Jeremy Matthew Wariner is a retired American track athlete specializing in the 400 meters. He has won four Olympic medals and six World Championships medals. He is the fourth fastest competitor in the history of the 400 m event with a personal best of 43.45 seconds, behind Wayde van Niekerk, Michael Johnson and Butch Reynolds and the fifth fastest all-time mark when he set it in 2007.
Panama competed at the 2004 Summer Olympics in Athens, Greece, from 13 to 29 August 2004. This was the nation's fourteenth appearance at the Olympics since its debut in 1920. This team consisted of two people, a man and a woman. Panama did not compete on four occasions, including the 1980 Summer Olympics in Moscow, because of its partial support of the United States boycott.
Angelo F. Taylor is an American track and field athlete, winner of 400-meter hurdles at the 2000 and 2008 Summer Olympics. His personal record for the hurdles event is 47.25 seconds. His time puts him in a tie with Félix Sánchez for the #14 performer of all time. Sánchez also won two Olympic gold medals, in 2004 between Taylor's two golds and 2012, immediately following. Taylor also has a 400-meter dash best of 44.05 seconds, ranking him as the #25 performer of all time, superior to any other athlete who has made a serious effort in the 400 metres hurdles. He won the bronze medal in the 400 m at the 2007 World Championships in Athletics.
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.
Sandra Glover is an American former track and field athlete who competed in the 400-meter hurdles. She was a medalist in that event at the World Championships in Athletics in 2003 (silver) and 2005 (bronze). She also represented her country at the 2000 Summer Olympics. She was the national champion at the USA Outdoor Track and Field Championships for four consecutive years from 1999 to 2002. She had five victories on the IAAF Golden League circuit during her career.
Marek Plawgo is a Polish athlete. He mainly competes in the 400 meters hurdles, but he also starts in the 400 meters and the 4 x 400 meters relay.
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.
Eronilde Nunes de Araújo is a Brazilian former athlete who specialized in 400 metres hurdles. He dominated athletic events on the South American scene during the 1990s. His personal best of 48.04 seconds was also the South American record until it was broken by Bayano Kamani. He represented his country three times at the Olympics.
Andrea Melissa Blackett is a Barbadian athlete who specializes in the 400 metres hurdles. She is also a women's track assistant coach at her alma mater, Rice University.
Sandra Marie Farmer-Patrick is a Jamaican-born American former athlete who competed mainly in the 400 metres hurdles. She won silver medals in that event at the 1992 Olympic Games in Barcelona, and at the 1993 World Championships in Stuttgart. She also won the 400 metres hurdles at the World Cup in 1989 and 1992. Her best time for the event of 52.79 seconds (1993), is the former U.S record. That performance once ranked her second on the world all-time list, and as of 2018, ranks her 12th on the world all-time list.
Anna Marta Jesień, née Olichwierczuk is a Polish former hurdler.
The men's 400 metres hurdles at the 2008 Summer Olympics took place on 16–18 August at the Beijing National Stadium. There were 26 competitors from 19 nations. The event was won by Angelo Taylor of the United States, the nation's 18th victory in the men's 400 metres hurdles. Taylor was the seventh man to win multiple medals in the event, and third to win two golds. The United States completed its fifth podium sweep in the men's long hurdles, as Kerron Clement and Bershawn Jackson took silver and bronze.
Melaine Walker O.D is a Jamaican 400 metres hurdler. She was born in Kingston. Walker is the former Olympic 400 m hurdles champion. She held the Olympic record of 52.64, set at the 2008 Beijing Olympics, and her time of 52.42 seconds at the 2009 World Championships in Berlin was the second fastest time in history at the time.
The 15th Pan American Games were held in Rio de Janeiro, Brazil from 13 July 2007 to 29 July 2007. Panama competed with a total number of 70 athletes in 12 sports.
Satomi Kubokura is a Japanese track and field athlete who competes in the 200 metres, the 400 metres and the 400 m hurdles.
Zuzana Hejnová is a retired Czech athlete who specialised in the 400 metres hurdles. She won the silver medal in the event at the 2012 London Olympics. Hejnová is a two-time World Champion, having claimed titles at the 2013 and 2015 World Championships in Athletics. She won bronze at the 2012 European Championships and silver for the 400 metres at the 2017 European Indoor Championships.
Phara Anacharsis is a French athlete who specializes in the 400 metres and the 400 metres hurdles.
The men's 400 metres hurdles event at the 2005 World Championships in Athletics was held at the Helsinki Olympic Stadium on August 6, 7 and 9.
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.
Alison Brendom Alves dos Santos is a Brazilian athlete specialising in the 400 metres hurdles. He is a bronze medalist at the 2020 Olympic Games, the 2022 World Champion and the third fastest athlete in the history of the event, in addition to being a gold medalist in the 2019 Pan American Games. Dos Santos is currently the South American and Pan American record holder in the competition.
United States 
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