Swimming at the 1979 Pan American Games – Men's 100 metre butterfly
# Swimming at the 1979 Pan American Games – Men's 100 metre butterfly

The men's 100 metre butterfly competition of the swimming events at the 1979 Pan American Games took place on 7 July at the Piscina Olimpica Del Escambron. The last Pan American Games champion was Mike Curington 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 |
| - | - | - | - | - | - | - | - | - | - | - | - | - |

### Heats

The first round was held on July 7.

| Rank | Name | Nationality | Time | Notes |
| - | - | - | - | - |
| 1 | Robert Placak | United States | 55.88 | Q |
| 2 | Dan Thompson | Canada | 55.94 | Q |
| 3 | Clay Evans | Canada | 56.34 | Q |
| 4 | Jorge Jaramillo | Colombia | 57.51 | Q |
| 5 | David McCagg | United States | 57.93 | Q |
| 6 | Caio Filardi | Brazil | 58.12 | Q |
| 7 | Arnaldo Pérez | Puerto Rico | 58.34 | Q |
| 8 | Leonardo Gamez | Mexico | 58.57 | Q |
| 9 | Filiberto Colon | Puerto Rico | 59.12 | |
| 10 | Daniel Garimaldi | Argentina | 59.17 | NR |
| 11 | Rafael Vidal | Venezuela | 59.23 | NR |
| 12 | Claudio Lutotovich | Argentina | 1:00.12 | |
| 13 | David Lindquist | U.S. Virgin Islands | 1:00.22 | NR |
| 14 | Roberto Ledesma | Ecuador | 1:00.66 | |
| 15 | Miguel Oqueli | El Salvador | 1:02.40 | |
| 16 | Ruben Martinez | El Salvador | 1:03.71 | |
| 17 | Jordy Masalles | Dominican Republic | 1:03.79 | |
| 18 | Bobby Peterson | U.S. Virgin Islands | 1:04.06 | |
| 19 | Donaldo Clough | Dominican Republic | 1:04.36 | |

### Final

The final was held on July 7.

| Rank | Name | Nationality | Time | Notes |
| - | - | - | - | - |
| | Robert Placak | United States | 55.54 | NR, GR |
| | Dan Thompson | Canada | 55.56 | |
| | Clay Evans | Canada | 56.63 | |
| 4 | David McCagg | United States | 56.90 | |
| 5 | Jorge Jaramillo | Colombia | 57.79 | |
| 6 | Caio Filardi | Brazil | 57.85 | |
| 7 | Leonardo Gamez | Mexico | 58.25 | NR |
| 8 | Arnaldo Pérez | Puerto Rico | 58.42 | |
