The 400 metres, or 400-meter dash, is a sprint event in track and field competitions. It has been featured in the athletics programme at the Summer Olympics since 1896 for men and since 1964 for women. On a standard outdoor running track, it is one lap around the track. Runners start in staggered positions and race in separate lanes for the entire course. In many countries, athletes previously competed in the 440-yard dash (402.336 m)—which is a quarter of a mile and was referred to as the "quarter-mile"—instead of the 400 m (437.445 yards), though this distance is now obsolete.
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.
Salwa Eid Naser is a Nigerian-born Bahraini sprinter who specialises in the 400 metres. She was the 2019 World champion with the third fastest time in history of 48.14 seconds, becoming the youngest-ever champion in the event and also the first woman representing an Asian nation to win that event at a World Championships. The mark places her only behind contested results of Marita Koch and Jarmila Kratochvílová. Over the distance, at only 19, Naser was the 2017 World silver medallist. She has also won, as a member of the Bahraini mixed-gender 4x400 m relay team, the 2019 World Championships bronze medal.
The women's 400 metres at the 2017 World Championships in Athletics was held at the London Olympic Stadium on 6−7 and 9 August.
Natalia Kaczmarek is a Polish sprinter who specialises in the 400 metres. She is the 2024 European champion as well as the European silver medalist from 2022. She also won the bronze medal at the 2024 Summer Olympics. Kaczmarek earned several global medals as part of 4 x 400 m relays, including gold in the mixed event and silver in the women's event at the 2020 Tokyo Olympics.
Rhasidat Adeleke is an Irish sprinter.
The women's 400 metres event at the 2020 Summer Olympics took place from 3 to 6 August 2021 at the Japan National Stadium. 45 athletes from 34 nations competed. Shaunae Miller-Uibo won the gold medal by 0.84 seconds in a personal best of 48.36 secs, a time which ranks her sixth on the world all-time list. In successfully defending her title, Miller-Uibo joined Marie-Jose Perec as the only women to win two Olympic 400 metres titles.
The women's 400 metres at the 2019 World Athletics Championships was held at the Khalifa International Stadium in Doha, Qatar, from 30 September to 3 October 2019.
Marileidy Paulino is a Dominican athlete sprinter specializing in the 400 meters. She won the silver medal at the 2020 Tokyo Olympics, becoming the first woman from the Dominican Republic to earn an individual Olympic medal in athletics. At the subsequent Summer Olympics in Paris, she won the gold medal in the 400 metres event, becoming only the third person from the Dominican Republic to win an Olympic gold medal. Paulino also took silver at the 2022 World Athletics Championships. At these competitions, she also earned silver and gold in the mixed 4×400 m relay respectively, running legs of 48.7 s in 2021 and 48.47 s in 2022. Since May 2023, Paulino is the 400 m ranked world No. 1.
Lieke Klaver is a Dutch track and field athlete who competes in sprinting. She specializes in the 200 metres and in the 400 metres. In the 4 × 400 metres relay, she is the 2023 World Champion and the 2024 World Indoor Champion with the Dutch women's team and the 2024 Olympic Champion with the Dutch mixed team.
Sharlene Mawdsley is an Irish athlete who specialises in the 400 meters and other sprint events.
The women's 400 metres at the 2022 World Athletics Indoor Championships took place on 18 and 19 March 2022.
The women's 400 metres at the 2022 World Athletics Championships was held at the Hayward Field in Eugene, Oregon, U.S. from 17 to 22 July 2022.
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 at the 2023 World Athletics Championships was held at the National Athletics Centre in Budapest, Hungary from 20 to 23 August 2023. The winning margin was 0.81 seconds which as of 2024 is the only time the women's 400 metres has been won by more than 0.7 seconds at these championships.
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 women's 200 metres at the 2024 Summer Olympics was held in four rounds at the Stade de France in Paris, France, between 4 and 6 August 2024. This was the twentieth time that the women's 200 metres was contested at the Summer Olympics. A total of 48 athletes were able to qualify for the event by entry standard or ranking.
The men's 200 metres at the 2024 Summer Olympics was held in four rounds at the Stade de France in Paris, France, between 5 and 8 August 2024. This was the 29th time that the men's 200 metres was contested at the Summer Olympics. A total of 48 athletes were able to qualify for the event by entry standard or ranking.
The men's 400 metres at the 2024 Summer Olympics was held in four rounds at the Stade de France in Paris, France, between 4-7 August 2024. This was the 30th time that the men's 400 metres was contested at the Summer Olympics. A total of 48 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.
