 July to 12 August 2012. This was the nation's twenty-first appearance at the Summer Olympics, having missed the 1928 Summer Olympics in Amsterdam. The Brazilian Olympic Committee sent a total of 258 athletes to the Games, 136 men and 122 women, to compete in 24 sports. Brazil left London with a total of 17 Olympic medals, winning their third largest number of medals at a single games.
Uruguay competed at the 2012 Summer Olympics in London, from 27 July to 12 August 2012. This was the nation's twentieth appearance at the Olympics, Uruguay missed the 1980 Summer Olympics in Moscow, because of its partial support for the United States boycott.
Mexico competed at the 2012 Summer Olympics in London, from 27 July to 12 August 2012. This was the nation's twenty-second appearance at the Olympics since its debut in 1900. Comité Olímpico Mexicano sent a total of 102 athletes to the Games, 64 men and 38 women, to compete in 23 sports. Men's football was the only team sport in which Mexico was represented at these Olympic Games. There was only a single competitor in badminton, sprint canoeing, and table tennis.
South Korea competed at the 2012 Summer Olympics in London, from July 27 to August 12, 2012. This was the nation's sixteenth appearance at the Olympics, having missed the 1980 Summer Olympics in Moscow because of its support for the United States boycott. The Korean Olympic Committee sent the nation's smallest delegation to the Games since 1992. A total of 248 athletes, 135 men and 113 women, competed in 22 sports.
North Korea competed at the 2012 Summer Olympics in London, from 27 July to 12 August 2012. This was the nation's ninth appearance at the Olympics since its debut in 1972. North Korean athletes did not attend the 1984 Summer Olympics in Los Angeles, when they joined the Soviet boycott, and subsequently, led a boycott at the 1988 Summer Olympics in Seoul, along with six other nations.
Colombia competed at the 2012 Summer Olympics in London, from 27 July to 12 August 2012. This was the nation's eighteenth appearance at the Olympics, having not competed at the 1952 Summer Olympics in Helsinki.
Switzerland competed at the 2012 Summer Olympics in London, from 27 July to 12 August 2012. Swiss athletes have competed at every Summer Olympic Games in the modern era, except when they boycotted the 1956 Summer Olympics in Melbourne in protest of the Soviet invasion of Hungary. The Swiss Olympic Association sent a total of 103 athletes to the 2012 Games, 72 men and 31 women, to compete in 18 sports.
Morocco competed at the 2012 Summer Olympics in London, from 27 July to 12 August 2012. It was the nation's thirteenth appearance at the Olympics, having not participated at the 1980 Summer Olympics in Moscow because of its support of the United States boycott.
Puerto Rico competed at the 2012 Summer Olympics in London, United Kingdom from July 27 to August 12, 2012. This was the nation's seventeenth consecutive appearance at the Olympics.
Gabon competed at the 2012 Summer Olympics in London, from 27 July to 12 August 2012. This was the nation's ninth appearance at the Olympics; the nation did not participate at the 1976 Summer Olympics in Montreal and 1980 Summer Olympics in Moscow, affected by the African and the American-led boycott, respectively.
Cameroon competed at the 2012 Summer Olympics in London, United Kingdom, from 27 July to 12 August 2012. This was the nation's thirteenth appearance at the Olympics.
Venezuela competed at the 2012 Summer Olympics in London, from July 27 to August 12, 2012. This was the nation's seventeenth consecutive appearance at the Olympics, since its debut at the same host city in 1948. Celebrating the anniversary of the nation's Olympic debut, the British Embassy in Caracas invited former track cyclist Julio César León to travel back to the United Kingdom, and revisit his memories as the first Venezuelan athlete in history to compete at the games.
Honduras competed at the 2012 Summer Olympics in London, United Kingdom, from 27 July to 12 August 2012. This was the nation's tenth appearance at the Olympics, excluding the 1972 Summer Olympics in Munich, and the 1980 Summer Olympics in Moscow, because of the American-led boycott.
Senegal competed at the 2016 Summer Olympics in Rio de Janeiro, from August 5 to 21, 2016. It was the nation's fourteenth consecutive appearance at the Summer Olympics since its debut in 1964.
Zambia 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 fourteenth appearance at the Summer Olympics, although it marked its official debut in 1964 under the name Northern Rhodesia.
