Swimming at the 2023 World Aquatics Championships – Mixed 4 × 100 metre freestyle relay

The mixed 4 × 100 metre freestyle relay competition at the 2023 World Aquatics Championships was held on 29 July 2023.

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

Heats
The heats were started at 11:23.

Final
The final was held at 21:45.