The men's 100 metre freestyle competition of the swimming events at the 1987 Pan American Games took place on 11 August at the Indiana University Natatorium.

[1] The defending Pan American Games champion was Rowdy Gaines of the United States.

[2][3][4][5][6][7] This race consisted of two lengths of the pool, both lengths being in freestyle.

[8] All times are in minutes and seconds.

The final was held on August 11.