| - from - nations|
| August 10 (preliminaries and finals)|
Indiana University Natatorium, Center Township, Indiana, United States
Indiana University Natatorium
The Men's 100 metre butterfly competition of the swimming events at the 1987 Pan American Games took place on 10 August at the Indiana University Natatorium. The last Pan American Games champion was Matt Gribble of US.
This race consisted of two lengths of the pool, all in butterfly.
Swimming at the 1987 Pan American Games – Men's 100 metre butterfly Wikipedia
All times are in minutes and seconds.
The final was held on August 10.