Swimming at the 1959 Pan American Games – Women's 100 metre butterfly
# Swimming at the 1959 Pan American Games – Women's 100 metre butterfly

The women's 100 metre butterfly competition of the swimming events at the 1959 Pan American Games took place on 2 September (preliminaries) and 4 September (finals). The last Pan American Games champion was Beth Whittall of Canada.

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 September 2.

| Rank | Heat | Name | Nationality | Time | Notes |
| - | - | - | - | - | - |
| 1 | 2 | Nancy Ramey | United States | 1:09.1 | Q, WR |
| 2 | 1 | Becky Collins | United States | 1:09.6 | Q |
| 3 | 2 | Molly Botkin | United States | 1:11.9 | Q |
| 4 | 1 | Margareth Iwasaki | Canada | 1:15.2 | Q |
| 5 | 1 | Eulália Martinez | Mexico | 1:18.9 | Q |
| 6 | 2 | Elal Jacques | Canada | 1:20.0 | Q |
| 7 | 2 | Mary Stewart | Canada | 1:22.4 | Q |
| 8 | 2 | Miriam Andreu | El Salvador | 1:22.6 | Q |
| - | 2 | Marion Meyer | Brazil | 1:24.6 | |

### Final

The final was held on September 4.

| Rank | Name | Nationality | Time |
| - | - | - | - |
| | Becky Collins | United States | 1:09.5 |
| | Nancy Ramey | United States | 1:10.4 |
| | Molly Botkin | United States | 1:12.3 |
| 4 | Margareth Iwasaki | Canada | 1:14.8 |
| 5 | Eulália Martinez | Mexico | 1:21.2 |
| 6 | Elal Jacques | Canada | 1:22.2 |
| 7 | - | - | - |
| 8 | - | - | - |
