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.
Bertland "Bert" Cameron is a retired Jamaican sprinter who mainly competed over 400 metres. He represented Jamaica at three consecutive editions of the Summer Olympics. Cameron won the 400 m title at the first World Championships in Athletics. He was also the 1982 Commonwealth Games champion in the event and won a number of gold medals at regional competitions. He helped the Jamaican runners to a silver medal in the 4×400 metres relay at the 1988 Seoul Olympics.
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.
Amantle Montsho is a female sprinter from Botswana who specializes in the 400 metres. She represented her country at the 2004 and 2008 Summer Olympics, reaching the final at the latter edition. She was the first woman to represent Botswana at the Olympics. She has also competed at the World Championships in Athletics and the IAAF World Indoor Championships, and is the former World Champion over the 400m, winning in a personal best time of 49.56 in Daegu.
John Bryan Bronson is an American 400-meter hurdler, who won the bronze medal at the 1997 World Championships in Athens. He also represented his country at the 1996 Summer Olympics. He won three consecutive titles at the USA Outdoor Track and Field Championships from 1996 to 1998.
Rose Tata-Muya is a retired runner from Kenya who specialised mainly in the 400m hurdles. She won medals at the continental level and competed at the Olympics, World Championships and Commonwealth Games.
Muizat Ajoke Odumosu Alademerin is a Nigerian track and field athlete who specialises in the 400 metres and the 400 metres hurdles. She represented Nigeria at the 2008 and 2012 Summer Olympics and competed at the World Championships in Athletics in 2007, 2009, 2011 and 2013. She was the bronze medallist at the 2007 All-Africa Games and went on to become the continental champion with a win at the 2008 and 2012 African Championships.
Raphael Fernandes is a Brazilian track and field athlete who competes in the 400 metres hurdles. His personal best for the event is 49.29 seconds, set in 2007. He represented his country at the 2007 World Championships in Athletics.
Cornel Edwin Fredericks is a South African track and field athlete who competes in the 400 metres hurdles. His personal best for the event is 48.14 seconds.
María Princesa Oliveros Bohórquez is a Colombian track and field athlete who competes in the 100 metres hurdles and 400 metres hurdles events. Her personal bests are 13.41 seconds and 56.26 seconds, respectively. She was the gold medallist in the 400 m hurdles at the 2011 Pan American Games, at which she also won a 4×400 metres relay bronze medal in a Colombian record time.
Ali Khamis Abbas Ali Khamis is a Bahraini track and field athlete who competes mainly in the 400 metres sprint and 400 metres hurdles. His personal best for the flat event is 44.36 seconds, set in 2013, while his hurdles best is 49.55 seconds, set in 2014. He was the 2014 Asian Games champion in the hurdles and the runner-up in the sprint at the 2013 Asian Athletics Championships
Garry Brown is an Australian former track and field athlete who specialised in the 400 metres hurdles. He was the champion in that event at the 1982 Commonwealth Games after winning two minor medals at the 1978 Commonwealth Games. His personal best of 49.37 seconds was set as part of his Commonwealth win.
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.
Leleith Hodges is a Jamaican former track and field sprinter who competed mainly in the 100 metres. She was one of Jamaica's most prominent female runners of the 1970s.
Emi Akimoto is a Japanese former track and field athlete who specialised in the 100 metres hurdles. She was the gold medallist in the event at the Asian Athletics Championships three times consecutively from 1979 to 1983, breaking the championship record each time. She won two gold medals at the Asian Games in 1982, running in the hurdles and 4×100 metres relay.
Takashi Nagao is a Japanese former track and field athlete who competed in the 400 metres hurdles. He was the gold medallist at the 1982 Asian Games and the 1981 Asian Athletics Championships, as well as runner-up at those tournaments in 1978 and 1979.
Noel Stanley Clough was an Australian track and field athlete who competed in the 400 metres, 800 metres, and 400 metres hurdles.
Sam Turner is an American male former track and field hurdler who competed in both the 110-meter hurdles and 400-meter hurdles.
The 1978 UK Athletics Championships was the national championship in outdoor track and field for the United Kingdom held at Meadowbank Stadium, Edinburgh.
The West African Athletics Championships is an international athletics competition between West African nations, organised by the Confederation of African Athletics (CAA).
Kenya 
