Swimming at the 2009 World Aquatics Championships – Men's 4 × 100 metre freestyle relay

The men's 4×100 m freestyle relay at the 2009 World Aquatics Championships took place on 26 July 2009 at the Foro Italico in Rome, Italy.

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

The following records were established during the competition: