Togo competed at the 2004 Summer Olympics in Athens, Greece, from 13 to 29 August 2004. The country's participation at Athens marked its seventh appearance in the Summer Olympics since its debut at the 1972 Summer Games in Munich, West Germany. The delegation included two track and field athletes and a single canoeist; Jan Sekpona in the men's 800 metres, Sandrine Thiébaud-Kangni in the women's 400 metres, and Benjamin Boukpeti in the men's K-1. Both Sekpona and Thiébaud-Kangni were eliminated in the first round of their competitions, while Boukpeti progressed to the semi-finals.
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.
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.
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.
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.
Mahau Camargo Suguimati is a Brazilian track hurdler of Japanese ancestry. Since the age of eight, Suguimati had lived and studied for sixteen years in Niiza, Saitama Prefecture, Japan. Suguimati also attended schools around the prefecture, where he discovered his natural ability and talent of running and hurdling, under his personal coach and trainer Atsushi Hishinuma. He made his international debut, and represented his birth nation Brazil at the 2007 Pan American Games in Rio de Janeiro, where he finished seventh in the final of the 400 m hurdles, with his personal best time of 49.63 seconds.
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.
Naiel Santiago D'Almeida is a Santomean sprinter, who specialized in the 400 metres. D'Almeida represented São Tomé and Príncipe at the 2008 Summer Olympics in Beijing, where he competed for the men's 400 metres. He ran in the seventh heat, against seven other athletes, including defending Olympic champion Jeremy Wariner of the United States. He finished the race in last place by two seconds behind Benin's Mathieu Gnanligo, with a time of 49.08 seconds. D'Almeida, however, failed to advance into the semi-finals, as he placed fifty-fourth overall, and was ranked farther below three mandatory slots for the next round.
Konstadinos Anastasiou is a Greek sprinter, who specialized in the 400 metres. Anastasiou competed for the men's 4 × 400 m relay at the 2008 Summer Olympics in Beijing, along with his teammates Stylianos Dimotsios, Dimitrios Gravalos, and Pantelis Melachroinoudis. He ran on the anchor leg of the second heat, with an individual-split time of 46.63 seconds. Anastasiou and his team finished the relay in seventh place for a seasonal best time of 3:04.30, failing to advance into the final.
Dimitrios Gravalos is a Greek sprinter, who specialized in the 400 metres. He won the gold medal for the 400 metres at the 2003 European Junior Championships in Tampere, Finland, with a time of 46.54 seconds.
Pantelis Melachroinoudis is a Greek sprinter, who specialized in the 400 metres. Melachroinoudis competed for the men's 4 × 400 m relay at the 2008 Summer Olympics in Beijing, along with his teammates Stylianos Dimotsios, Konstadinos Anastasiou, and Dimitrios Gravalos. He ran on the third leg of the second heat, with an individual-split time of 45.15 seconds. Melachroinoudis and his team finished the relay in seventh place for a seasonal best time of 3:04.30, failing to advance into the final.
Mitsuhiro Abiko is a Japanese sprinter, who specialized in the 400 metres. Abiko competed in the men's 4 × 400 m relay at the 2008 Summer Olympics in Beijing, along with his teammates Kenji Narisako, Dai Tamesue, and Yoshihiro Horigome. He ran on the starting leg of the second heat, with an individual-split time of 46.70 seconds. Abiko and his team finished the relay in sixth place for a seasonal best time of 3:04.18, failing to advance into the final.
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.
Myhaylo Mykolayovych Knysh is a Ukrainian sprinter, who specialized in the 400 metres. Knysh made his official debut for the 2004 Summer Olympics in Athens, where he placed sixth for the national sprint team in the preliminary heats of men's 4 × 400 m relay, with a time of 3:04.01.
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.
Yoel Armando Tapia Gómez is a Dominican sprinter, who specialized in the 400 metres. He won two medals for the national relay team at the 2007 Pan American Games in Rio de Janeiro, Brazil, and also, at the 2011 Pan American Games in Guadalajara, Mexico.
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.
Brice Panel is a French sprinter, who specialized in the 400 metres. He set his personal best time of 45.54 seconds by finishing second at the Resisprint meeting in La Chaux-de-Fonds.
Pieter Smith is a South African sprinter, who specialized in the 400 metres. He set his personal best time of 45.63 seconds by winning the 400 metres event at the 2009 South African Championships in Stellenbosch.
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.
San Marino 
