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

The men's 100 metre backstroke competition of the swimming events at the 1991 Pan American Games took place on 17 August. The last Pan American Games champion was Andrew Gill of US.

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

## 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 17.

| Rank | Name | Nationality | Time |
| - | - | - | - |
| | Andrew Gill | United States | 55.79 |
| | Rodolfo Falcón | Cuba | 56.12 |
| | Robert Brewer | United States | 56.39 |
| 4 | Manuel Guzmán | Puerto Rico | 56.67 |
| 5 | Rogério Romero | Brazil | 57.46 |
| 6 | Sebastian Lasave | Argentina | 58.72 |
| 7 | Paul Szekula | Canada | 58.87 |
| 8 | Ricardo Busquets | Puerto Rico | 59.09 |
