Swimming at the 2019 World Aquatics Championships – Men's 4 × 100 metre freestyle relay

The Men's 4 × 100 metre freestyle relay competition at the 2019 World Championships was held on 21 July 2019.

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

The following new records were set during this competition.

Heats
The heats were held at 12:32.

Final
The final was held at 21:23.