Athletics at the 2024 Summer Olympics – Women's 400 metres

The women's 400 metres at the 2024 Summer Olympics is scheduled to be held in four rounds at the Stade de France in Paris, France, between 5 and 9 August 2024. This will be the sixteenth time that the women's 400 metres is contested at the Summer Olympics. A total of 48 athletes will be able to qualify for the event by entry standard or ranking.

Background
The women's 400 metres has been present on the Olympic athletics programme since 1964. Reigning Olympic champion Shaunae Miller-Uibo will not be able to defend her Olympic titles from 2016 and 2020, as an injury forced her to withdraw from the Bahamian Olympic trials, thus not allowing her to qualify individually for these games.

Qualification
For the women's 400 metres event, the qualification period is between 1 July 2023 and 30 June 2024. 48 athletes are able to qualify for the event, with a maximum of three athletes per nation, by running the entry standard of 50.95 seconds or faster or by their World Athletics Ranking for this event.

Heats
The heats are scheduled to be held on 5 August, starting at 11:55 (UTC+2) in the morning. 48 athletes qualified for the first round by qualification time or world ranking.

Repechage round
The repechage round is scheduled to be held on 6 August, starting at 11:20 (UTC+2) in the morning.

Semi-finals
The semi-finals are scheduled to be held on 7 August, starting at 20:45 (UTC+2) in the evening.

Final
The final is scheduled to be held on 9 August, starting at 21:40 (UTC+2) in the evening.