Swimming at the 1983 Pan American Games – Men's 100 metre butterfly
# Swimming at the 1983 Pan American Games – Men's 100 metre butterfly

The men's 100 metre butterfly competition of the swimming events at the 1983 Pan American Games took place on 18 August. The last Pan American Games champion was Robert Placak of US.

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

## Results

All times are in minutes and seconds.

| KEY: | q | Fastest non-qualifiers | Q | Qualified | GR | Games record | NR | National record | PB | Personal best | SB | Seasonal best |
| - | - | - | - | - | - | - | - | - | - | - | - | - |

### Final

The final was held on August 18.

| Rank | Name | Nationality | Time | Notes |
| - | - | - | - | - |
| | Matt Gribble | United States | 54.25 | GR |
| | Pablo Morales | United States | 54.62 | |
| | Rafael Vidal | Venezuela | 54.72 | SA |
| 4 | Tom Ponting | Canada | 55.18 | |
| 5 | Filiberto Colon | Puerto Rico | 56.45 | |
| 6 | Dave Churchill | Canada | 56.88 | |
| 7 | Marcelo Jucá | Brazil | 57.32 | |
| 8 | Ivan Ortiz | Puerto Rico | 58.31 | |
