Roger Anthony BlackMBE is an English former athlete who competed internationally for Great Britain and England. During his athletics career, he won individual silver medals in the 400 metres sprint at both the Olympic Games and World Championships, two individual gold medals at the European Championships, and 4 × 400 metres relay gold medals at both the World and European Championships.
Kerron Stephon Clement is a Trinidadian-born American track and field athlete who competes in the 400-meter hurdles and 400-meter sprint. He held the indoor world record in the 400-meter sprint, having broken Michael Johnson's mark in 2005.
Me'Lisa Barber is an American sprinter. After graduating from University of South Carolina, she was the 2005 USA Outdoor Champion in the 100 metres and the 2006 World Indoor Champion in the 60 metres. She was also one of the 2003 World Champions in the 4 × 400 metres relay and one of the 2005 World Champions in the 4 × 100 metres relay.
Monique Hennagan is an American athlete who mainly competes in the 400 metres. She won her first relay medal at the 1999 World Indoor Championships and her second in 2003.
Nicola Clare Sanders is a former British track and field sprinter. She began her career as a 400 metres hurdles specialist before concentrating on the 400 metres from 2006 onwards. Her 400 metres personal best is 49.65 seconds. She holds the British indoor record with 50.02 seconds, which ranks her as the fifth fastest woman of all-time indoors.
Jeremy Porter Linn is an American former competition swimmer, Olympic medalist, world record-holder and current swim coach. Linn set an American record in the 100-meter breaststroke while winning the silver medal in that event at the 1996 Summer Olympics in Atlanta, in a time of 1:00.77. With a burst of speed in the final stretch, he finished just .12 seconds behind the gold medal winner from Belgium who had previously set the World Record.
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.
Tiffany Williams is an American hurdler who is a former US 400m hurdles champion in 2007 and 2008.
LaShawn Merritt is an American track and field athlete who competes in sprinting events, specializing in the 400 metres. He is a former Olympic champion over the distance and his personal best of 43.65 seconds makes him the ninth fastest of all time.
Michael Mathieu is a retired Bahamian sprinter from Freeport, Grand Bahama who specialized in the 200 metres and 400 metres. He was part of the Bahamian silver medal-winning team in the men's 4×400 metres relay at the 2008 Beijing Olympics, running second leg and recording a 44.0 split, and the gold medal-winning team at the 2012 Summer Olympics. He was also a part of second place relay team at the 2007 World Championships. He won the bronze medal in the 4x400 metres relay in the 2016 Summer Olympics.
Claudio Licciardello is a track and field sprinter from Italy, who specializes in the 400 metres. His personal best time is 45.25 seconds, achieved in the heats at the 2008 Olympics in Beijing.
Marcus Rowland is an American sprinter who specialises in the 100 and 200 metres. He attended Auburn University and took part in the 2009 Pan American Junior Athletics Championships in Port-of-Spain, where he won a gold medal over 100 metres in 10.03 seconds, which as of April 2017 is the sixth-fastest ever run by a junior athlete.
Muizat Ajoke Odumosu Alademerin is a Nigerian track and field athlete who specialises in the 400 metres and the 400 metres hurdles. She represented Nigeria at the 2008 and 2012 Summer Olympics and competed at the World Championships in Athletics in 2007, 2009, 2011 and 2013. She was the bronze medallist at the 2007 All-Africa Games and went on to become the continental champion with a win at the 2008 and 2012 African Championships.
Ismail Al-Sabiani is a Saudi Arabian track and field athlete who specialises in the 400 metres.
Raphael Fernandes is a Brazilian track and field athlete who competes in the 400 metres hurdles. His personal best for the event is 49.29 seconds, set in 2007. He represented his country at the 2007 World Championships in Athletics.
Warren Weir is a retired Jamaican sprinter, who specialized in the 200 metres. He was the bronze medallist in the event at the 2012 London Olympics, helping Jamaica sweep the medals. In 2013 at the Moscow World Championships, Warren Weir won the silver medal equalling his personal best. He finished behind Usain Bolt who set a World Leading time. His personal best is 19.79 seconds set at the National Stadium in his home country Kingston, Jamaica. He has since equalled his personal best in Moscow, in the World Championship final. He trained with the Glen Mills-coached Racers Track Club, alongside Usain Bolt and Yohan Blake.
Adolphus "Dolly" Jones is a Kittitian and Nevisian track and field athlete and soccer player.
Matthew Hudson-Smith is a British track and field sprinter who specialises in the 400 metres. He holds, as of August 2023, the British and European record, running a personal best of 44.26 seconds for the distance set at the Budapest World Championships in 2023. He was the 2018 European Champion in 400 metres, and a member of the gold-winning teams in the 4 x 400 metre relay at the 2014 European Athletics Championships, with Great Britain and 2014 Commonwealth Games with England.
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.
Nethaneel Joseph Mitchell-Blake is a British sprinter who specialises in the 200 metres. He was the 2013 European Junior Champion and his personal best of 19.95 seconds ranks him as the second-fastest in Britain of all-time in the event. He is only the second Briton, after Adam Gemili to break both 10 seconds for 100 metres and 20 seconds for 200 metres. Part of the Great Britain 4 x 100-metre relay team that won the World title in 2017, he won his first major individual honour, a silver medal, in the individual 200 metres at the 2018 European Athletics Championships before claiming another relay title running for Great Britain, the eventual gold medalists, in the heats of the 4 x 100 metres.On 18 February 2022 it was announced that Nethaneel and his teammates CJ Ujah, Zharnel Hughes and Richard Kilty would be stripped of their 4 × 100 metres relay 2020 Summer Olympics silver medals after the Court of Arbitration for Sport found CJ Ujah guilty of a doping violation.
Botswana 
