Swimming at the 2011 World Aquatics Championships – Women's 400 metre individual medley

The women's 400 metre individual medley competition of the swimming events at the 2011 World Aquatics Championships was held on July 31 with the heats the final.

Records
Prior to the competition, the existing world and championship records were as follows.

Heats
36 swimmers participated in 5 heats.

Final
The final was held at 19:19.