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.
Anna Stylianou is a Cypriot swimmer, who specialized in freestyle events. Stylianou made her official debut, as a 14-year-old, at the 2000 Summer Olympics in Sydney, where she placed forty-fourth overall in the women's 100 m freestyle, with a time of 59.08 seconds.
Choi Hye-Ra is a South Korean swimmer, who specialized in butterfly and individual medley events. She collected four medals in the 200 m butterfly, 200 m individual medley, and the 800 m freestyle relay at the 2006 Asian Games in Doha, Qatar, and at the 2010 Asian Games in Guangzhou, China. She also won a silver medal in the same medley distance at the 2011 Summer Universiade in Shenzhen, China, with a time of 2:14.17. She is a resident athlete of Osan Sports Club in Seoul.
Justine Bayigga is a Ugandan sprinter, who specialized in the 400 metres. Bayigga represented Uganda at the 2008 Summer Olympics in Beijing, where she competed in the women's 400 metres. She ran in the second heat, against six other athletes, including Italy's Libania Grenot, and future world-record holder Amantle Montsho of Botswana. She completed the sprint race in last place, with a time of 54.15 seconds, failing to advance into the semi-finals.
Antonella Scanavino Crespo is a Uruguayan swimmer, who specialized in butterfly and individual medley events. At age fifteen, she became one of the youngest swimmers to compete at the 2008 Summer Olympics, representing her nation Uruguay. Antonella Scanavino is the daughter of the nation's former long-distance freestyle champion Carlos Scanavino, who won silver at the 1987 Pan American Games in Indianapolis, Indiana, United States, and had appeared in two editions of the Olympic Games.
Yenima Arencibia Barrisontes is a female Cuban sprint hurdler.
Susana Aylen Clement Quezada is a Cuban track and field athlete, who specialized in the 400 metres. She won gold medals for the national relay team at the 2009 Central American and Caribbean Championships in Havana, and also, at the 2011 Pan American Games in Guadalajara, Mexico.
Dedeh Erawati is an Indonesian sprint hurdler. She is a four-time medalist and two-time defending champion at the SEA Games. She won the bronze medal at the 2009 Asian Athletics Championships in Guangzhou, China, with a time of 13.32 seconds, finishing behind Japan's Asuka Terada and China's Sun Yawei, who claimed the gold in the hurdles. She also set both her personal best and national record of 13.18 seconds at the 2012 Taiwan Open in Taipei, Taiwan.
Rachidatou Seini Maikido is a Nigerien track and field athlete, who specialized in the 400 metres. Seini Maikido represented Niger at the 2008 Summer Olympics in Beijing, where she competed for the women's 400 metres. She ran in the third heat of the first preliminary round, finishing the race in last place. She also set both her personal best and a national record of 1:03.19, being one of two athletes who completed the heat after a minute. Seini Maikido, however, failed to advance into the semi-finals, as she placed forty-ninth overall, and ranked below three mandatory slots for the next round.
Precious Oluoma Nwoke Bichiri is a Nigerian track and field athlete, who specialized in the 400 metres. Nwoke competed for the women's 4 × 400 m relay at the 2008 Summer Olympics in Beijing, along with her teammates Folashade Abugan, Joy Amechi Eze, and Muizat Ajoke Odumosu. She ran on the third leg of the second heat, with an individual-split time of 51.83 seconds. She and her team finished the relay in fourth place for a seasonal best time of 3:24.10, giving them a qualifying slot for the final round based on performance. By the following day, Nwoke and her team placed seventh in the finals, with another seasonal best time of 3:23.74.
Dimitra Dova is a Greek sprinter, who specialized in the 400 metres. She won the gold medal for her category at the 2005 Mediterranean Games in Almería, Spain, with a time of 52.67 seconds, defeating her compatriot Phara Anacharsis by three hundredths of a second (0.03).
Sayaka Aoki is a Japanese track and field sprinter and hurdler, who specializes in the 400 metres sprint and 400 metres hurdles. She competed for her country as part of the Japanese women's 4 × 400 metres relay team at the Summer Olympics in 2008 and the World Championships in Athletics three times. She has been a four-time medallist in the relay at the Asian Athletics Championships, including a gold medal in 2011. She won her first major international medal in the hurdles – a bronze – at the 2017 Asian Athletics Championships.
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.
Josiane da Silva Tito is a Brazilian sprinter and middle-distance runner.
Maria Laura Almirão is a Brazilian sprinter, who specialized in the 400 metres. She is a two-time Olympian and a five-time medalist for the 400 metres and sprint relay at the Ibero-American Championships.
Edit Vári is a Hungarian sprint hurdler. At age thirty-three, Vari made her official debut for the 2008 Summer Olympics in Beijing, where she competed in the women's 100 m hurdles. She ran in the third heat against seven other athletes, including Australia's Sally McLellan, who later won the silver medal in the final. She finished the heat in last place by three hundredths of a second (0.03) behind Greece's Flora Redoumi, with a slowest possible time of 13.59 seconds. Vari, however, failed to advance into the semi-finals, as she placed thirty-sixth overall, and was ranked below two mandatory slots for the next round.
Vanja Perišić is a Croatian middle distance runner, who specialized in the 800 metres. Perisic represented Croatia at the 2008 Summer Olympics in Beijing, where she competed for 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 won the gold medal in the final. She finished the race in sixth place by seventy-one hundredths of a second (0.71) behind Mauritius' Annabelle Lascar, with a time of 2:06.82. Perišić, however, failed to advance into the semi-finals, as she placed thirty-fifth overall, and was ranked farther below three mandatory slots for the next round.
Élodie Guégan is a French middle distance runner, who specialized in the 800 metres. She won two medals, silver and bronze, for the 800 metres at the 2005 European Athletics U23 Championships in Erfurt, Germany, and at the 2007 European Athletics U23 Championships in Debrecen, Hungary. She also set a personal best time of 1:58.93 by finishing fifth at the 2008 ÅF Golden League in Saint-Denis, Paris.
Anna Rostkowska is a Polish middle-distance runner, who specialized in the 800 metres. She won a gold medal for the 800 metres at the 2001 European Athletics U23 Championships in Amsterdam, Netherlands, and silver at the 2003 Summer Universiade in Jeju City, South Korea. She also set a personal best time of 1:58.72 by finishing fourth at the 2008 ÅF Golden League in Saint-Denis, Paris.
Tsholofelo Thipe is a South African sprinter, who specialized in the 400 metres. She set a personal best time of 51.15 seconds by winning the 400 metres event at the 2009 South African Championships in Stellenbosch. She was born in Rustenburg, North West Province.
Uruguay 
