The women's 4 × 100 metre medley relay event at the 2012 Summer Olympics took place on 3–4 August at the London Aquatics Centre in London, United Kingdom.

The U.S. women's team won to beat a new world record and to reclaim their Olympic title after twelve years. Leading from the start, the foursome of Missy Franklin (58.50), Rebecca Soni (1:04.82), Dana Vollmer (55.48), and Allison Schmitt (53.25) put together a perfect ending with a gold-medal time in 3:52.05 to shave off China's global standard by 14-hundredths of a second from the 2009 World Championships at the peak of the high-tech bodysuit era.

Australia's Emily Seebohm (59.01), Leisel Jones (1:06.06), Alicia Coutts (56.41), and Melanie Schlanger (52.54) trailed behind their formidable rivals by a couple of seconds, but managed to take home a magnificent silver in 3:54.02. Pulling off a second-place finish, Jones also matched Ian Thorpe for the most medals by an Australian swimmer in her fourth straight Olympics with a remarkable overall tally of nine (three golds, five silver, and one bronze).

Japan's Aya Terakawa (58.99), Satomi Suzuki (1:05.96), Yuka Kato (57.36), and Haruka Ueda (53.42) ended on a spectacular fashion with a bronze medal in 3:55.73, holding off the robust Russian quartet of Anastasia Zuyeva (59.13), Yuliya Yefimova (1:04.98), Irina Bespalova (58.59), and Veronika Popova (53.33) by exactly three-tenths of a second (0.30), a fourth-place time in 3:56.03.

Outside the podium, China's Zhao Jing (59.86), Ji Liping (1:06.94), Lu Ying (56.80), and Tang Yi (52.81) could not produce a similar stellar performance in the medley relay with a fifth-place finish in 3:56.41, while the Dutch foursome of Sharon van Rouwendaal (1:00.72), Moniek Nijhuis (1:06.74), Inge Dekker (56.91), and star Ranomi Kromowidjojo (52.91), who captured another sprint freestyle title an hour earlier, claimed a distant sixth spot in 3:57.28. Denmark (3:57.76) and Great Britain (3:59.46) rounded out the championship finale.

Records Prior to this competition, the existing world and Olympic records were as follows.

The following records were established during the competition:

Date Event Swimmers Nation Time Record August 4 Final Missy Franklin (58.50)Rebecca Soni (1:04.82)Dana Vollmer (55.48)Allison Schmitt (53.25) 3:52.05

Results Heats

Rank Heat Lane Nation Swimmers Time Notes 1 2 5 Emily Seebohm (58.57)Leisel Jones (1:05.96)Alicia Coutts (57.45)Brittany Elmslie (53.44) 3:55.42 Q 2 2 3 Aya Terakawa (59.19)Satomi Suzuki (1:07.15)Yuka Kato (57.73)Haruka Ueda (53.80) 3:57.87 Q 3 2 2 Mie Østergaard Nielsen (1:00.27)Rikke Møller Pedersen (1:07.15)Jeanette Ottesen (56.74)Pernille Blume (54.19) 3:58.35 Q, NR 4 2 4 Rachel Bootsma (59.70)Breeja Larson (1:06.66)Claire Donahue (58.05)Jessica Hardy (54.47) 3:58.88 Q 5 1 7 Sharon van Rouwendaal (1:00.98)Moniek Nijhuis (1:06.98)Inge Dekker (57.43)Femke Heemskerk (53.80) 3:59.19 Q 6 2 6 Gemma Spofforth (1:00.02)Siobhan-Marie O'Connor (1:08.10)Jemma Lowe (57.56)Amy Smith (53.69) 3:59.37 Q 7 1 4 Gao Chang (1:00.41)Sun Ye (1:08.01)Jiao Liuyang (57.56)Tang Yi (53.40) 3:59.38 Q 8 1 5 Maria Gromova (1:01.53)Yuliya Yefimova (1:05.84)Irina Bespalova (58.33)Veronika Popova (53.87) 3:59.57 Q 9 1 3 Jenny Mensing (1:01.02)Sarah Poewe (1:07.19)Alexandra Wenk (58.85)Britta Steffen (52.89) 3:59.95 10 2 7 Sarah Sjöström (1:01.38)Jennie Johansson (1:06.94)Martina Granström (58.46)Michelle Coleman (53.98) 4:00.76 11 1 2 Arianna Barbieri (1:00.80)Michela Guzzetti (1:08.62)Ilaria Bianchi (57.59)Federica Pellegrini (55.19) 4:02.20 12 1 6 Julia Wilkinson (1:00.49)Tera van Beilen (1:08.12)Katerine Savard (59.00)Samantha Cheverton (55.10) 4:02.71 13 2 1 Duane da Rocha (1:00.43)Marina García Urzainqui (1:08.35)Judit Ignacio Sorribes (59.07)Melania Costa Schmid (55.20) 4:03.05 NR 14 1 1 Laure Manaudou (1:01.09)Fanny Babou (1:09.14)Justine Bruno (1:00.17)Charlotte Bonnet (55.13) 4:05.53 15 2 8 Eygló Ósk Gústafsdóttir (1:01.74)Hrafnhildur Lúthersdóttir (1:09.19)Sarah Blake Bateman (1:00.04)Eva Hannesdóttir (56.12) 4:07.09 1 8 Evelyn Verrasztó (1:03.39)Anna Sztankovics (1:17.43)Zsuzsanna JakabosEszter Dara

Final Rank Lane Nation Swimmers Time Time Behind Notes 6 Missy Franklin (58.50)Rebecca Soni (1:04.82)Dana Vollmer (55.48)Allison Schmitt (53.25) 3:52.05 4 Emily Seebohm (59.01)Leisel Jones (1:06.06)Alicia Coutts (56.41)Melanie Schlanger (52.54) 3:54.02 1.97 5 Aya Terakawa (58.99)Satomi Suzuki (1:05.96)Yuka Kato (57.36)Haruka Ueda (53.42) 3:55.73 3.68 NR4 8 Anastasia Zuyeva (59.13)Yuliya Yefimova (1:04.98)Irina Bespalova (58.59)Veronika Popova (53.33) 3:56.03 3.98 NR5 1 Zhao Jing (59.86)Ji Liping (1:06.94)Lu Ying (56.80)Tang Yi (52.81) 3:56.41 4.36 6 2 Sharon van Rouwendaal (1:00.72)Moniek Nijhuis (1:06.74)Inge Dekker (56.91)Ranomi Kromowidjojo (52.91) 3:57.28 5.23 NR7 3 Mie Østergaard Nielsen (59.76)Rikke Møller Pedersen (1:06.77)Jeanette Ottesen (56.83)Pernille Blume (54.40) 3:57.76 5.71 NR8 7 Gemma Spofforth (59.46)Siobhan-Marie O'Connor (1:08.45)Ellen Gandy (57.47)Francesca Halsall (54.08) 3:59.46 7.41

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