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

The men's 400 metres hurdles sprint competition of the athletics events at the 2015 Pan American Games will take place between July 23 and July 24 at the CIBC Pan Am and Parapan Am Athletics Stadium. The defending Pan American Games champion is Omar Cisneros of Cuba.

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 (51.62) in the qualifying period (January 1, 2014 to June 28, 2015).

Results
All times shown are in seconds.