Christine Ijeoma Ohuruogu, MBE is a British former track and field athlete who specialised in the 400 metres, the event for which she is an Olympic, World and Commonwealth champion. The Olympic champion in 2008, and silver medalist in 2012, she is a double World Champion, having won the 400 m at the 2007 and 2013 World Championships. She has also won six World championship medals in the women's 4 × 400 m relay as part of the Great Britain and Northern Ireland team and bronze Olympic medals with the women's 4 × 400 m relay at the 2008 Beijing Games and the 2016 Rio Games, her final Olympics. Ohuruogu shares with Merlene Ottey and Usain Bolt the record for medalling in most successive global championships – 9 – between the 2005 World Championships in Athletics and the 2016 Summer Olympics.
Elizabeth Kimberly Tweddle is a retired British artistic gymnast. Renowned for her uneven bar and floor routines, she was the first female gymnast from Great Britain to win a medal at the European Championships, World Championships, and Olympic Games. Tweddle, known for her consistency and longevity as an elite gymnast, is regarded as a pioneer of the renaissance of British gymnastics at the beginning of the twenty-first century that saw the country's gymnastics programme progress from 'also ran' to consistent global competitiveness, and along with peers such as Vanessa Ferarri of Italy and Isabelle Severino of France, helped begin a period of significant success for western European gymnasts globally.
Rebecca Adlington is an English former competitive swimmer who specialised in freestyle events in international competition. She won two gold medals at the 2008 Summer Olympics in the 400-metre freestyle and 800-metre freestyle, breaking the 19-year-old world record of Janet Evans in the 800-metre final. Adlington was Britain's first Olympic swimming champion since 1988, and the first British swimmer to win two Olympic gold medals since 1908. After winning her first World Championship gold over 800 metres in 2011, along with silver in the 400 metres at the same meet, she won bronze medals in both the women's 400-metre and 800-metre freestyle events in the 2012 Summer Olympics in London. Adlington is one of the few people to have won Olympic Games, World Championships, continental championships and Commonwealth Games gold medals, although she did not win a set in any one event.
Jennifer Simpson is an American middle- and long-distance runner, formerly a steeplechaser. She won the gold medal in the 1500 meters at the 2011 World Championships, silvers at the 2013 and 2017 World Championships, and a bronze at the 2016 Rio Olympics, becoming the first American woman to win an Olympic medal in the event.
Alexandra Rose Raisman is a retired American artistic gymnast and two-time Olympian. She was captain of both the 2012 "Fierce Five" and 2016 "Final Five" U.S. women's Olympic gymnastics teams, which won their respective team competitions.
Sri Lanka participated 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 sixteenth appearance in the Summer Olympics since its debut at the 1948 Summer Olympics, having missed only the 1976 Games. The delegation consisted of seven competitors: two athletics competitors, two badminton players one shooter and two short-distance swimmers. Cooray, Samarakoon and Karunaratne qualified for the Games by meeting their respective qualifying standards; the remainder of the team entered through wildcard or quota places. Karunarante was the flag bearer for the opening and closing ceremonies.
Qatar 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 sent by the Qatar Olympic Committee consisted of twelve athletes in athletics, shooting, swimming and table tennis. The 2012 Games marked the first time Qatar sent female athletes to the Olympic Games; following the 2008 Summer Olympics, it had been one of only three countries, along with Saudi Arabia and Brunei, to never have done so.
San Marino 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 thirteenth appearance in the Summer Olympics since its début at the 1960 Summer Olympics. The delegation sent by the Sammarinese National Olympic Committee consisted of four athletes: sprinter Martina Pretelli, archer Emanuele Guidi, trap shooter Alessandra Perilli and short-distance swimmer Clelia Tini.
The Women's 3000 metres steeplechase at the 2012 Summer Olympics took place on 4–6 August at the Olympic Stadium.
