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

The men's 400 metre individual medley competition of the swimming events at the 2023 Pan American Games were held on October 24, 2023, at the Aquatic Center in Santiago, Chile.

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

Heats
The first round was held on October 24.

Final B
The B final was also held on October 24.

Final A
The A final was also held on October 24.