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 | 56.06 | Rome, Italy | July 27, 2009 | |
| Pan American Games record | 59.21 | Rio de Janeiro, Brazil | July 18, 2007 |
Qualification
Each National Olympic Committee was able to enter up to two entrants providing they had met the A standard in the qualifying period. NOCs were also permitted to enter one athlete providing they had met the B standard 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 | 58.59 | QA, GR | |
| 2 | 1 | 4 | Elaine Breeden | 59.23 | QA | |
| 3 | 2 | 4 | Daynara de Paula | 1:00.25 | QA | |
| 4 | 1 | 5 | Carolina Colorado | 1:01.06 | QA | |
| 5 | 2 | 3 | Rita Medrano | 1:01.39 | QA | |
| 6 | 3 | 1 | Alia Atkinson | 1:01.41 | QA | |
| 7 | 2 | 5 | Erin Miller | 1:01.58 | QA | |
| 8 | 1 | 3 | Erika Torellas | 1:01.82 | QA | |
| 9 | 1 | 6 | Alana Dillette | 1:02.32 | QB | |
| 10 | 3 | 5 | Gabriella Silva | 1:02.86 | QB | |
| 11 | 3 | 6 | Elimar Barrios | 1:03.25 | QB | |
| 12 | 3 | 2 | Cecilia Bertoncello | 1:03.31 | QB | |
| 13 | 1 | 2 | Melisa Mexia | 1:03.40 | QB | |
| 14 | 3 | 3 | Samantha Corea | 1:04.14 | QB | |
| 15 | 2 | 1 | Karen Torrez | 1:04.28 | QB | |
| 16 | 2 | 2 | Debra Rodriguez | 1:04.29 | QB | |
| 17 | 2 | 7 | Marie Meza Peraza | 1:04.78 | ||
| 18 | 2 | 6 | Barbara Caraballo | 1:05.23 | ||
| 19 | 1 | 7 | Yumisleisy Morales | 1:05.64 | ||
| 20 | 3 | 7 | Oriele Espinoza | 1:06.16 | ||
| 21 | 1 | 1 | Julimar Avila | 1:06.86 | ||
| 22 | 3 | 8 | Lara Butler | 1:08.34 | ||
| 23 | 2 | 8 | Dalia Massiel Torres | 1:08.65 |
B Final
The B final was also held on October 15.| Rank | Lane | Name | Nationality | Time | Notes |
| 9 | 7 | Samantha Corea | 1:02.38 | ||
| 10 | 4 | Alana Dillette | 1:02.51 | ||
| 11 | 3 | Elimar Barrios | 1:02.54 | ||
| 12 | 6 | Cecilia Bertoncello | 1:02.56 | ||
| 13 | 2 | Melisa Mexia | 1:03.62 | ||
| 14 | 8 | Debra Rodriguez | 1:03.63 | ||
| 15 | 1 | Karen Torrez | 1:03.78 | ||
| 16 | 5 | Lara Butler | 1:06.97 |
Final A
The final was also held on October 15.| Rank | Lane | Name | Nationality | Time | Notes |
| 4 | Claire Donahue | 58.73 | |||
| 3 | Daynara de Paula | 59.30 | |||
| 5 | Elaine Breeden | 59.81 | |||
| 4 | 1 | Erin Miller | 1:00.49 | ||
| 5 | 2 | Rita Medrano | 1:00.75 | ||
| 6 | 6 | Carolina Colorado | 1:01.11 | ||
| 7 | 7 | Alia Atkinson | 1:01.17 | ||
| 8 | 8 | Erika Torellas | 1:01.56 |