Swimming at the 1991 Pan American Games – Men's 100 metre butterfly
# Swimming at the 1991 Pan American Games – Men's 100 metre butterfly

The men's 100 metre butterfly competition of the swimming events at the 1991 Pan American Games took place on 13 August. The last Pan American Games champion was Anthony Nesty of Suriname.

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 13.

| Rank | Name | Nationality | Time | Notes |
| - | - | - | - | - |
| | Anthony Nesty | Suriname | 53.45 | GR |
| | Mike Merrell | United States | 54.60 | |
| | Eduardo Piccinini | Brazil | 55.00 | |
| 4 | Jim Harvey | United States | 55.04 | |
| 5 | Jose Menéndez | Cuba | 55.84 | |
| 6 | Diego Perdomo | Colombia | 56.02 | |
| 7 | Emmanuel Nascimento | Brazil | 56.17 | |
| 8 | Giovanni Linscheer | Suriname | 56.21 | |
