Stephanie Louise Rice, OAM is an Australian former competitive swimmer. She won three gold medals at the 2008 Summer Olympics in Beijing, and was awarded the Medal of the Order of Australia on 26 January 2009.
Martyn Joseph Rooney is an English sprinter who specialises in the 400 metres event. He reached the 400 m final at the 2008 Summer Olympics and won bronze in the 4×400 metres relay. A mainstay on the anchor leg of the Great Britain and England 4 x 400 metre relay teams, at the 2009 World Championships in Athletics he won a silver medal with the Great Britain relay team, and bronze in the 2015 and 2017 World Championships.
Laurent Ottoz is an Italian hurdler. He won four medals, at senior level, at international athletics competitions.
Rabah Mahhamed Yousif Bkheit is a Sudanese-born British track and field athlete, who initially competed for Sudan before obtaining British citizenship.
Kirani James is a Grenadian professional sprinter who specializes in the 400 metres. He won the 400 m at the World Championships in 2011, and the 2012 London Olympics. In the 400 metres, James also won the silver medal at the 2016 Rio Olympics, and bronze medal at the 2020 Tokyo Olympics, thus becoming the first man to earn the full set of three medals in the centennial history of the event. He is Grenada's first and only Olympic medalist. He holds the Grenadian national record in both the 200 metres and 400 metres.
Matteo Galvan is an Italian athlete who specializes in the 200 and 400 metres. His career highlight so far is the 2009 European Indoor Championships, where he placed sixth in the 400 metres and won a gold medal in the relay.
Yousef Ahmed Masrahi is a Saudi Arabian track and field athlete, who specialises in the 400 metres sprint. His personal best time for the event is 43.93 seconds, set in 2015, and is the Asian record.
Pavel Maslák is a Czech sprinter who specialises in the 200 metres and 400 metres. He is the only athlete in history who has won the 400 m title at the World Indoor Championships at three consecutive championships. Maslák is the first Czech to have run 400 metres under 45 seconds outdoor and under 46 seconds indoor.
Lalonde Keida Gordon, HBM is a Tobagonian male track and field sprinter who specialises in the 400 metres. He won the bronze medal at the 2012 London Olympics with a personal best of 44.52 seconds. He is the third fastest 400 m runner from his country after Machel Cedenio and Ian Morris.
Shaunae Miller-Uibo is a Bahamian track and field sprinter who competes in the 200 and 400 metres. She is a two-time Olympic champion after winning the women's 400 metres at the 2016 Rio Olympics and again at the 2020 Tokyo Olympics.
Lauren Boden is an Australian athletics competitor. Her events are the 400 metre hurdles, 400 metres and long jump. She was the youngest woman to win the 400 metres hurdle event at the Australian national championships. She has competed in the long jump event and the 400 metres hurdle event at the World University Games. She has competed at the 2006 and 2010 Commonwealth Games and the 2012 and 2016 Summer Olympics in the 400 metre hurdles event.
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.
Karsten Warholm is a Norwegian sprinter who competes in the 400 metres and 400 m hurdles. He is the 2020 Tokyo Olympic champion, a three-time world champion and the world record holder in the latter event.
Jermaine Brown is a Jamaican track and field sprinter. He competes in distances from 60 metres to 400 metres. He has a 200 metres best of 20.29 seconds and a 400 m best of 46.24 seconds. He mainly competes internationally in relay competitions.
Yasmani Copello Escobar is a Cuban-born track and field hurdler who represents Turkey internationally. His personal best for the 400 metres hurdles is 47.81 seconds, set in the final of the 2018 European Athletics Championships in Berlin.
Wayde van Niekerk is a South African track and field sprinter who competes in the 200 and 400 metres. In the 400 metres, he is the current world and Olympic record holder, having set the record when he won the event at the 2016 Olympics.
Matthew Hudson-Smith is a British track and field sprinter who specialises in the 400 metres. He holds, as of July 2024, the British and European record, running a personal best of 43.74 seconds for the distance at the London Diamond League. 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.
Ali Khamis Abbas Ali Khamis is a Bahraini track and field athlete who competes mainly in the 400 metres sprint and 400 metres hurdles. His personal best for the flat event is 44.36 seconds, set in 2013, while his hurdles best is 49.55 seconds, set in 2014. He was the 2014 Asian Games champion in the hurdles and the runner-up in the sprint at the 2013 Asian Athletics Championships
Sebastian William Gregory "Seb, Chaps," Rodger is a British athlete specialising in the 400 metres hurdles. In 2013, he won a silver medal at the European U23 Championships and reached the semifinals of the World Championships. He also represented Great Britain at the 2016 Olympic Games in Rio de Janeiro, Brazil but only got a participation medal.
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.
Algeria 
