# Swimming at the 2011 Pan American Games – Women's 4 × 100 metre medley relay

The Women's 4×100 Medley Relay Swimming event at the XVI Pan American Games was swum on 21 October 2011 in Guadalajara, Mexico.
The defending champion in the event was the United States.

## Records

Prior to this competition, the existing world and Pan American Games records were as follows:
| World record | China (CHN) Zhao Jing (58.98) Chen Huijia (1:04.12) Jiao Liuyang (56.28) Li Zhesi (52.81) | 3:52.19 | Rome, Italy | August 1, 2009 |
| Pan American Games record | United States (USA) Julia Smit (1:01.94) Michelle McKeehan (1:08.59) Kathleen Hersey (58.57) Maritza Correia (55.50) | 4:04.60 | Rio de Janeiro, Brazil | July 22, 2007 |

## Results

Key: q= qualified for finals; GR= Games Record; NR= national record.

### Preliminary heats

| Rank | Heat/Lane | Nation | Swimmers | Time | Notes |
| 1 | H2 L4 | United States | Elizabeth Pelton (1:00.71) Ashley Wanland (1:09.15) Elaine Breeden (59.88) Erika Erndl (54.78) | 4:04.52 | Q, GR |
| 2 | H1 L5 | Brazil | Fabíola Molina (1:02.93) Tatiane Sakemi (1:13.75) Daynara de Paula (1:00.60) Tatiana Lemos (58.25) | 4:15.53 | Q |
| 3 | H1 L4 | Canada | Samantha Corea (1:04.11) Kierra Smith (1:11.46) Brenna MacLean (1:02.85) Caroline Lapierre (57.31) | 4:15.73 | Q |
| 4 | H2 L5 | Mexico | Lourdes Villaseñor (1:05.62) Melissa Rodríguez (1:11.83) Rita Medrano (1:02.75) Liliana Ibáñez (59.12) | 4:19.32 | Q |
| 5 | H2 L3 | Venezuela | Elimar Barrios (1:06.65) Mercedes Toledo (1:12.45) Eliana Barrios (1:03.68) Wendy Rodriguez (58.07) | 4:20.85 | Q |
| 6 | H2 L6 | Bahamas | Alana Dillette (1:04.48) Alicia Lightbourne (1:14.56) Mckayla Lightbourn (1:04.83) Ariel Weech (59.17) | 4:23.04 | Q |
| 7 | H1 L3 | Argentina | Florencia Perotti (1:05.23) Julia Sebastian (1:13.42) Georgina Bardach (1:06.65) Nadia Colovini (1:02.13) | 4:27.43 | Q |
| 8 | H1 L6 | Puerto Rico | Alana Berrocal (1:06.08) Patricia Casellas (1:15.92) Debra Rodriguez (1:08.72) Barbara Caraballo (1:03.93) | 4:34.65 | Q |
| 9 | H2 L2 | Peru | Andrea Cedron (1:10.71) Patricia Quevedo (1:19.55) Daniela Kaori Miyahara (1:09.39) Mariangela Macchiavello (59.62) | 4:39.27 | |

### Final

| Rank | Lane | Nation | Swimmers | Time | Notes |
| | 4 | United States | Rachel Bootsma (1:00.46) Annie Chandler (1:07.59) Claire Donahue (59.03) Amanda Kendall (53.92) | 4:01.00 | GR |
| | 5 | Canada | Gabrielle Soucisse (1:02.70) Ashley McGregor (1:08.80) Erin Miller (1:00.32) Jennifer Beckberger (55.22) | 4:07.04 | |
| | 6 | Brazil | Fabíola Molina (1:01.07) Tatiane Sakemi (1:11.40) Daynara de Paula (59.32) Tatiana Lemos (55.33) | 4:07.12 | |
| 4 | 7 | Mexico | Fernanda González (1:01.83) Arantxa Medina (1:11.00) Rita Medrano (1:00.29) Liliana Ibáñez (56.29) | 4:09.41 | |
| 5 | 3 | Argentina | Florencia Perotti (1:04.88) Julia Sebastian (1:11.44) Cecilia Bertoncello (1:06.17) Nadia Colovini (53.69) | 4:16.18 | |
| 6 | 1 | Bahamas | McKayla Lightbourn (1:03.95) Alicia Lightbourne (1:13.54) Alana Dillete (1:01.36) Ariel Weech (58.12) | 4:16.97 | |
| 7 | 8 | Venezuela | Jeserik Pinto (1:05.48) Daniela Victoria (1:13.47) Erika Torellas (1:02.13) Arlene Semeco (57.68) | 4:18.76 | |
| 8 | 2 | Puerto Rico | Alana Berrocal (1:06.13) Trysha Centeno (1:12.27) Barbara Caraballo (1:05.02) Debra Rodriguez (59.74) | 4:23.16 | |