Swimming at the 2013 World Aquatics Championships – Men's 400 metre individual medley

The men's 400 metre individual medley event in swimming at the 2013 World Aquatics Championships took place on 4 August at the Palau Sant Jordi in Barcelona, Spain.

Records
Prior to this competition, the existing world and championship records were:

Heats
The heats were held at 10:00.

Final
The final was held at 18:15.