Slovenia competed at the 2004 Summer Olympics in Athens, Greece, from 13 to 29 August 2004. This was the nation's fourth consecutive appearance at the Summer Olympics since the post-Yugoslav era. The Slovenian Olympic Committee sent the nation's largest ever delegation to the Games in Olympic history. A total of 79 athletes, 56 men and 23 women, competed in 10 sports. For the second consecutive time, men's handball was the only team-based sport in which Slovenia had its representation at these Games.
Singapore competed at the 2004 Summer Olympics in Athens, Greece, from 13 to 29 August 2004. This was the nation's thirteenth appearance at the Olympics, except for two different editions. Singapore was part of the Malaysian team at the 1964 Summer Olympics in Tokyo, but did not attend at the 1980 Summer Olympics in Moscow, because of its support for the United States boycott.
Colombia competed at the 2004 Summer Olympics in Athens, Greece, from 13 to 29 August 2004. This was the nation's sixteenth appearance at the Olympics, except the 1952 Summer Olympics in Helsinki.
Croatia competed at the 2004 Summer Olympics in Athens, Greece, from 13 to 29 August 2004. This was the nation's fourth consecutive appearance at the Summer Olympics since the post-Yugoslav era. The Croatian Olympic Committee sent the nation's smallest delegation to the Games since its debut in 1992. A total of 81 athletes, 66 men and 15 women, competed in 14 sports. Men's water polo, and men's handball were the only team-based sports in which Croatia had its representation in these Olympic Games.
Ethiopia competed at the 1960 Summer Olympics in Rome, Italy. Ten competitors, all men, took part in eight events in two sports. Abebe Bikila won the country's first ever Olympic medal by winning the men's marathon.
Iceland competed at the 1992 Summer Olympics in Barcelona, Spain.
Ghana competed at the 1960 Summer Olympics in Rome, Italy, for the first time as an independent nation. Previously, the Gold Coast had competed at the 1952 Summer Olympics. In total, 15 athletes competing in 2 sports represented Ghana.
Great Britain, represented by the British Olympic Association (BOA), competed as the host nation for the 1948 Summer Olympics in London. It was the second time that the United Kingdom had hosted the Summer Olympic Games, equalling the record of France and the United States to that point. British athletes have competed in every Summer Olympic Games. 404 competitors, 335 men and 68 women, took part in 139 events in 21 sports.
Morocco competed in the Summer Olympic Games for the first time at the 1960 Summer Olympics in Rome, Italy. 47 competitors, all men, took part in 45 events in 10 sports.
Pakistan competed at the 1960 Summer Olympics in Rome, Italy. 44 competitors, all men, took part in 35 events in 7 sports. Here, they won their first Olympic Games gold medal by defeating India in the final of the men's hockey competition. The country also landed their first individual Olympic Games medal, a bronze, through welterweight wrestler Mohammad Bashir in the freestyle contests. Making this Pakistan's most successful Olympics to date.
Indonesia competed at the 1960 Summer Olympics in Rome, Italy. 22 competitors, 20 men and 2 women, took part in 17 events in 8 sports.
The Federation of Malaya competed at the 1960 Summer Olympics in Rome, Italy. Nine competitors, all men, took part in eleven events in four sports. It was the second Olympic appearance by the nation, which expanded and was renamed as Malaysia in 1963.
Malaysia competed at the 1984 Summer Olympics in Los Angeles, United States. The nation returned to the Olympic Games after participating in the American-led boycott of the 1980 Summer Olympics. Twenty-one competitors, twenty men and one woman, took part in twelve events in five sports.
Suriname participated in the Olympic Games for the first time at the 1960 Summer Olympics in Rome, Italy, before becoming independent of the Netherlands. The games were held from 25 August to 11 September 1960. The nation sent a delegation of three people: two officials, attaché Lia Del Neri and secretary-general Freddy Glans, and one athlete, runner Wim Esajas, who was set to compete in the men's 800 metres. The national football and basketball teams failed to qualify. Esajas did not participate; he arrived late and missed his heat after being given wrong information by Glans.
Portugal competed at the 2008 Summer Olympics in Beijing, People's Republic of China. It was the nation's twenty-second consecutive appearance at the Olympics. The Olympic Committee of Portugal was represented by a delegation of 129 people, of which 77 were competitors participating in 16 sports. Nelson Évora, the 2007 triple jump world champion, was chosen as the flag bearer during the opening ceremony; he won the triple jump event, giving Portugal its fourth ever Olympic gold medal.
Kenya competed in the 2008 Summer Olympics held in Beijing, People's Republic of China from August 8 to August 24, 2008. Kenya won a total of 14 medals, 6 of them gold, its best ever performance at the Olympics.
Kenya competed at the 2012 Summer Olympics in London, from 27 July to 12 August 2012. This was the nation's thirteenth appearance at the Olympics, they did not participate in the 1976 Summer Olympics in Montreal and the 1980 Summer Olympics in Moscow because of the African and United States boycott.
The Middle Eastern nation of Iraq competed at the 2012 Summer Olympics in London, held from 27 July to 12 August 2012. This was the nation's thirteenth appearance at the Olympics since its debut at the 1948 Summer Olympics in the same host city.
Kenya competed at the 2016 Summer Olympics in Rio de Janeiro, Brazil, from 5 to 21 August 2016. This was the nation's fourteenth appearance at the Summer Olympics.
Djibouti 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. This was the nation's ninth appearance at the Summer Olympics; Djibouti did not field any athletes at the 2004 Summer Olympics in Athens. The delegation consisted of four athletes, three men and one women, competing in five events across three sports. Two athletes participated in the judo and swimming tournaments: Aden-Alexandre Houssein and Houssein Gaber Ibrahim. Athlete Ayanleh Souleiman, a returning competitor from the 2016 Rio Olympics competed in the men's 800 metres and 1500 metres events. Souhra Ali Mohamed, who had previously participated in the 2012 Summer Olympics competed in the women's 1500 metres event. Houssein lead the Djiboutian squad as the flagbearer in the opening ceremony with Souhra being the flagbearer for the closing ceremony.
Kenya 
Germany 
France 
Italy 
