Yemen sent a delegation to compete at the 2000 Summer Olympics in Sydney, Australia from 15 September to 1 October 2000. This was their third appearance at a Summer Olympic Games as a unified country. The Yemeni delegation consisted of two track and field athletes, Basheer Al-Khewani and Hana Ali Saleh. Neither advanced beyond the first round of their respective events.
Comoros sent a delegation to compete at the 2000 Summer Olympics in Sydney, Australia from 15 September to 1 October 2000. This was the Indian Ocean nation's second appearance at a Summer Olympic Games, following their debut four years earlier at the 1996 Atlanta Olympics. The delegation consisted of two track and field athletes: Hadhari Djaffar and Sandjema Batouli. Both raced in the 100 meters events, but neither advanced beyond the first round.
Jamaica sent a delegation to compete at the 2008 Summer Olympics, held in Beijing, China from August 8 to August 24, 2008. This was, by far, Jamaica's best showing at the Summer Olympics; it was the nation's largest delegation yet, and its athletes nearly doubled its total gold medal count in addition to breaking the nation's record for number of medals earned in a single games. Jamaica's appearance at Beijing was its fifteenth consecutive appearance and appearance as an independent nation, although it had previously participated in four other games as a British colony and as part of the West Indies Federation. In the 29 events that included Jamaican athletes, there were 26 cases in which a Jamaican athlete or relay progressed to a final round. Usain Bolt won three of Jamaica's six gold medals at Beijing, breaking an Olympic and world record in all three of the events in which he participated. Shelly-Ann Fraser led an unprecedented Jamaican sweep of the medals in the Women's 100 m. Female sprinter Veronica Campbell-Brown carried Jamaica's flag at the ceremonies.
The men's 100 metres competition at the 2012 Summer Olympics in London, United Kingdom was held at the Olympic Stadium on 4–5 August 2012. Seventy-four athletes from 61 nations competed. Each nation was limited to 3 athletes per rules in force since the 1930 Olympic Congress. The competition comprised four rounds: a preliminary round for entrants without the minimum qualifying standard, a heats round, followed by three semi-finals of eight athletes each, which then reduced to eight athletes for the final.
Jamaica competed at the 2012 Summer Olympics in London, from 27 July to 12 August 2012. This was Jamaica's most successful performance in the Summer Olympics; it was approximately the same size from the previous games with a delegation of 50 athletes, and its athletes broke the nation's record for the number of medals, won in a single games. Jamaica's participation in London marked its sixteenth appearance as an independent nation, although it had previously competed in four other games as a British colony, and as part of the West Indies Federation. Usain Bolt became the nation's greatest highlight of these games, having won three of Jamaica's four gold medals at London, and breaking an Olympic and world record in two of the three events in which he participated. Because of his repeated successes for the most medals and records, Bolt became Jamaica's first male flag bearer at the opening ceremony since 1984.
The British Virgin Islands sent a delegation to compete at the 2012 Summer Olympics in London, United Kingdom, which took place between 27 July to 12 August 2012. The country's participation in London marked its eighth appearance at the Summer Olympics since its debut in the 1984 Summer Olympics. The British Virgin Islands delegation included two track and field athletes, 100 meter sprinters J'maal Alexander and Tahesia Harrigan-Scott. Alexander failed to progress through the heats whilst Harrigan-Scott was eliminated in her event's quarterfinals.
The Gambia competed at the 2012 Summer Olympics in London, which was held from 27 July to 12 August 2012. The country's participation at London marked its eighth appearance in the Summer Olympics since its début at the 1984 Summer Olympics. The delegation included two athletes, Suwaibou Sanneh and Saruba Colley, the former had qualified by setting a qualifying time that fell within the required standard and the latter entered via a wildcard place. Sanneh was selected as the flag bearer for both the opening and closing ceremonies. Sanneh became the first Gambian athlete to advance into the semi-finals of the men's 100 metres, while Colley was eliminated after the quarter-final stages of the Women's 100 metres.
The Marshall Islands marked its second consecutive Olympiad, at the 2012 Summer Olympics in London, from July 27 to August 12, 2012. The Olympian delegation included two men and two women, one male and one female athlete in athletics and one male and one female athlete in swimming. Middle-distance runner Haley Nemra was honored as the national flag bearer at the opening ceremony. The Marshall Islands continued their streak of bringing home no medals.
