The men's 100 metre freestyle competition of the swimming events at the 1959 Pan American Games took place on 31 August (preliminaires)[1][2] and 2 September (finals).

[3] The last Pan American Games champion was Clarke Scholes of US.

[9] All times are in minutes and seconds.

The first round was held on August 31.

[1] The final was held on September 2.