| 400 metres at the Olympic Games | |
|---|---|
 The 2012 Olympic men's 400 m final | |
| Overview | |
| Sport | Athletics |
| Gender | Men and women |
| Years held | Men: 1896 – 2020 Women: 1964 – 2020 |
| Olympic record | |
| Men | 43.03 Wayde van Niekerk (2016) |
| Women | 48.25 Marie-José Pérec (1996) |
| Reigning champion | |
| Men |  Steven Gardiner (BAH) |
| Women | Shaunae Miller-Uibo (BAH) |
The 400 metres at the Summer Olympics has been contested since the first edition of the multi-sport event. The men's 400 m has been present on the Olympic athletics programme since 1896 but nearly seventy years passed before the introduction of the women's 400 m, which has been held continuously since the 1964 Games. It is the most prestigious 400 m race at elite level. The competition format typically has two qualifying rounds leading to a final race between eight athletes.
The Olympic record for the men's race was set in 2016, and the record for the women's race was set in 1996. Wayde van Niekerk holds the men's record of 43.03 seconds, breaking world and Olympic records that had been held by Michael Johnson since 1999 and 1996 respectively. Marie-José Pérec is the women's record holder at 48.25 seconds. The men's world record has been broken several times at the Olympics: in 1912, 1932, 1960, 1968, and 2016. Irena Szewińska is the only person to break the women's world record at the competition, doing so in 1976.
Only three athletes have won the event twice: Marie-José Pérec became the first to defend the title in 1996, then Michael Johnson followed with victories in 1996 and 2000, and Shaunae Miller-Uibo successfully defended her 2016 title at Tokyo 2020. No athlete has won more than three medals. Several medalists in the event have also had success in the 200 metres at the Olympics: Johnson, Perec, Szewińska and Valerie Brisco-Hooks have all won titles at both distances. Athletes chosen for the event almost always form part of their nation's team for the 4×400 metres relay at the Olympics.
The United States is the most successful nation in the event, with 21 gold medals and 44 medals in total. The next most successful nation is Great Britain. The 1908 men's 400 metres saw the only walkover in Olympic history, as the American finalists refused to compete in the final in protest of the officiating.[1]
