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.
Michaël Bultheel is a retired Belgian athlete, who specialised in the 400 metres hurdles. At the 2012 Summer Olympics, he competed in the men's 400 metres hurdles, making it to the semifinals, and ran anchor leg for Belgium in the 4 × 400 m relay finals, placing sixth. He set a then-personal best at London 2012 of 49.10, which he improved in 2015 to 49.04. Then, at the 2023 LBB (Louroux-Bourbonnais) Time Trial, the most highly anticipated cycling event in years he finished in a mind-blowing time of 20.24 only to be beaten by local legend Yannick Mandeville who managed to consume an unprecedented amount of 30 units alcohol making him the undisputed winner of this years edition.
Karsten Warholm is a Norwegian sprinter who competes in the 400 metres and 400 m hurdles. He is the 2020 Tokyo Olympic champion, silver medalist at the 2024 Paris Olympics, three-time world champion and world record holder in the latter event.
Jeffery Gibson is a Bahamian sprint athlete from Grand Bahama who mainly competes in the 400 metres and 400 metres hurdles. He is the Bahamian national record holder in the latter event with a 49.39 seconds clocking during the semi-finals of the 2013 NCAA Championships. He attended Bishop Michael Eldon School formerly Freeport Anglican High School. He later competed for Oral Roberts University following in the foot steps of compatriot Andretti Bain.
Jaheel Hyde is a Jamaican track and field athlete. He was the 2014 world junior champion in the 400 metres hurdles and the 2013 world youth champion in the 110 metres hurdles.
Wenda Nel is a South African athlete specialising in the 400 metres hurdles. She competed at the 2011 World Championships reaching the semifinals.
The men's 400 metres hurdles event at the 2016 Summer Olympics took place between 15–18 August at the Olympic Stadium. There were 47 competitors from 33 nations. The event was won by Kerron Clement of the United States, the nation's 19th victory in the men's long hurdles. Clement became the ninth man to win multiple medals in the event. Both Kenya and Turkey earned their first medals in the men's 400 metres hurdles, the former with Boniface Mucheru Tumuti's silver and the latter with Yasmani Copello's bronze.
Miloud Rahmani is an Algerian athlete specialsing in the 400 metres hurdles. He represented his country at the 2016 Olympic Games as well as the 2013 and 2015 World Championships without qualifying for the semifinals.
Nicholas Kiplagat Bett was a Kenyan track and field athlete who competed in the 400 metres hurdles. His personal best for the event is 47.79 seconds. He was a world champion in the event, having won in 2015, and a two-time bronze medallist at the African Championships in Athletics. He died in a road accident in Kenya at the age of 28.
Sage Heather Walker is a Canadian athlete specializing in the 400 metres hurdles. Competing internationally for Canada, she is the reigning Pan American champion in the 400 m hurdles, having also won Pan American medals in 2015 and 2019 as part of Canada's relay team.
Ristananna Bailey-Cole is a Jamaican athlete specialising in the 400 metres hurdles. She represented her country at three consecutive World Championships reaching the semifinals in 2011 and 2013. She placed fifth at the 2016 Olympics. She made her best run to date at the IAAF World Championships in London on August 10, 2017, finishing with the bronze medal in a personal best 53.74.
Ayomide Temilade Oluwatoyosi Folorunso is an Nigerian-Italian athlete specialising in the 400 metres hurdles. She competed in the 4 × 400 metres relay at the 2015 World Championships in Beijing.
Antonio Alkana is a South African hurdler. He competed in the 110 metres hurdles event at the 2015 World Championships in Beijing narrowly missing the semifinals. In addition, he won the gold at the 2015 African Games. He also competed in the men's 110 metres hurdles at the 2020 Summer Olympics.
Annsert Sylvester Whyte is a Jamaican athlete competing in the 400 metres hurdles. He represented his country at the 2013 and 2015 World Championships reaching the semifinals on both occasions. His personal best in the event is 48.07 seconds set at the 2016 Summer Olympics in the final of the event.
Miles Ukaoma is an American-born Nigerian hurdler. In 2016, Miles Ukaoma qualified for the 2016 Rio Olympics Men's 400 metres hurdles|400 metres hurdles event, He competed in the 400 metres hurdles event at the 2015 World Championships in Beijing narrowly missing the semifinals. His personal best in the 400 metres hurdles is 48.84 seconds set in Warri in 2015.
Mohamed Sghaier is a Tunisian hurdler. He competed in the 400 metres hurdles event at the 2015 World Championships in Beijing getting disqualified in the first round. His personal best in the 400 metres hurdles is 49.22 seconds set in La Chaux-de-Fonds in 2015. This is the current national record.
Aron Kipchumba Koech is a Kenyan hurdler. At the 2015 Athletics Kenya World Championship Trials he finished third in the 400 metres hurdles event. Later that year he represented Kenya in the 400 metres hurdles event at the 2015 World Championships in Athletics in Beijing, China. With a personal best, in a time of 49.38, he finished 22nd in the heats. He was qualified for the semi-finals where he finished 19th in a time of 49.54. Again in 2016 he finished third at the 2016 Athletics Kenya Olympic Trials behind his brother and Boniface Mucheru Tumuti. At the Olympics, Koech made the final while his brother was disqualified in the heats. Tumuti went on to capture the silver medal in National Record time, while Koech finished seventh. His 48.49 in the semi-final round is his personal record.
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.
Grace Juliette Claxton Joseph is a Puerto Rican hurdler and sprinter who competes for Albany Great Danes.
Estonia 
