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.
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.
Tamsyn Carolyn Lewis is an Australian media personality and former track and field athlete who won a total of eighteen Australian Championships across the 400 metres, 800 metres and 400m hurdles. She first represented Australia in 1994, and won the 800 metres in the 2008 World Indoor Championships.
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.
LaShawn Merritt is a retired American track and field athlete who competed in sprinting events, specializing in the 400 metres. He is a former Olympic champion over the distance and his personal best of 43.65 seconds makes him the eleventh fastest of all time.
Christopher Clarke is an English elite athlete sprinter who has often represented Great Britain and Northern Ireland. At club level he represents Marshall Milton Keynes AC and is also higher claim to Newham and Essex Beagles A.C.
Rabah Mahhamed Yousif Bkheit is a Sudanese-born British track and field athlete, who initially competed for Sudan before obtaining British citizenship.
Machel Cedenio is a Trinidadian sprinter specialising in the 400 metres. He represented his country at two outdoor and one indoor World Championships winning a silver medal in the relay at the 2015 outdoor edition. He competed at the 2016 Summer Olympics. He qualified for the final and came fourth with a new personal best of 44.01 seconds. This is the fastest fourth place time for the 400 metres.
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.
Nijel Carlos Amilfitano Amos is a Botswana middle-distance runner who competes in the 800 metres. He won the silver medal at the 2012 London Olympics, which was Botswana's first-ever Olympic medal. Amos claimed gold medals at the 2014 Commonwealth Games and 2015 All-Africa Games. At the African Championships in Athletics, he took golds in 2014, 2016 and 2018.
Desirèe Henry is an English sprinter who competes in the 100 metres and 200 metres. She won an Olympic silver medal in the women's 4 x 100 metres relay at the 2024 Summer Olympics in Paris, the bronze medal in the 4 x 100 metres relay at the 2016 Rio Games, and a silver medal in the 4 × 100 m relay at the 2017 World Athletics Championships in London.
Athletics at the 2016 Summer Olympics were held during the last 10 days of the games, from 12 to 21 August 2016, at the Olympic Stadium. The sport of athletics at the 2016 Summer Olympics was made into three distinct sets of events: track and field events, road running events, and racewalking events.
Amel Tuka is a Bosnian middle-distance runner who competes in the 800 metres. His achievements include a silver medal at the 2019 World Championships as well as a bronze medal at the 2015 World Championships. Tuka holds national records in the 400 m and 800 m disciplines.
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 August 2024, the British and European record, running a personal best of 43.44 seconds for the distance at the 2024 Summer Olympics. 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.
The men's 400 metres event at the 2016 Summer Olympics took place between 12 and 14 August at the Olympic Stadium. Fifty-three athletes from 35 nations competed. The event was won by 0.73 seconds by Wayde van Niekerk of South Africa, who broke the world record and won the nation's second gold medal in the men's 400 metres. Kirani James of Grenada and LaShawn Merritt of the United States became the sixth and seventh men to win two medals in the event, but Michael Johnson remained the only man with two gold medals.
The men's 4 × 400 metres relay competition at the 2016 Summer Olympics in Rio de Janeiro, Brazil was held at the Estádio Olímpico João Havelange on 19–20 August.
Baboloki Tirelo Thebe is a Botswana track and field sprinter who specialises in the 400 metres. He was a silver medallist in the 200 metres at the 2014 Summer Youth Olympics. He reached the semi-finals at the 2014 World Junior Championships in Athletics. He made a breakthrough in the 400 m in May 2016 with a run of 44.22 seconds, placing him third on the global seasonal lists and moving him into the all-time top 30 for the event. He competed at the 2016 Summer Olympics. His personal best in 400 meters is 44.02, which he ran in July 2017
Lesotho sent a delegation to compete at the 2016 Summer Paralympics in Rio de Janeiro, Brazil, from 7 to 18 September 2016. This was the fifth time the country competed in the Summer Paralympic Games after it made its debut sixteen years prior at the 2000 Sydney Paralympics. The delegation to Rio de Janeiro consisted of two athletes: sprinter Sello Mothebe and discus thrower Litsitso Khotele. Mothebe originally came third in the heats of the men's 200 metres T12 and the men's 400 metres T12 events but he was retroactively disqualified for testing positive for a banned substance. Khotele ranked tenth in the women's discus throw F43–44 competition with a throw of 19.91 metres.
The men's 400 metres event at the 2020 Summer Olympics took place between 1 and 5 August 2021 at the Olympic Stadium. Approximately fifty athletes were expected to compete; the exact number was dependent on how many nations use universality places to enter athletes in addition to the 48 qualifying through time or ranking. 48 athletes from 33 nations competed. The event was won by 0.23 seconds by Steven Gardiner of the Bahamas, with Anthony Zambrano of Colombia taking silver. Those were the first medals in the men's 400 metres for each of those two nations. Kirani James of Grenada won his third consecutive medal in the event with his bronze, making him the first man to earn three medals in the 400 metres.
Botswana 
