# Swimming at the 2011 Pan American Games – Women's 100 metre butterfly

The women's 100 metre butterfly competition of the swimming events at the 2011 Pan American Games took place on October 15 at the Scotiabank Aquatics Center in the municipality of Zapopan, near Guadalajara, Mexico. The defending Pan American Games champion was Kathleen Hersey of the United States.
The race consisted of two lengths of the pool, both lengths being in the butterfly stroke.

## Records

Prior to this competition, the existing world and Pan American Games records were as follows:
| World record | Sarah Sjöström (SWE) | 56.06 | Rome, Italy | July 27, 2009 |
| Pan American Games record | Kathleen Hersey (USA) | 59.21 | Rio de Janeiro, Brazil | July 18, 2007 |

## Qualification

Each National Olympic Committee (NOC) was able to enter up to two entrants providing they had met the A standard (1:03.7) in the qualifying period (January 1, 2010 to September 4, 2011). NOCs were also permitted to enter one athlete providing they had met the B standard (1:05.6) in the same qualifying period.

## Results

All times are in minutes and seconds.
| KEY: | q | Fastest non-qualifiers | Q | Qualified | NR | National record | PB | Personal best | SB | Seasonal best | PR | Pan American Games record |

### Heats

The first round was held on October 15.
| Rank | Heat | Lane | Name | Nationality | Time | Notes |
| 1 | 3 | 4 | Claire Donahue | United States | 58.59 | QA, GR |
| 2 | 1 | 4 | Elaine Breeden | United States | 59.23 | QA |
| 3 | 2 | 4 | Daynara de Paula | Brazil | 1:00.25 | QA |
| 4 | 1 | 5 | Carolina Colorado Henao | Colombia | 1:01.06 | QA |
| 5 | 2 | 3 | Rita Medrano | Mexico | 1:01.39 | QA |
| 6 | 3 | 1 | Alia Atkinson | Jamaica | 1:01.41 | QA |
| 7 | 2 | 5 | Erin Miller | Canada | 1:01.58 | QA |
| 8 | 1 | 3 | Erika Torellas | Venezuela | 1:01.82 | QA |
| 9 | 1 | 6 | Alana Dillette | Bahamas | 1:02.32 | QB |
| 10 | 3 | 5 | Gabriella Silva | Brazil | 1:02.86 | QB |
| 11 | 3 | 6 | Elimar Barrios | Venezuela | 1:03.25 | QB |
| 12 | 3 | 2 | Cecilia Bertoncello | Argentina | 1:03.31 | QB |
| 13 | 1 | 2 | Melisa Mexia | Mexico | 1:03.40 | QB |
| 14 | 3 | 3 | Samantha Corea | Canada | 1:04.14 | QB |
| 15 | 2 | 1 | Karen Torrez | Bolivia | 1:04.28 | QB |
| 16 | 2 | 2 | Debra Rodriguez | Puerto Rico | 1:04.29 | QB |
| 17 | 2 | 7 | Marie Meza Peraza | Costa Rica | 1:04.78 | |
| 18 | 2 | 6 | Barbara Caraballo | Puerto Rico | 1:05.23 | |
| 19 | 1 | 7 | Yumisleisy Morales | Cuba | 1:05.64 | |
| 20 | 3 | 7 | Oriele Espinoza | Peru | 1:06.16 | |
| 21 | 1 | 1 | Julimar Avila | Honduras | 1:06.86 | |
| 22 | 3 | 8 | Lara Butler | Cayman Islands | 1:08.34 | |
| 23 | 2 | 8 | Dalia Massiel Torres | Nicaragua | 1:08.65 | |

### B Final

The B final was also held on October 15.
| Rank | Lane | Name | Nationality | Time |
| 9 | 7 | Samantha Corea | Canada | 1:02.38 |
| 10 | 4 | Alana Dillette | Bahamas | 1:02.51 |
| 11 | 3 | Elimar Barrios | Venezuela | 1:02.54 |
| 12 | 6 | Cecilia Bertoncello | Argentina | 1:02.56 |
| 13 | 2 | Melisa Mexia | Mexico | 1:03.62 |
| 14 | 8 | Debra Rodriguez | Puerto Rico | 1:03.63 |
| 15 | 1 | Karen Torrez | Bolivia | 1:03.78 |
| 16 | 5 | Lara Butler | Cayman Islands | 1:06.97 |

### Final A

The final was also held on October 15.
| Rank | Lane | Name | Nationality | Time |
| | 4 | Claire Donahue | United States | 58.73 |
| | 3 | Daynara de Paula | Brazil | 59.30 |
| | 5 | Elaine Breeden | United States | 59.81 |
| 4 | 1 | Erin Miller | Canada | 1:00.49 |
| 5 | 2 | Rita Medrano | Mexico | 1:00.75 |
| 6 | 6 | Carolina Colorado Henao | Colombia | 1:01.11 |
| 7 | 7 | Alia Atkinson | Jamaica | 1:01.17 |
| 8 | 8 | Erika Torellas | Venezuela | 1:01.56 |