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.
Thailand competed at the 2000 Summer Olympics in Sydney, Australia.
Thailand competed at the 1992 Summer Olympics in Barcelona, Spain.
Kimberly Ann Linehan is an American former competition swimmer, world champion, and former world record-holder.
The 12th FINA World Swimming Championships (25m) were held in Doha, Qatar on 3–7 December 2014. The Hamad Aquatic Centre in the Aspire Zone hosted the event.
? Nycticebus linglom is a fossil strepsirrhine primate from the Miocene of Thailand. Known only from a single tooth, an upper third molar, it is thought to be related to the living slow lorises, but the material is not sufficient to assign the species to Nycticebus with certainty, and the species name therefore uses open nomenclature. With a width of 1.82 mm, this tooth is very small for a primate. It is triangular in shape, supported by a single root, and shows three main cusps, in addition to various crests. The absence of a fourth cusp, the hypocone, distinguishes it from various other prosimian primates.
Wassana Winatho, also known as Amornrat Winatho and Vassanee Vinatho, is a Thai track and field athlete who specialises in the heptathlon and the 400 metres hurdles. She represented Thailand at the 2008 Summer Olympics and competed at five consecutive editions of the Asian Games.
Natthanan Junkrajang is a Thai swimmer. At the 2008 Summer Olympics, she competed in the women's 100 and 200 m freestyle events. She competed at the 2012 Summer Olympics in the Women's 200 and 400 metre freestyle events, finishing 30th in the 200 m heats and 29th in the 400 m heats, failing to qualify for the final.
At the 2001 SEA Games, the athletics events were held in Kuala Lumpur, Malaysia. A total of 46 events were contested, of which 24 by male and 22 by female athletes. The track and field events were hosted at the National Stadium, Bukit Jalil, the marathons were held around Merdeka Square, and the racewalking events took place at Titiwangsa Lake Gardens.
The 2016 European Aquatics Championships took place from 9 to 22 May 2016 in London, United Kingdom, in the London Aquatics Centre. It was the thirty second edition of the event, and the second held in the same year as a Summer Olympics. Hosts Great Britain headed the medal table for the second successive event; although their swimming return was slightly down, partly down to a small number of star names resting prior to Rio, the gap was made up by an outstanding performance in the diving pool.
Thailand Cultural Centre MRT station is a Bangkok MRT station on the Blue Line in Bangkok, Thailand. It is located under Ratchadaphisek Road, near Thailand Cultural Centre and Stock Exchange of Thailand and MRT depot. During construction, the station had been named Thiam Ruam Mit.
The men's 400 metres event at the 2014 World Junior Championships in Athletics was held in Eugene, Oregon, USA, at Hayward Field on 22, 23 and 24 July.
Swimming at the 2015 World Aquatics Championships was held between 2 and 9 August 2015 in Kazan, Russia. The United States won the overall medal count, led by Katie Ledecky who claimed five gold medals.
At the 1997 Pan Arab Games, the athletics events were held at the Camille Chamoun Sports City Stadium in Beirut, Lebanon from 14 to 17 July. The events were poorly attended, with the vast majority of seat in the stadium remaining empty even on the final day. However, the calibre of performances remained high in spite of this.
Shamier Little is an American track and field sprinter specializing in the 400 metres hurdles. As a 20-year-old college sophomore at Texas A&M University, Little was the 2015 US champion. She then went on to win the silver medal in her signature event at the 2015 and 2023 World Championships. In July 2021, she became the fifth fastest woman of all time at the event.
Amalie Hammild Iuel is a Danish-Norwegian hurdler. She represented Norway in the women's 400 metres hurdles at the 2015 World Championships in Athletics, but was eliminated in the heats.
The swimming competitions at the 2017 SEA Games in Kuala Lumpur took place at National Aquatic Centre in Bukit Jalil. It was one of four aquatic sports at the games, along with diving, water polo, and synchronised swimming. Meanwhile, marathon swimming was held at the Putrajaya Lake.
Pongsakorn Paeyo is a Thai wheelchair racer in the T53 classification. Paeyo represented Thailand at the 2016 and 2020 Summer Paralympics.
Thailand competed at the 2020 Summer Paralympics from 24 August to 5 September 2021. This was the country's tenth appearance at the Paralympic Games.
The following table is an overview of national records in the 400 metres.
