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

The women's 4x100 metre medley relay event at the 11th FINA World Swimming Championships (25m) took place 14 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 | United States | Natalie Coughlin (55.97) Rebecca Soni (1:02.91) Dana Vollmer (55.36) Missy Franklin (51.32) | 3:45.56 | Atlanta | 16 December 2011 |
| Championship record | China | Zhao Jing (56.52) Zhao Jin (1:04.20) Liu Zige (55.80) Tang Yi (51.77) | 3:48.29 | Dubai | 17 December 2010 |
No new records were set during this competition.

## Results
### Heats

18 teams participated in 2 heats.
| Rank | Heat | Lane | Nation | Swimmers | Time | Notes |
| 1 | 1 | 1 | Denmark | Mie Nielsen (57.59) Rikke Møller Pedersen (1:04.40) Jeanette Ottesen (57.42) Pernille Blume (53.69) | 3:53.10 | Q, NR |
| 2 | 2 | 4 | United States | Olivia Smoliga (58.05) Laura Sogar (1:04.43) Christine Magnuson (57.31) Lia Neal (53.38) | 3:53.17 | Q |
| 3 | 1 | 5 | Japan | Marie Kamimura (58.83) Kanako Watanabe (1:05.58) Nao Kobayashi (57.03) Miki Uchida (52.97) | 3:54.41 | Q, NR |
| 4 | 2 | 8 | Great Britain | Georgia Davies (58.57) Sophie Allen (1:06.04) Jemma Lowe (57.14) Francesca Halsall (52.75) | 3:54.50 | Q |
| 5 | 2 | 9 | China | Fu Yuanhui (58.99) Sun Ye (1:05.56) Jiao Liuyang (56.64) Wang Haibin (53.33) | 3:54.52 | Q |
| 6 | 1 | 8 | Italy | Arianna Barbieri (57.94) Chiara Boggiatto (1:07.23) Ilaria Bianchi (56.75) Federica Pellegrini (53.74) | 3:55.66 | Q, NR |
| 7 | 2 | 5 | Germany | Jenny Mensing (59.50) Caroline Ruhnau (1:06.45) Paulina Schmiedel (58.49) Britta Steffen (52.70) | 3:57.14 | Q, NR |
| 8 | 1 | 4 | Australia | Grace Loh (58.79) Samantha Marshall (1:06.08) Brianna Throssell (58.81) Sally Foster (53.68) | 3:57.36 | Q |
| 9 | 2 | 1 | Canada | Chantal van Landeghem (59.87) Tera van Beilen (1:06.04) Noemie It-Ting Thomas (57.50) Heather MacLean (54.08) | 3:57.49 | |
| 10 | 2 | 2 | Brazil | Fabíola Molina (59.19) Beatriz Travalon (1:07.46) Daynara de Paula (57.69) Larissa Oliveira (53.32) | 3:57.66 | SA |
| 11 | 2 | 3 | Russia | Polina Lapshina (59.31) Valentina Artemyeva (1:05.97) Daria Tcvetkova (1:00.01) Veronika Popova (52.75) | 3:58.04 | |
| 12 | 2 | 0 | Spain | Duane Da Rocha (58.31) Marina García Urzainqui (1:07.55) Judit Ignacio Sorribes (58.34) Melanie Costa (54.22) | 3:58.42 | NR |
| 13 | 1 | 3 | Sweden | Michelle Coleman (59.52) Rebecca Ejdervik (1:07.04) Louise Hansson (58.67) Sandra Hafström (55.21) | 4:00.44 | |
| 14 | 1 | 6 | Finland | Hanna-Maria Seppälä (1:01.45) Jenna Laukkanen (1:06.50) Sini Kuutamo (1:00.51) Emilia Pikkarainen (54.71) | 4:03.17 | NR |
| 15 | 1 | 2 | South Africa | Jessica Ashley-Cooper (59.62) Jessica Pengelly (1:10.67) Marne Erasmus (59.47) Lehesta Kemp (55.10) | 4:04.86 | |
| 16 | 2 | 7 | Macau | Vong Erica Man Wai (1:05.16) Lei On Kei (1:12.26) Kuan Weng I (1:05.39) Tan Chi Yan (1:00.71) | 4:23.52 | NR |
| 17 | 1 | 7 | Pakistan | Lianna Catherine Swan (1:09.82) Anum Bandey (1:23.25) Kiran Khan (1:09.02) Mahnoor Maqsood (1:14.70) | 4:56.79 | |
| | 2 | 6 | Turkey | Hazal Sarıkaya (1:01.72) Dilara Buse Günaydın (1:08.53) İris Rosenberger Esra Kübra Kaçmaz | DSQ | |
| | 1 | 0 | Venezuela | | DNS | |

### Final

The final was held at 21:16.
| Rank | Lane | Nation | Swimmers | Time | Notes |
| | 4 | Denmark | Mie Nielsen (56.73/NR) Rikke Møller Pedersen (1:03.48) Jeanette Ottesen (56.49) Pernille Blume (53.17) | 3:49.87 | ER |
| | 8 | Australia | Rachel Goh (58.16) Sarah Katsoulis (1:03.89) Marieke Guehrer (56.36) Angie Bainbridge (52.47) | 3:50.88 | |
| | 5 | United States | Olivia Smoliga (57.25) Jessica Hardy (1:04.61) Claire Donahue (57.67) Megan Romano (51.90) | 3:51.43 | |
| 4 | 6 | Great Britain | Georgia Davies (57.45) Sophie Allen (1:05.90) Jemma Lowe (56.51) Francesca Halsall (51.99) | 3:51.85 | NR |
| 5 | 2 | China | Zhou Yanxin (57.85) Sun Ye (1:05.89) Lu Ying (56.36) Tang Yi (52.43) | 3:52.53 | |
| 6 | 3 | Japan | Marie Kamimura (59.17) Kanako Watanabe (1:05.15) Nao Kobayashi (57.30) Haruka Ueda (53.11) | 3:54.73 | |
| 7 | 7 | Italy | Arianna Barbieri (58.25) Chiara Boggiatto (1:07.60) Ilaria Bianchi (56.14) Federica Pellegrini (54.13) | 3:56.12 | |
| 8 | 1 | Germany | Jenny Mensing (59.90) Caroline Ruhnau (1:06.24) Paulina Schmiedel (58.31) Britta Steffen (52.40) | 3:56.85 | NR |