South Africa competed at the 2004 Summer Olympics in Athens, Greece, from 13 to 29 August 2004. This was the nation's sixteenth overall and fourth consecutive appearance at the Summer Olympics in the post-apartheid era. The South African Sports Confederation and Olympic Committee (SASCOC) sent a total of 106 athletes to the Games, 66 men and 40 women, to compete in 19 sports. Field hockey was the only team-based sport in which South Africa had its representation at these Games. There was only a single competitor in archery, canoeing, diving, artistic and rhythmic gymnastics, judo, sailing, shooting, taekwondo, and wrestling.
The women's 800 metres at the 2004 Summer Olympics as part of the athletics program were held at the Athens Olympic Stadium from August 20 to 23.
Great Britain, the team of the British Olympic Association (BOA), competed at the 2004 Summer Olympics in Athens, Greece, from 13 to 29 August 2004 with the team of selected athletes was officially known as Team GB. The British sent a wide-ranging delegation to the Games, continuing its ubiquitous presence at the Olympics. Great Britain's 264 athletes, 161 men and 103 women, competed in 22 disciplines throughout the two-week event. The team entered the opening ceremony behind the Union Flag carried by judoka Kate Howey. Double gold medal winner Kelly Holmes carried the flag at the closing ceremony.
The Russian Federation competed at the 2008 Summer Olympics, held in Beijing, China, represented by the Russian Olympic Committee. Russia competed in all sports except baseball, field hockey, football, softball, and taekwondo. It ranked third in the medal table by the number of gold (24) and overall (60) medals. Russia also had 14 medals stripped for doping violations, the most of any nation at the 2008 Olympics, although in terms of gold medals it got a net positive of +1.
India competed at the 2008 Summer Olympics in Beijing, People's Republic of China. India was represented by the Indian Olympic Association (IOA). A contingent of 57 athletes in 12 sports represented India, and had a support-staff of 42 officials.
Hungary competed at the 2008 Summer Olympics in Beijing, China. The country sent 131 individual competitors plus the men's and women's water polo teams and the women's handball team for a total of 171 athletes taking part in the 2008 Summer Olympics. Hungary's gold medal count of 3 was the lowest in the nation's Summer Olympic history since the 1924 Paris Summer Olympics. Its total medal count of 10 was the lowest since the 1928 Summer Olympics in Amsterdam.
Kazakhstan competed at the 2012 Summer Olympics in London, from 27 July to 12 August 2012. This was the nation's fifth appearance at the Summer Olympics in the post-Soviet era.
The Russian Federation competed at the 2012 Summer Olympics in London, United Kingdom, from 27 July to 12 August 2012. This was the nation's fifth consecutive appearance at the Summer Olympics as an independent nation. The Russian Olympic Committee sent a total of 436 athletes to the Games, 208 men and 228 women, to compete in 24 sports. For the first time in its Olympic history, Russia was represented by more female than male athletes.
Ireland competed at the 2012 Summer Olympics in London, United Kingdom, from July 27 to August 12, 2012. This was the nation's twentieth appearance at the Summer Olympics.
Vanuatu competed at the 2012 Summer Olympics in London, from 27 July to 12 August 2012. This was the nation's seventh appearance at the Olympics.
The United States' unincorporated territory of Guam competed at the 2012 Summer Olympics in London, held from July 27 to August 12, 2012. This was the territory's seventh consecutive appearance at the Olympics.
The African island nation of São Tomé and Príncipe competed at the 2012 Summer Olympics in London, held from 27 July to 12 August 2012. This was the nation's fifth appearance at the Olympics since its debut in 1996. Two track and field athletes, Christopher Lima da Costa and Lecabela Quaresma were selected to the team by wildcard places, without having qualified at any sporting event. Quaresma was selected as flag bearer for the opening and closing ceremonies. Neither of the two athletes progressed beyond the first round of their respective events.
The women's 800 metres competition at the 1976 Summer Olympics in Montreal, Quebec, Canada was held at the Olympic Stadium from 23 to 26 July.
The women's 800 metres event at the 2016 Summer Olympics took place between 17–20 August at the Olympic Stadium.
The women's 1500 metres event at the 2016 Summer Olympics took place between 12–16 August at the Olympic Stadium.
Costa Rica competed at the 2016 Summer Olympics in Rio de Janeiro, Brazil, from 5 to 21 August 2016. This was the nation's fifteenth appearance at the Summer Olympics, since its debut in 1936.
Algeria competed at the 2016 Summer Olympics in Rio de Janeiro, Brazil, from 5 to 21 August 2016. Since the nation's debut in 1964, Algerian athletes had appeared in every edition of the Summer Olympic Games, but did not attend the 1976 Summer Olympics in Montreal, Quebec, Canada, because of the African boycott.
The rate of participation of women in the Olympic Games has been increasing since their first participation in 1900. Some sports are uniquely for women, others are contested by both sexes, while some older sports remain for men only. Studies of media coverage of the Olympics consistently show differences in the ways in which women and men are described and the ways in which their performances are discussed. The representation of women on the International Olympic Committee has historically run well behind the rate of female participation, and long missed its target of a 20% minimum presence of women on their committee. As of 2023, 41.1% of members are women. The 2024 Paris Olympics were notable for being the first to have the goal of achieving gender parity between men and women.
The women's 800 metres event at the 2020 Summer Olympics took place from 30 July to 3 August 2021 at the Japan National Stadium. 46 athletes from 29 nations competed. 19-year-old Athing Mu of the United States won the gold medal. The silver medal went to Keely Hodgkinson of Great Britain, and the bronze medal went to Mu's American teammate Raevyn Rogers.
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.
