The men's 400 metres at the 2004 Summer Olympics as part of the athletics program were held at the Athens Olympic Stadium from August 20 to 23. Sixty-two athletes from 48 nations competed. The event was won by Jeremy Wariner of the United States, the sixth in what would ultimately be 7 consecutive American victories stretching from 1984 to 2008 and the 18th overall title in the event by the United States. The United States swept the podium for the 4th time in the event.
The men's 400 metres hurdles at the 2004 Summer Olympics as part of the athletics program were held at the Athens Olympic Stadium from August 23 to 26. There were 35 competitors from 24 nations. The event was won by Félix Sánchez of the Dominican Republic, the nation's first medal in the men's 400 metres hurdles. Silver went to Danny McFarlane of Jamaica, returning to the podium in the event for the first time since 1992. Naman Keïta's bronze was France's first medal in the event in over 100 years; the last Frenchman to medal in the long hurdles was Henri Tauzin in 1900. The United States' five-Games gold medal streak ended; for only the second time in the history of the event, Americans competed but won no medals.
The women's 400 metres hurdles at the 2004 Summer Olympics as part of the athletics program were held at the Athens Olympic Stadium from August 21 to 25.
The men's 400 metres hurdles was an event at the 1996 Summer Olympics in Atlanta, Georgia. There were 55 competitors from 35 nations. The maximum number of athletes per nation had been set at 3 since the 1930 Olympic Congress. The event was won by Derrick Adkins of the United States, the nation's fourth consecutive and 16th overall victory in the event. Samuel Matete of Zambia earned that nation's first medal in the event with his silver. American Calvin Davis took bronze.
The men's 400 metres hurdles at the 1980 Summer Olympics in Moscow, Soviet Union had a start list of 22 competitors from 19 nations, with three quarterfinals, two semifinals (16), and a final (8) that took place on Saturday July 26, 1980. The maximum number of athletes per nation had been set at 3 since the 1930 Olympic Congress. The event was won by Volker Beck of East Germany, the nation's first medal in the event. Vasyl Arkhypenko earned silver, the second consecutive Games that the Soviet Union reached the podium in the event. Gary Oakes put Great Britain back on the podium after a one-Games absence with his bronze.
The women's 400 metres hurdles competition at the 2012 Summer Olympics in London, United Kingdom was held at the Olympic Stadium on 5–8 August.
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.
The men's 400 metres hurdles at the 2018 European Athletics Championships took place at the Olympic Stadium on 6, 7 and 9 August.
The women's 400 metres hurdles at the 2018 European Athletics Championships takes place at the Olympic Stadium on 7, 8 and 10 August.
The women's 400 metres at the 2022 European Athletics Championships took place in three rounds at the Olympiastadion in Munich, Germany, from 15 to 17 August 2022.
The women's 400 metres hurdles at the 2022 European Athletics Championships took place in three rounds at the Olympiastadion in Munich, Germany, from 17 to 19 August 2022.
The men's 200 metres at the 2024 European Athletics Championships took place at the Stadio Olimpico on 9 and 10 June.
The men's 400 metres at the 2024 European Athletics Championships took place at the Stadio Olimpico from 8 to 10 June.
The men's 110 metres hurdles at the 2024 European Athletics Championships took place at the Stadio Olimpico on 7 and 8 June.
The women's 100 metres at the 2024 European Athletics Championships took place at the Stadio Olimpico on 8 and 9 June.
The women's 400 metres at the 2024 European Athletics Championships took place at the Stadio Olimpico in Rome, Italy from 8 to 10 June 2024.
The women's 100 metres hurdles at the 2024 European Athletics Championships took place at the Stadio Olimpico on 7 and 8 June.
The women's 400 metres hurdles at the 2024 European Athletics Championships took place in three rounds at the Stadio Olimpico in Rome, Italy, from 9 to 11 June 2024. This was the sixteenth time that the women's 400 metres hurdles was contested at the European Athletics Championships. A total of 37 athletes qualified for the event by entry standard, ranking, or wild card. The startlists contained 35 athletes from 21 nations.
The women's 400 metres hurdles at the 2024 Summer Olympics was held in four rounds at the Stade de France in Paris, France, from 4 to 8 August 2024. This was the eleventh time that the women's 400 metres hurdles was contested at the Summer Olympics. A total of 40 athletes were able to qualify for the event by entry standard or ranking.
The men's 400 metres hurdles at the 2024 Summer Olympics was held in four rounds at the Stade de France in Paris, France, from 5 to 9 August 2024. This was 28th time that the men's 400 metres hurdles was contested at the Summer Olympics. A total of 40 athletes were able to qualify for the event by entry standard or ranking.
