The men's 400 metre individual medley competition of the swimming events at the 2019 Pan American Games are scheduled to be held August 9th, 2019 at the Villa Deportiva Nacional Videna cluster.

[1] Prior to this competition, the existing world and Pan American Games records were as follows: The first round will be held on August 9.

[2][3][4][5] The B final was also held on August 9.

[6] The A final was also held on August 9.

[7]