Swimming at the 1975 Pan American Games – Men's 100 metre backstroke

The men's 100 metre backstroke competition of the swimming events at the 1975 Pan American Games took place on 19 October. The last Pan American Games champion was Mel Nash of US.

This race consisted of two lengths of the pool, all in backstroke.

Results
All times are in minutes and seconds.

Final
The final was held on October 19.