Swimming at the 2015 Pan American Games – Men's 100 metre freestyle

The men's 100 metre freestyle competition of the swimming events at the 2015 Pan American Games took place on July 14 at the CIBC Pan Am/Parapan Am Aquatics Centre and Field House in Toronto, Canada. The defending Pan American Games champion was César Cielo Filho of Brazil.

This race consisted of two lengths of the pool, both lengths in freestyle. The top eight swimmers from the heats would qualify for the A final (where the medals would be awarded), while the next best eight swimmers would qualify for the B final.

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 A standard (50.05) in the qualifying period (January 1, 2014 to May 1, 2015). NOCs were also permitted to enter one athlete providing they had met the B standard (53.05) in the same qualifying period. All other competing athletes were entered as universality spots.

Schedule
All times are Eastern Time Zone (UTC-4).

Heats
The first round was held on July 14.

B Final
The B final was also held on July 14.

A Final
The A final was also held on July 14.