The women's 400 metre individual medley event at the 2024 World Aquatics Swimming Championships (25 m) was held on 14 December 2024 at the Duna Arena in Budapest, Hungary.
Records.
Prior to the competition, the existing world and championship records were as follows:
The following record was established during the competition:
Results.
Heats.
The heats were started at 9:02.
Final.
The final was held at 18:30.