# 2012 FINA World Swimming Championships (25 m) – Women's 4 × 100 metre freestyle relay

The women's 4x100 metre freestyle relay event at the 11th FINA World Swimming Championships (25m) took place 15 December 2012 at the Sinan Erdem Dome.

## Records

Prior to this competition, the existing world and championship records were as follows.
| | Nation | Swimmers | Time | Location | Date |
| World record | Netherlands | Hinkelien Schreuder (52.88) Inge Dekker (52.24) Ranomi Kromowidjojo (52.12) Marleen Veldhuis (50.98) | 3:28.22 | Amsterdam | 19 December 2008 |
| Championship record | Netherlands | Femke Heemskerk (52.33) Inge Dekker (52.47) Hinkelien Schreuder (52.32) Ranomi Kromowidjojo (51.42) | 3:28.54 | Dubai | 18 December 2010 |
No new records were set during this competition.

## Results
### Heats

| Rank | Heat | Lane | Nation | Swimmers | Time | Notes |
| 1 | 2 | 4 | United States | Lia Neal (53.70) Allison Schmitt (53.16) Shannon Vreeland (53.34) Olivia Smoliga (54.07) | 3:34.27 | Q |
| 2 | 1 | 4 | Australia | Sally Foster (53.62) Angie Bainbridge (53.24) Brianna Throssell (54.79) Marieke Guehrer (53.61)| | 3:35.26 | Q |
| 3 | 1 | 1 | Denmark | Mie Nielsen (53.66) Pernille Blume (54.12) Kelly Rasmussen (54.84) Jeanette Ottesen (53.36) | 3:35.98 | Q |
| 4 | 2 | 3 | Brazil | Larissa Oliveira (53.90) Alessandra Marchioro (53.78) Tatiana Lemos (54.21) Flávia Cazziolato (54.47) | 3:36.36 | Q |
| 5 | 2 | 1 | China | Qiu Yuhan (54.22) Guo Junjun (53.79) Liu Xinyi (54.94) Pang Jiaying (54.48) | 3:37.43 | Q |
| 6 | 1 | 5 | Russia | Veronika Popova (53.54) Elena Sokolova (54.19) Vitalina Simonova (54.47) Polina Lapshina (55.42) | 3:37.62 | Q |
| 7 | 2 | 8 | Great Britain | Francesca Halsall (53.91) Rebecca Turner (54.52) Ellie Faulkner (55.05) Elizabeth Simmonds (54.72) | 3:38.20 | Q |
| 8 | 2 | 5 | Japan | Haruka Ueda (53.83) Miki Uchida (54.74) Kanako Watanabe (55.58) Nao Kobayashi (54.60) | 3:38.75 | Q |
| 9 | 1 | 7 | Canada | Chantal van Landeghem (54.83) Heather MacLean (54.51) Noemie It-Ting Thomas (56.06) Katerine Savard (55.39) | 3:40.79 | |
| 10 | 1 | 6 | South Africa | Trudi Maree (54.97) Lehesta Kemp (54.70) Megan Stephens (56.45) Vanessa Mohr (55.68) | 3:41.80 | AF |
| 11 | 1 | 3 | Turkey | Esra Kübra Kaçmaz (56.50) Ilknur Nihan Cakici (57.10) Nilüfer Kuru (58.37) Burcu Dolunay (55.80) | 3:47.77 | NR |
| 12 | 2 | 6 | Singapore | Mylene Ong (56.16) Amanda Lim (57.72) Lynette Ng (58.27) Samantha Yeo (58.42) | 3:50.57 | |
| 13 | 2 | 2 | Macau | Lei On Kei (58.21) Vong Erica Man Wai (58.60) Kuan Weng I (59.21) Tan Chi Yan (58.87) | 3:54.89 | NR |
| 14 | 1 | 2 | Peru | Jessica Cattaneo (59.52) Andrea Cedrón (59.61) Daniela Miyahara (59.93) Oriele Espinoza (1:00.26) | 3:59.32 | |
| 15 | 2 | 7 | Pakistan | Kiran Khan (1:03.74) Anum Bandey (1:07.89) Mahnoor Maqsood (1:11.52) Lianna Catherine Swan (1:02.62) | 4:25.77 | |
| | 1 | 8 | Venezuela | | DNS | |

### Final

The final was held at 20:41.
| Rank | Lane | Nation | Swimmers | Time | Notes |
| | 4 | United States | Megan Romano (52.86) Jessica Hardy (53.32) Lia Neal (52.44) Allison Schmitt (52.39) | 3:31.01 | |
| | 5 | Australia | Angie Bainbridge (53.04) Marieke Guehrer (52.32) Brianna Throssell (54.19) Sally Foster (53.35) | 3:32.90 | |
| | 3 | Denmark | Mie Nielsen (53.07) Pernille Blume (53.61) Kelly Rasmussen (54.59) Jeanette Ottesen (52.24) | 3:33.51 | NR |
| 4 | 2 | China | Qiu Yuhan (54.32) Guo Junjun (54.52) Wang Haibin (53.44) Chen Xinyi (53.94) | 3:36.22 | |
| 5 | 7 | Russia | Veronika Popova (53.60) Elena Sokolova (54.08) Daria Belyakina (54.41) Vitalina Simonova (54.63) | 3:36.72 | |
| 6 | 6 | Brazil | Larissa Oliveira (53.90) Alessandra Marchioro (54.34) Flávia Cazziolato (54.55) Tatiana Lemos (54.26) | 3:37.05 | |
| 7 | 8 | Japan | Haruka Ueda (53.63) Miki Uchida (53.93) Asami Chida (55.44) Nao Kobayashi (55.44) | 3:37.91 | |
| 8 | 1 | Great Britain | Rebecca Turner (54.37) Elizabeth Simmonds (55.00) Ellie Faulkner (54.55) Francesca Halsall (54.31) | 3:38.23 | |