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.
Mokgadi Caster Semenya OIB is a South African middle-distance runner and winner of two Olympic gold medals and three World Championships in the women's 800 metres. She first won gold at the World Championships in 2009 and went on to win at the 2016 Olympics and the 2017 World Championships, where she also won a bronze medal in the 1500 metres. After the doping disqualification of Mariya Savinova, she was also awarded gold medals for the 2011 World Championships and the 2012 Olympics.
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.
Diego Armando Palomeque Echavarría is a Colombian sprinter.
In India, the sport of athletics was introduced during the period of the British Raj. The sport is governed at national level by the Athletics Federation of India, which was formed in 1946. Despite its large population, few Indian athletes have won a medal in a global or major championship. This began to change in the 21st century, when Indians started taking greater interest in athletics more generally and improved facilities for the sport began to be built at a local level. At a continental level, it has been among the more successful Asian nations, though some distance behind China and Japan.
Francine Niyonsaba is a Burundian runner who specialized in the 800 metres and shifted to longer distances in 2019. She was the 2016 Rio Olympics silver medalist in the women's 800 metres. Her silver medal was the first Olympic medal for Burundi since 1996. Niyonsaba won a silver in the event at the 2017 World Championships.
Dutee Chand is an Indian professional sprinter and current national champion in the women's 100 metres event. She is the first Indian to win a gold medal in 100m race in a global competition. She is the third Indian woman to ever qualify for the Women's 100 metres event at the Summer Olympic Games. However, in the 2016 Summer Olympics, her 11.69 s in the preliminary round did not qualify her for the next round. In 2018, Chand clinched silver in women's 100m at the Jakarta Asian Games. It was India's first medal in this event since 1998. In 2019, she became the first Indian sprinter to win gold at the Universiade, clocking 11.32 seconds in the 100 m race.
Elaine Sandra-Lee Thompson-Herah OD is a Jamaican sprinter who competes in the 60 metres, 100 metres and 200 metres. Regarded as one of the greatest sprinters of all time, she is a five-time Olympic champion, the fastest woman alive in the 100 m, and the second fastest alive in the 200 m.
Margaret Vanessa Barrie is a Sierra Leonean sprinter. She competed in the women's 400 metres at the 2017 World Championships in Athletics. In 2019, she competed in the women's 200 metres and women's 4 × 400 metres relay at the 2019 African Games held in Rabat, Morocco.
Maximila Imali is a Kenyan sprinter. She competed in the women's 400 metres at the 2017 World Championships in Athletics. In 2019, she won the bronze medal in the women's 4 × 100 metres relay at the 2019 African Games held in Rabat, Morocco. Imali is among the athletes to shift from competing in the 400m and 800m to the 100m and 200m due to World Athletics' regulations on testosterone levels for athletes with XY disorders of sex development in women's competition.
Lada Vondrová is a Czech track and field athlete who specializes in sprint races. She won several Czech national titles.
The women's 200 metres event at the 2020 Summer Olympics took place on 2 and 3 August 2021 at the Japan National Stadium. 41 athletes from 31 nations competed. In successfully defending her title, Elaine Thompson-Herah became the first woman in history to win both the 100 and 200 metres titles at successive games. Her winning time of 21.53 secs, moved her to second on the world all-time list behind Florence Griffith Joyner, and broke Merlene Ottey's 30-year-old Jamaican record.
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 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.
Sarah Chelangat is a Ugandan track and field athlete who specializes in long-distance running. She represented Uganda at the 2019 World Athletics Championships, competing in women's 5000 metres.
The testosterone regulations in women's athletics are a series of policies first published in 2011 by the IAAF and last updated following a court victory against Caster Semenya in May 2019. The first version of the rules applied to all women with high testosterone, but the current version of the rules only apply to athletes with certain XY disorders of sexual development, and set a 5 nmol/L testosterone limit, which applies only to distances between 400 m and 1 mile (inclusive), other events being unrestricted.
Anna Cockrell is an American track and field athlete competing in sprinting and hurdling. She is a two-time medalist at the 2019 Pan American Games in Lima, Peru and she represented the United States at the 2020 Summer Olympics in Tokyo, Japan.
Beatrice Masilingi is a Namibian sprinter. At the age of 18, she placed sixth in the 200 metres at the 2020 Tokyo Olympics, having made the final along with fellow Namibian sprinter and eventual silver medallist Christine Mboma. Masilingi won silver medals in both the 100 metres and 200 m at the 2021 World Under-20 Championships.
Christine Mboma is a Namibian sprinter who competes in the 100 metres and 200 m. At the age of 18, she won a silver medal in the 200 metres at the 2020 Tokyo Olympics, becoming the first ever Namibian woman to win a women's Olympic medal and breaking the world under-20 and African senior record. Mboma also won the event at the 2021 World Under-20 Championships and Diamond League final, improving her record mark to 21.78 seconds.
The women's 200 metres at the 2022 World Athletics Championships was held at the Hayward Field in Eugene, Oregon, U.S. from 18 to 21 July 2022.
