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.
Roger Anthony BlackMBE is an English former athlete who competed internationally for Great Britain and England. During his athletics career, he won individual silver medals in the 400 metres sprint at both the Olympic Games and World Championships, two individual gold medals at the European Championships, and 4 × 400 metres relay gold medals at both the World and European Championships.
Swimming has been a sport at every modern Summer Olympics. It has been open to women since 1912. At the Olympics, swimming has the second-highest number of medal-contested events.
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.
Brigitte Heike Meissner is a retired German athlete. She competed mainly in the 400 metres hurdles, but also spent two seasons specializing in the 800 metres. Notable achievements include a silver medal at the 2002 European Championships, medals in 4 x 400 metres relay at the 1994 European Championships and the 1997 World Indoor Championships and a fourth place at the 1995 World Championships.
Sunday Bada was a Nigerian sprinter who specialized in the 400 metres event. He won three medals at the World Indoor Championships, including a gold medal in 1997. His personal best time was 44.63 seconds, and with 45.51 seconds indoor he holds the African indoor record. He set a national record in the 4 x 400 metres relay at the 2000 Olympics, where the Nigerian team also won gold medals after the disqualification of the US team who had finished first.
Norberto Téllez Santana is a retired Cuban runner.
Neil de Silva is a retired male track and field athlete from Trinidad and Tobago who specialized in the 200 and 400 metres.
Garry Peter Cook is a former British track and field athlete, who competed mainly in the 800 metres with a best time of 1:44.55 minutes.
The Maldives competed at the 1996 Summer Olympics in Atlanta, United States, from 19 July to 4 August 1996. The delegation's participation in the Atlanta Olympics marked the Maldives' third appearance at the Summer Olympics since their debut at the 1988 Summer Olympics in Seoul, South Korea. Six athletes competed across two sports; Mohamed Amir, Naseer Ismail, Hussain Riyaz, Ahmed Shageef and Yaznee Nasheeda in track and field, and Moosa Nazim in swimming. None of the track or swimming athletes advanced past the first round in their events, and no Maldivian has won a medal in any events. Ahmed Shageef bore the Maldives' flag during the parade of nations of the opening ceremony.
Einārs Tupurītis is a retired Latvian middle distance runner who specialized in the 800 metres. He competed in college for Wichita State University.
Linda Staines is a female former British track and field athlete who competed mainly in the 400 metres. She represented Great Britain at the 1988 Olympic Games in Seoul in both the 400 metres and 4 x 400 metres relay, and won a bronze medal in the 4 × 400 m relay at the 1993 World Championships. She also won four medals at the Commonwealth Games, including an individual silver medal in the 400 metres in 1990 and two relay gold medals.
Mireia Belmonte García is a Spanish Olympic, world, and European champion swimmer. She is the world record holder in the short course 200 metre butterfly and 400 metre individual medley. Formerly, she held the world record in the short course 400 metre freestyle, 800 metre freestyle, and 1500 metre freestyle. She was the first Spanish woman to win a gold medal in swimming at an Olympic Games and is widely considered to be the greatest Spanish swimmer of all time.
The Maldives first participated at the Olympic Games in 1988. It has sent athletes to compete in every Summer Olympic Games since, but has not participated in the Winter Olympic Games.
Erasto Kambon Sampson is a retired sprinter from Saint Vincent and the Grenadines who specialized in the 100 metres and 400 metres.
Svetla Stefanova Zlateva is a retired Bulgarian sprinter and middle-distance runner who specialized in the 400 and 800 metres. She is a former world record holder in the latter event. In 1973, she was the winner of the first Balkan Athlete of the Year award.
Lilyana Tomova-Todorova, born 9 August 1946) is a retired Bulgarian sprinter and middle-distance runner who specialized in the 400, 800 and 1500 metres.
Dmitriy Anatolyevich Bogdanov is a Russian middle-distance runner who specializes in the 800 metres. His personal best times are 1:44.33 minutes in the 800 metres and 46.50 seconds in the 400 metres.
Carl Oliver Jr. is a Bahamian former track and field sprinter who specialised in the 400 metres. He is the current secretary of the Bahamas Association of Athletic Associations. His greatest achievements on the track came with the Bahamian 4×400 metres relay team. He was a bronze medallist in the relay at the 2000 Summer Olympics and was also a finalist at the 1996 Atlanta Olympics and the 1999 World Championships in Athletics. He helped set a national record of 3:02.85 minutes at the 1995 World Championships in Athletics.
Nuno Miguel Cerqueira Dias was one of the top Portuguese long distance freestyle swimmers of the 1990s, he broke several national records, achieved multiple national titles, and took part in many international competitions on behalf of the Portuguese national team.
Saint Vincent and the Grenadines 
