The men's 100 metre backstroke competition of the swimming events at the 1959 Pan American Games took place on 1 September (preliminaires)[1][2] and 3 September (finals).

[3] The last Pan American Games champion was Frank McKinney of US.

[4][5][6][7][8] This race consisted of two lengths of the pool, all in backstroke.

The first round was held on September 1.

[1] The final was held on September 3.