The men's 100 metre breaststroke competition of the swimming events at the 1983 Pan American Games took place on 17 August.

[1] The last Pan American Games champion was Steve Lundquist of US.

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

[8] All times are in minutes and seconds.

The final was held on August 17.