Sunday Bada was a Nigerian sprinter who specialized in the 400 metres event. He won three medals at the World Indoor Championships, including a gold medal in 1997. His personal best time was 44.63 seconds, and with 45.51 seconds indoor he holds the African indoor record. He set a national record in the 4 x 400 metres relay at the 2000 Olympics, where the Nigerian team also won gold medals after the disqualification of the US.
Louis Jacobus van Zyl, better known as L. J. van Zyl, is a South African athlete competing in the 400 metre hurdles. He is the South African record holder in the event with a personal best of 47.66 seconds, which he achieved twice, three months apart. His time ranks him in the all-time top 25. He is a three-time African Champion in the event and competed for his country at the 2008, 2012 and 2016 Summer Olympics.
Oludamola Bolanle ("Damola") Osayomi is a Nigerian sprinter who specializes in the 100 metres and 200 metres. She is a four-time gold medallist at the African Championships in Athletics and won an Olympic silver medal with Nigeria in the 4×100 metres relay at the 2008 Beijing Olympics. She also won the 100 and 200 m sprints at the 2007 All-Africa Games.
Sally Pearson, OAM is a retired Australian athlete who competed in the 100 metre hurdles. She is the 2011 and 2017 World champion and 2012 Olympic champion in the 100 metres hurdles. She also won a silver medal in the 100 m hurdles at the 2008 Summer Olympics and the 2013 World Championships.
Blessing Oghnewresem Okagbare-Otegheri is a former Nigerian track and field athlete who specialized in long jump and sprints. She is an Olympic and World Championships medallist in the long jump and a world medalist in the 200 metres. Okagbare also holds the women's 100 metres Commonwealth Games record at 10.85 seconds. She is currently serving a 10-year ban for breaching multiple World Athletics anti-doping rules. Her ban expires on 30 July 2032.
Amantle Montsho is a female sprinter from Botswana who specializes in the 400 metres. She represented her country at the 2004 and 2008 Summer Olympics, reaching the final at the latter edition. She was the first woman to represent Botswana at the Olympics. She has also competed at the World Championships in Athletics and the IAAF World Indoor Championships, and is the former World Champion over the 400m, winning in a personal best time of 49.56 in Daegu.
Aleksandra Andreyevna Fedoriva is a Russian track and field athlete who competes mainly in sprinting events.
David "Dai" Greene is a British hurdler who specialises in the 400 metres hurdles, competing internationally for both Wales and Great Britain, as well as Europe in the IAAF Intercontinental Cup.
Asami Chiba, or Tanno, is a Japanese sprinter who specialises in the 400 metres. She is the Japanese record holder in the event, and has also broken the national record in the 4×400 metres relay on multiple occasions. She is a member of Natureal Athlete Club in Japan and is coached by Kazuhisa Kawamoto.
Spencer gave birth to son Michael Carter Jr on April 25,2021
Eilidh Doyle is a retired British track and field athlete. Originally running as Eilidh Child, she specialised in the 400 metres hurdles outdoors, and the 400 metres flat indoors, as well as the 4 x 400 metres relay on both surfaces. She represented Great Britain at the 2012 Olympic Games in London, and won an Olympic bronze medal in the 4 x 400 metres relay at the 2016 Games in Rio de Janeiro. Individually, she is the 2014 European Champion and a three-time Commonwealth silver medalist in the 400 metres hurdles.
Wassana Winatho, also known as Amornrat Winatho and Vassanee Vinatho, is a Thai track and field athlete who specialises in the heptathlon and the 400 metres hurdles. She represented Thailand at the 2008 Summer Olympics and competed at five consecutive editions of the Asian Games.
Anna Vasylivna Ryzhykova, nee Yaroshchuk is a Ukrainian track and field athlete who specialises in the 400 metres hurdles. At the European Athletics Championships, she won silver medals in 2012 and 2018, and bronze in 2022. Ryzhykova placed fifth at the 2020 Tokyo Olympics.
Cornel Edwin Fredericks is a South African track and field athlete who competes in the 400 metres hurdles. His personal best for the event is 48.14 seconds.
Omar Cisneros Bonora is a Cuban track and field athlete who competes in the 400 metres hurdles. He is the Cuban national record holder for the event with his personal best of 47.99 seconds. He won gold medals in the hurdles and 4×400 metres relay at the Pan American Games in 2011.
Gnima Faye is a Senegalese track and field athlete who competes in the 100 metres hurdles. She was the 2012 African champion in the event and has a personal best of 13.17 seconds.
Regina George Grause is an American-born Nigerian sprinter who specializes in the 400 metres. She represented Nigeria at the 2012 Summer Olympics and was the silver medallist at the African Championships in 2012.
Oluwakemi "Kemi" Adekoya is a Nigerian-born track and field athlete who competes for Bahrain. She specialises in the 400 metres hurdles and has a personal best of 53.39 seconds – a Bahraini and Asian record. In January 2019, it was reported that Adekoya tested positive for an illegal steroid stanozolol in an out-of-competition test in November 2018 and was provisionally suspended. All of her results achieved after 24 August 2018 were also stripped.
Janieve Russell is a Jamaican track and field athlete who competes mainly in the 400 metres hurdles and the 400 metres sprint. She won an Olympic bronze medal in the 4 × 400 m relay in Tokyo 2021, where she also finished fourth in the 400m hurdles final in a personal best of 53.08 secs. She is a four-time Commonwealth Games gold medallist, winning the 400m hurdles title in 2018 and 2022, and the 4 × 400 m relay in 2014 and 2018. She has also won two relay silvers at the World Championships and a relay gold at the World Indoor Championships.
Oluwatobiloba Ayomide "Tobi" Amusan is a Nigerian track and field athlete who specialises in the 100 metres hurdles and also competes as a sprinter. Amusan is the current world record holder in the 100 metres hurdles with a time of 12.12 seconds which she set at the 2022 women's 100 metres hurdles semi final in Eugene Oregon. She is the current Commonwealth and African champion in the 100 m hurdles, as well as the meet record holder in those two competitions. Amusan became the first ever Nigerian world champion and world record holder in an athletics event when she won the 2022 World Championships 100 m hurdles gold medal, setting the current world record of 12.12 seconds (+0.9m/s) in the semi-final, followed up by a 12.06 seconds (+2.5m/s) in the final. She won back-to-back Commonwealth and African titles in 2018 and 2022 in the 100 m hurdles and is also a two-time African Games champion in the event. She is also the current Diamond league champion in the 100 metres hurdles having won the final in 12.33 seconds (+1.8m/s) achieving a winning streak in 2021, 2022 and 2023.
Nigeria 