Uganda competed at the 2012 Summer Olympics in London, which was held from 27 July to 12 August 2012. The country's participation there marked its 13th appearance in the Summer Olympics since its début at the 1956 Summer Olympics. The delegation consisted of eleven track and field athletes that included Moses Ndiema Kipsiro, Benjamin Kiplagat, and Stephen Kiprotich, one each in badminton and weightlifting, and two swimmers. Ekiring, Ssekyaaya, Mugula, and Lunkuse had qualified through wildcard places, while the rest of the delegation satisfied the Games' qualification standards for their respective events. Mugula was selected as the team captain. Mugula was also selected as the flag bearer for both the opening and closing ceremonies. The country's best result at these Games was a gold medal for Kiproitch in the men's marathon, its first such medal since the 1972 Munich Olympics.
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.
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.
Equatorial Guinea 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 track and field athletes, Benjamín Enzema and Bibiana Olama who both qualified for the Games via wildcard places because their fastest times did not meet the required qualification standards. Olama was selected as the flag bearer for both the opening and closing ceremonies. Both athletes did not advance beyond the first round of their respective events.
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.
Zambia competed at the 2012 Summer Olympics in London, held from 27 July to 12 August 2012. The country's participation at London marked its twelfth appearance in the Summer Olympics since its début at the 1964 Summer Olympics. The delegation consisted of seven competitors; three track and field athletes Gerald Phiri, Prince Mumba and Chauzje Choosha, one each in Boxing and Judo and two swimmers, Zane Jordan and Jade Ashleigh Howard. Phiri, Mumba, Choombe and Munyonga had qualified by meeting the standards in their respective sports, and Choosha, Jordan and Howard qualified by wildcard places. Mumba was the national flag bearer at the opening and closing ceremonies.
Nepal 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 twelfth appearance in the Summer Olympics since its début at the 1964 Summer Olympics. The delegation included two track and field athletes; Tilak Ram Tharu and Pramila Rijal, one shooter Sneh Rana and two swimmers; Prasiddha Jung Shah and Shreya Dhital; all five competitors qualified for the Games through wildcard places from their respective sporting governing bodies. It was the smallest delegation sent by Nepal since the 1992 Summer Olympics. Shah was selected as the flag bearer for the opening and closing ceremonies. Four of the five athletes were unable to progress beyond the first stages of their respective events while Rana finished 54th in the women's 10 metre air rifle shooting competition.
Malawi 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 ninth appearance in the Summer Olympics since its début at the 1972 Summer Olympics. The delegation included two track and field athletes; Mike Tebulo and Ambwene Simukonda, and one swimmer; Joyce Tafatatha. Tebulo and Simukonda qualified through wildcard places for their respective events. Tebulo was selected as the flag bearer for the opening and closing ceremonies. Tebulo finished 44th in the men's marathon, while Simukonda did not advance beyond the first round of the women's 400 metres. Tafatatha won her heat in the women's 50 metre freestyle but her time was not fast enough to allow her to progress into the semi-finals of the event.
Lesotho 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 tenth appearance in the Summer Olympics since its début at the 1972 Summer Olympics. The delegation included three track and field athletes; Tsepo Ramonene, Mosito Lehata and Mamorallo Tjoka, and one swimmer; Masempe Theko. Ramonene and Lehata qualified for the Games by meeting qualification standards, while Tjoka and Theko made the Olympics through wildcard places. Tjoka was selected as the flag bearer for the opening ceremony while Lehata held it at the closing ceremony. Ramonene finished last in the men's marathon and was revived by medical personnel during the event. Lehata did not progress to the semi-finals of the men's 200 metres and Tjoka finished in 90th in the women's marathon. Theko finished 73rd overall in the women's 50 metre freestyle and did not progress to the semi-finals of the event.
The Women's 3000 metres steeplechase competition at the 2016 Summer Olympics took place between 13–15 August at the Olympic Stadium.
Aisha Praught-Leer is a middle-distance runner from Illinois competing for Jamaica. She attended Woodrow Wilson Middle School and Moline High School. Praught competed in Athletics at the 2016 Summer Olympics after running the 1500 meters and steeplechase standards in 2015. Praught competed in the Women's 3000 metres steeplechase event at the 2015 World Championships in Athletics in Beijing, China, but was disqualified. She was the gold medalist in the steeplechase at the 2018 Commonwealth Games.
Ethiopia 
