| Athletics 400 metres | |
|---|---|
 The closing stages of a men's 400 m race | |
| World records | |
| Men |  Wayde van Niekerk (RSA) 43.03 (2016) |
| Women |  Marita Koch (GDR) 47.60 (1985) |
| Short track world records | |
| Men |  Kerron Clement (USA) 44.57 (2005) |
| Women |  Femke Bol (NED) 49.17 (2024) |
| Olympic records | |
| Men | Wayde van Niekerk (RSA) 43.03 (2016) |
| Women |  Marileidy Paulino (DOM) 48.17 (2024) |
| World Championship records | |
| Men | Michael Johnson (USA) 43.18 (1999) |
| Women | Sydney McLaughlin-Levrone (USA) 47.78 (2025) |
| World junior (U20) records | |
| Men | Steve Lewis (USA) 43.87 (1988) |
| Women |  Grit Breuer (GER) 49.42 (1991) |
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[clarification needed] countries, athletes previously competed in the 440-yard dash (402.336 m)—which is a quarter of a mile (1,760 yards) and was referred to as the "quarter-mile"—instead of the 400 m (437.445 yards), though this distance is now obsolete.
The current men's world record and Olympic record is held by Wayde van Niekerk of South Africa; his time of 43.03 seconds is the fastest ever run in an open 400 m. While Lythe Pillay holds the fastest 400 m relay split with a time of 42.66, relay splits are typically faster because athletes have a running start and do not need to react to the gun if they are not the leadoff leg. Considering van Niekerk's reaction time of 0.181 seconds in his run of 43.03, van Niekerk covered the 400-metre distance itself in 42.85 seconds, therefore being 0.19 seconds slower than Pillay's relay split.
Quincy Hall is the reigning men's Olympic champion. Collen Kebinatshipi is the current men's world champion. Kerron Clement is the men's world indoor record holder with a time of 44.57 seconds. The current women's world record is held by Marita Koch, with a time of 47.60 seconds. Sydney McLaughlin-Levrone is the current women's world champion, holding the championship record of 47.78 seconds. Marileidy Paulino is the women's Olympic champion, and holds the Olympic record in a time of 48.17 seconds. Femke Bol holds the women's world indoor record at 49.17 (2024). The men's T43 Paralympic world record of 45.07 seconds is held by Oscar Pistorius.
An Olympic double of 200 metres and 400 m was first achieved by Valerie Brisco-Hooks in 1984, and later by Marie-José Pérec of France and Michael Johnson from the United States on the same evening in 1996. Alberto Juantorena of Cuba at the 1976 Summer Olympics became the first and so far the only athlete to win both the 400 m and 800 m Olympic titles. Pérec became the first to defend the Olympic title in 1996, Johnson became the first and only man to do so in 2000.
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