Marcela Valeria Britos is a Uruguayan track and field athlete, who specialized in middle distance running. She represented Uruguay at the 2008 Summer Olympics in Beijing, and competed in the women's 800 metres. She ran in the third heat of the event, against six other athletes, including Kenya's Pamela Jelimo, who eventually became an Olympic champion in the final. Britos finished the race in last place, with a time of 2:08.98, but was upgraded to sixth position in this heat, when Croatia's Vanja Perišić had been disqualified for failing the doping test.
Mowen Boino is a Papua New Guinean track and field athlete, who specialized in 400 metres and in 400 metres hurdles. He is a three-time Olympian and four-time national record holder for the 400 m hurdles. He also achieved his personal best time of 50.37 seconds at the 2006 Commonwealth Games in Melbourne, Australia.
Taylor Milne is a Canadian middle distance runner. Milne made his official debut at the 2008 Summer Olympics in Beijing, where he competed in the 1500 metres. At the 2016 Olympics he was eliminated in the heats of the 3000 m steeplechase.
Carline Muir is a Canadian sprinter, who specialized in the 400 metres. She won the bronze medal for the 400 metres, and ultimately, led her national team to claim the sprint relay title at the 2009 Summer Universiade in Belgrade, Serbia. She is also a three-time junior national champion, a two-time silver medalist at the Canadian Track and Field Championships.
Adrienne Power is a Canadian sprinter, who specialized in the 200 metres. She won two bronze medals for both the 200 metres and 4×400-metre relay at the 2010 Commonwealth Games in Delhi, India.
Sergey Pakura is a Kyrgyzstani middle-distance runner. Pakura represented Kyrgyzstan at the 2008 Summer Olympics in Beijing, where he competed for the men's 800 metres. He ran in the seventh heat, against six other athletes including American middle-distance runner Andrew Wheating, and Robert Lathouwers of the Netherlands. He finished the race in last place by two seconds behind Jamaica's Aldwyn Sappleton, with a time of 1:50.54. Pakura, however, failed to advance into the semi-finals, as he placed fifty-second overall, and was ranked farther below two mandatory slots for the next round.
Oleg Borisovich Juravlyov is an Uzbekistani sprinter. He is a two-time national champion for the 100 and 200 metres, and also, a member of the national sprint relay team at the 2000 Summer Olympics in Sydney.
Zenaide Vieira is a Brazilian steeplechase runner. She won the bronze medal for the 3000 metres steeplechase at the 2007 Pan American Games in Rio de Janeiro, with a time of 9:55.71.
Sandrine Carmen Genevieve Thiébaud-Kangni is a French-Togolese Athlete 1990 tp 2000. 400 metres French Junior Record older since 1995. 53sec73 .4×400 meters 3.32.79 transfere allégeance 2001 to Togolese sprinter and heptathlete. She is a two-time Olympian and a multiple-time national record holder for the 400m and heptathlon. She is also the daughter of middle-distance runner Roger Kangni, who competed in the 800 metres at the 1972 Summer Olympics in Munich.
Kia Davis is a Liberian-American sprinter. She is a multiple-time national record holder in the sprint and hurdles, a three-time USA Track & Field national indoor finalist for the 60 m hurdles, and holds a dual citizenship for Liberia and the United States in order to compete internationally for her categories. She also won the silver medal, as a member of the U.S. team, in the women's 4 × 400 m relay at the 2006 IAAF World Indoor Championships in Moscow, Russia.
Allison Magdalene George is a Grenadian sprinter, who specialized in the 200 metres. She set a personal best time of 22.72 seconds, by finishing fourth at the 2008 Big 12 Outdoor Track and Field Championships in Boulder, Colorado.
Rudolf Götz is a Czech sprinter, who specialized in the 400 metres. He set a personal best time of 45.78 seconds at the 2008 Ostrava Golden Spike in Ostrava, earning him a spot on the Czech track and field team for the Olympics. He is also a member of the athletics team for ASK Slavia Praha, and is coached and trained by Petr Novotny.
Jamaica 
