Swimming at the 2023 Pan American Games – Men's 400 metre freestyle

The men's 400 metre freestyle competition of the swimming events at the 2023 Pan American Games were held on October 21, 2023, at the Aquatic Center in Santiago, Chile.

Records
Prior to this competition, the existing world and Pan American Games records were as follows: The following record was established during the competition:

Heats
The first round was held on October 21.

Final B
The B final was also held on October 21.

Final A
The A final was also held on October 21.