Cape Verde competed at the 2012 Summer Olympics which were held in London, United Kingdom from 27 July to 12 August 2012. The country's participation at London marked its fifth appearance in the Summer Olympics since its debut in 1996. The delegation included Ruben Sança, a long-distance runner; Lidiane Lopes, a sprinter; and Adysângela Moniz, a judoka. Moniz and Sança were also selected as the flag bearers for the opening and closing ceremonies respectively. Of the three Cape Verdean athletes, only Moniz progressed further than the first round.
Chad competed at the 2012 Summer Olympics in London, which was held from 27 July to 12 August 2012. This marked the nation's eleventh appearance at the Summer Olympics since its debut in the 1964 Summer Olympics. The Chadian delegation included track and field athlete Hinikissia Ndikert and judoka Carine Ngarlemdana. Ngarlemdana was the flag bearer for the opening ceremony and Ndikert was the flag bearer for the closing ceremony. Neither of Chad's athletes progressed beyond the first round of their events. Chad was one of only two countries to have a female-only team at the 2012 games.
Comoros competed at the 2012 Summer Olympics in London, England, which was held from 27 July to 12 August 2012. The country's participation at London marked its fifth appearance in the Summer Olympics since its début at the 1996 Summer Olympics. The delegation included two track and field athletes: Maoulida Darouèche and Feta Ahamada, and one swimmer, Ayouba Ali Sihame, all three qualified for the Games through wildcard places. Ahamada was selected as the flag bearer for the opening ceremony and Darouèche held it at the closing ceremony. Ahamada won her heat in the preliminary round of the women's 100 metres but was eliminated in the heat stages, while Darouèche and Sihame did not advance beyond the first round of their respective events.
Djibouti competed at the 2012 Summer Olympics in London, from July 27 to August 12, 2012. This was the nation's seventh appearance at the Olympics.
Djibouti competed at the 2016 Summer Olympics in Rio de Janeiro, Brazil, from 5 to 21 August 2016. The nation's participation marked its eighth appearance at the Summer Olympics. Djibouti did not field any athletes at the 2004 Summer Olympics in Athens.
Papua New Guinea competed at the 2016 Summer Olympics in Rio de Janeiro, Brazil, from 5 to 21 August 2016. This was the nation's tenth appearance at the Summer Olympics.
Comoros competed at the 2016 Summer Olympics in Rio de Janeiro, Brazil, from 5 to 21 August 2016. This was the nation's sixth consecutive appearance at the Summer Olympics.
Yemen competed at the 2016 Summer Olympics in Rio de Janeiro, Brazil, from 5 to 21 August 2016. This was the nation's seventh consecutive appearance at the Summer Olympics, since its reunification in 1990.
American Samoa competed at the 2016 Summer Olympics in Rio de Janeiro, Brazil, from 5 to 21 August 2016. This was the nation's eighth consecutive appearance at the Summer Olympics.
Andorra 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 is the nation's twelfth consecutive appearance at the Summer Olympics.
Seychelles 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 ninth appearance at the Summer Olympics, with the exception of the 1988 Summer Olympics in Seoul because of its partial support to the North Korean boycott.
Sri Lanka 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 eighteenth appearance at the Summer Olympics, with the exception of the 1976 Summer Olympics in Montreal. Seven of the nation's previous Olympic appearances were under the name Ceylon.
Tonga 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 tenth consecutive appearance at the Summer Olympics.
Monaco competed at the 2020 Summer Olympics in Tokyo. Originally scheduled to take place from 24 July to 9 August 2020, the Games were rescheduled for 23 July to 8 August 2021, due to the COVID-19 pandemic. Since the nation's official debut in 1920, Monegasque athletes have appeared in every edition of the Summer Olympic Games throughout the modern era, except for three occasions; Monaco did not attend the 1932 Summer Olympics in Los Angeles at the period of the worldwide Great Depression, failed to register any athletes at the 1956 Summer Olympics in Melbourne, and also joined the United States-led boycott when Moscow hosted the 1980 Summer Olympics.
Saint Kitts and Nevis competed at the 2020 Summer Olympics in Tokyo. Originally scheduled to take place from 24 July to 9 August 2020, the event was postponed to 23 July to 8 August 2021, because of the COVID-19 pandemic. This was the nation's seventh appearance at the Summer Olympics since their debut in 1996. The delegation consisted of two athletes, competing in athletic events; Jason Rogers and Amya Clarke. For the first time, in an effort to promote gender equality, two flagbearers, one male and one female were allowed at the Olympics. Both athletes from Saint Kitts and Nevis bore the national flag at the opening ceremony. Saint Kitts and Nevis did not win any medals during the Tokyo Olympics. Rogers ranked third in the first round of the men's 100 metres and advanced to the semifinals where he was eliminated. Clarke also ranked third in her preliminary round of the women's 100 metres and advanced to round 1 where she ranked 7th and was eliminated.
Oman 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.
Madagascar sent a delegation that competed at the 2020 Summer Olympics in Tokyo. The games were originally scheduled to take place from 24 July to 9 August 2020, but were postponed to 23 July to 8 August 2021, due to the COVID-19 pandemic. It was the nation's thirteenth appearance at the Olympics, since its debut in 1964.
Kiribati competed at the 2020 Summer Olympics in Tokyo. Originally scheduled to take place from 24 July to 9 August 2020, it was postponed to 23 July to 8 August 2021, due to the COVID-19 pandemic. This marked the nation's fifth appearance at the Olympics.
Tuvalu competed at the 2020 Summer Olympics in Tokyo, which were held from 23 July to 8 August 2021. Originally scheduled to take place from 24 July to 9 August 2020, the event was postponed due to the COVID-19 pandemic. Their participation marked their fourth consecutive appearance at the Summer Olympics since their debut at the 2008 Summer Olympics. The Tuvaluan delegation consisted of the sprinters Karalo Maibuca and Matie Stanley, both of whom were competing in their first Olympics. Neither Maibuca nor Stanley managed to progress beyond the preliminary rounds of their events, although Maibuca set a Tuvaluan national record of 11.42 seconds in the men's 100 metres.
Sierra Leone competed at the 2020 Summer Olympics in Tokyo. Originally scheduled to for 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 twelfth appearance at the Summer Olympics, having appeared at all but two Games since its debut in 1968; Sierra Leone failed to register any athletes at the 1972 Summer Olympics in Munich and also joined the rest of the African nations to boycott the 1976 Summer Olympics in Montreal.
