Swimming at the 2011 World Aquatics Championships – Men's 400 metre freestyle

The men's 400 metre freestyle competition of the swimming events at the 2011 World Aquatics Championships took place July 24. The heats and final took place on July 24.

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

Heats
49 swimmers participated in 7 heats, qualified swimmers are listed:

Final
The final was held at 18:13.