Swimming at the 2011 World Aquatics Championships – Men's 4 × 100 metre medley relay

The men's 4 × 100 metre medley relay competition of the swimming events at the 2011 World Aquatics Championships took place July 31. The heats and final took place July 31.

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

Heats
17 teams participated in 3 heats.

Final
The final was held at 19:38.