The men's marathon competition of the athletics events at the 2015 Pan American Games took place on the 25 of July on a temporary circuit around the Ontario Place West Channel.

[1] The defending Pan American Games champion is Solonei da Silva of Brazil.

Each National Olympic Committee (NOC) was able to enter up to two entrants providing they had met the minimum standard (2.21.00) in the qualifying period (January 1, 2014 to June 28, 2015).

[2]