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

The Women's 100 metre freestyle swimming event at the 2011 Pan American Games was held on October 19, 2011, in Guadalajara, Mexico. The defending Pan American Games champion was Arlene Semeco of Venezuela.
This race consisted of two lengths of the pool, both in freestyle.

## Records

Prior to this competition, the existing world and Pan American Games records were as follows:
| World Record | Britta Steffen (GER) | 52.07 | Rome, Italy | July 31, 2009 |
| Games Record | Amanda Weir (USA) | 54.46 | Santo Domingo, Dominican Republic | August 11, 2003 |

## Qualification

Each National Olympic Committee (NOC) was able to enter up to two entrants providing they had met the A standard (57.6) 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 (59.3) in the same qualifying period.

## 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 October 19.
| Rank | Heat | Lane | Name | Nationality | Time | Notes |
| 1 | 1 | 4 | Amanda Kendall | United States | 54.82 | QA |
| 2 | 2 | 4 | Vanessa García | Puerto Rico | 55.73 | QA |
| 3 | 3 | 5 | Erika Erndl | United States | 55.98 | QA |
| 4 | 2 | 5 | Jennifer Beckberger | Canada | 56.15 | QA |
| 5 | 3 | 4 | Tatiana Barbosa | Brazil | 56.47 | QA |
| 6 | 2 | 6 | Nadia Colovini | Argentina | 56.66 | QA |
| 7 | 3 | 3 | Arlene Semeco | Venezuela | 56.69 | QA |
| 8 | 1 | 3 | Liliana Ibáñez | Mexico | 56.83 | QA |
| 9 | 1 | 5 | Daynara de Paula | Brazil | 57.14 | QB |
| 10 | 2 | 3 | Caroline Lapierre | Canada | 57.43 | QB |
| 11 | 1 | 2 | Ariel Weech | Bahamas | 57.97 | QB |
| 12 | 1 | 6 | Wendy Rodriguez | Venezuela | 58.14 | QB |
| 13 | 2 | 2 | Karen Torrez | Bolivia | 58.81 | QB |
| 14 | 3 | 6 | Chinyere Pigot | Suriname | 58.95 | QB |
| 15 | 1 | 7 | Allyson Ponson | Aruba | 59.59 | QB |
| 16 | 3 | 7 | Karen Riveros | Paraguay | 1:00.11 | QB |
| 17 | 3 | 1 | Julimar Avila | Honduras | 1:00.15 | |
| 18 | 2 | 1 | Marie Meza Peraza | Costa Rica | 1:01.13 | |
| 19 | 1 | 1 | Britany van Lange | Guyana | 1:02.28 | |
| | 3 | 2 | Fernanda González | Mexico | | DNS |
| | 2 | 7 | Kendese Nangle | Jamaica | | DNS |

### B Final

The B final was also held on October 19.
| Rank | Lane | Name | Nationality | Time |
| 9 | 5 | Ariel Weech | Bahamas | 57.58 |
| 10 | 4 | Caroline Lapierre | Canada | 57.70 |
| 11 | 3 | Wendy Rodriguez | Venezuela | 58.03 |
| 12 | 6 | Karen Torrez | Bolivia | 58.84 |
| 13 | 2 | Chinyere Pigot | Suriname | 59.03 |
| 14 | 7 | Allyson Ponson | Aruba | 59.16 |
| 15 | 1 | Karen Riveros | Paraguay | 59.96 |
| 16 | 8 | Julimar Avila | Honduras | 1:00.51 |

### A Final

The A final was also held on October 19.
| Place | Lane | Swimmer | Nation | Time | Notes |
| | 4 | Amanda Kendall | United States | 54.75 | |
| | 3 | Erika Erndl | United States | 55.04 | |
| | 1 | Arlene Semeco | Venezuela | 55.43 | |
| 4 | 5 | Vanessa García | Puerto Rico | 55.55 | |
| 5 | 6 | Jennifer Beckberger | Canada | 55.68 | |
| 6 | 8 | Liliana Ibáñez | Mexico | 55.74 | NR |
| 7 | 2 | Tatiana Barbosa | Brazil | 56.36 | |
| 8 | 7 | Nadia Colovini | Argentina | 56.53 | |