Kyrgyzstan competed at the 2004 Summer Olympics in Athens, Greece, from 13 to 29 August 2004. This was the nation's third appearance at the Olympics in the post-Soviet era.
Great Britain, represented by the British Olympic Association (BOA), competed at the 1952 Summer Olympics in Helsinki, Finland. 257 competitors, 213 men and 44 women, took part in 127 events in 18 sports. In 1952, they achieved their only gold medal during the last event of the last day of competition in Helsinki. Along with 1904 and 1996, this is Great Britain's lowest gold medal count.
Australia was the host nation for the 1956 Summer Olympics in Melbourne, Australia. However, due to Australian quarantine restrictions the equestrian events were held in Stockholm, Sweden. 294 competitors, 250 men and 44 women, took part in 140 events in 18 sports.
France competed at the 1952 Summer Olympics in Helsinki, Finland. 245 competitors, 214 men and 31 women, took part in 131 events in 18 sports.
The United States competed at the 1952 Summer Olympics in Helsinki, Finland. 286 competitors – 245 men and 41 women – took part in 133 events in 18 sports. They won 76 medals, including 6 podium sweeps; the highest number of medal sweeps in a single Olympiad by one country since World War II and still a record.
The Soviet Union (USSR) competed in the Olympic Games for the first time at the 1952 Summer Olympics in Helsinki, Finland. 295 competitors, 255 men and 40 women, took part in 141 events in 18 sports.
Colombia competed at the 2008 Summer Olympics. The country sent 68 athletes to compete in 15 sports, making this Colombia's largest ever delegation to the Olympics.
Romania competed in the 2008 Summer Olympics, held in Beijing, China from August 8 to August 24, 2008. Romania intended to send 104 competitors to Beijing, although the delegation was reduced to 102 when two Romanian athletes were suspended for doping before the start of the Olympics. The Romanian delegation for Beijing was the smallest Romanian Olympic delegation since the 1989 Revolution. Romanians competed in 16 sports: athletics, archery, handball, gymnastics, wrestling, swimming, diving, weightlifting, fencing, table tennis, shooting, tennis, judo, boxing, kayak-canoeing, and rowing.
Iran competed at the 2012 Summer Olympics in London, from 27 July to 12 August 2012. The nation has competed at every Summer Olympic games since its return in 1948, after having made their debut in 1900, with the exception of the 1980 and 1984 Summer Olympics. The National Olympic Committee of the Islamic Republic of Iran sent the nation's second-largest delegation to the Games, one less than it sent to Beijing. A total of 53 athletes, 45 men and 8 women, competed in 14 sports. This was also the youngest delegation in Iran's Olympic history, with half the team under the age of 25, and many of them are expected to reach their peak in time for the 2016 Summer Olympics in Rio de Janeiro. Heavyweight boxer Ali Mazaheri was the nation's flag bearer at the opening ceremony.
Bulgaria competed at the 2012 Summer Olympics in London, United Kingdom from 27 July to 12 August 2012. It was the nation's nineteenth appearance at the Summer Olympics, having missed the Olympics on three occasions, including the 1948 Summer Olympics in London due to the nation's role in World War II and 1984 Summer Olympics in Los Angeles because of the Soviet boycott. Despite this being London's third Olympic Games, this was the first time a Bulgarian team appeared at a London Olympics. The Bulgarian Olympic Committee sent the nation's smallest delegation to the Games, tying the record with Helsinki in 1952, and with Tokyo in 1964. A total of 63 athletes, 36 men and 27 women, competed in 16 sports. Men's volleyball was the only team event in which Bulgaria was represented in these Olympic games. There was only a single competitor in badminton, sprint canoeing, fencing, and judo.
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.
Ecuador competed at the 2012 Summer Olympics in London, from 27 July to 12 August 2012. This was the nation's twelfth consecutive appearance at the Olympics. It had first competed at the 1924 Summer Olympics in Paris.
Bahrain competed at the 2016 Summer Olympics in Rio de Janeiro, Brazil, from 5 to 21 August 2016. This nation marked its ninth consecutive appearance at the Summer Olympics.
Switzerland 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. Swiss athletes have appeared in every edition of the Summer Olympic Games in the modern era, except for a partial boycott of the 1956 Summer Olympics in Melbourne in protest at the Soviet invasion of Hungary.
Lithuania 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 eighth consecutive appearance at the Games in the post-Soviet era and tenth overall in Summer Olympic history.
Belarus 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 seventh consecutive appearance at the Summer Olympics in the post-Soviet era.
Guinea competed at the 2019 African Games held from 19 to 31 August 2019 in Rabat, Morocco. In total, two bronze medals were won and the country finished in 38th place in the medal table, shared with Benin and Togo.
Namibia competed at the 2019 African Games held from 19 to 31 August 2019 in Rabat, Morocco. Early on 56 athletes were scheduled to represent Namibia in 10 sports. This later grew to 68 athletes in 13 sports. In total two gold medals, two silver medals and four bronze medals were won and the country finished in 16th place in the medal table, shared with Angola. Most medals were won in cycling.
Sierra Leone competed at the 2019 African Games held from 19 to 31 August 2019 in Rabat, Morocco.
Nigeria competed at the 2024 Summer Olympics in Paris from 26 July to 11 August 2024. Since the nation made its debut in Helsinki 1952, Nigerian athletes have appeared in every edition of the Summer Olympic Games, except for Montreal 1976 as part of the Congolese-led boycott.
Australasia (1908–1912)
