Athletics at the 2015 Pan American Games – Men's 400 metres

The men's 400 metres sprint competition of the athletics events at the 2015 Pan American Games will take place between the 22 and 23 of July at the CIBC Pan Am and Parapan Am Athletics Stadium. The defending Pan American Games champion is Nery Brenes of Costa Rica.

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

Qualification
Each National Olympic Committee (NOC) was able to enter up to two entrants providing they had met the minimum standard (46.07) in the qualifying period (January 1, 2014 to June 28, 2015).

Results
All times shown are in seconds.