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

The women's 100 metre individual medley event at the 11th FINA World Swimming Championships (25m) took place 13 – 14 December 2012 at the Sinan Erdem Dome.

## Records

Prior to this competition, the existing world and championship records were as follows.
| | Name | Nation | Time | Location | Date |
| World record | Hinkelien Schreuder | Netherlands | 57.74 | Berlin | 15 November 2009 |
| Championship record | Ariana Kukors | United States | 58.65 | Dubai | 16 December 2010 |
The following records were established during the competition:
| Date | Event | Name | Nation | Time | Record |
| 14 December | Final | Katinka Hosszú | Hungary | 58.49 | CR |

## Results
### Heats

| Rank | Heat | Lane | Name | Time | Notes |
| 1 | 5 | 4 | Sophie Allen (GBR) | 59.20 | Q |
| 2 | 5 | 3 | Rūta Meilutytė (LTU) | 59.33 | Q, NR |
| 3 | 7 | 4 | Katinka Hosszú (HUN) | 59.37 | Q |
| 4 | 7 | 3 | Kanako Watanabe (JPN) | 59.74 | Q, NR |
| 5 | 6 | 4 | Zsuzsanna Jakabos (HUN) | 59.84 | Q |
| 6 | 1 | 5 | Melanie Margalis (USA) | 1:00.03 | Q |
| 6 | 7 | 5 | Theresa Michalak (GER) | 1:00.03 | Q |
| 8 | 2 | 8 | Aleksandra Gerasimenya (BLR) | 1:00.32 | Q |
| 9 | 1 | 8 | Zhao Jing (CHN) | 1:00.37 | Q |
| 10 | 7 | 7 | Chen Xinyi (CHN) | 1:00.45 | Q |
| 11 | 5 | 5 | Hanna-Maria Seppälä (FIN) | 1:00.79 | Q |
| 12 | 6 | 3 | Emu Higuchi (JPN) | 1:00.85 | Q |
| 13 | 6 | 5 | Alia Atkinson (JAM) | 1:00.99 | Q |
| 13 | 7 | 6 | Emilia Pikkarainen (FIN) | 1:00.99 | Q |
| 15 | 1 | 3 | Hannah Miley (GBR) | 1:01.19 | WD |
| 16 | 7 | 8 | Alicja Tchórz (POL) | 1:01.37 | Q |
| 17 | 2 | 7 | Madeline Dirado (USA) | 1:01.55 | Q |
| 18 | 7 | 2 | Birgit Koschischek (AUT) | 1:01.56 | |
| 19 | 5 | 9 | Hanna Dzerkal (UKR) | 1:01.62 | |
| 20 | 5 | 6 | Katrine Soerensen (DEN) | 1:01.74 | |
| 21 | 6 | 6 | Vitalina Simonova (RUS) | 1:01.77 | |
| 22 | 1 | 4 | Hrafnhildur Lúthersdóttir (ISL) | 1:01.85 | |
| 23 | 6 | 1 | Ellen Fullerton (AUS) | 1:02.03 | |
| 24 | 7 | 1 | Sarah Katsoulis (AUS) | 1:02.14 | |
| 25 | 6 | 2 | Barbora Závadová (CZE) | 1:02.55 | |
| 26 | 5 | 0 | Fernanda González (MEX) | 1:02.63 | |
| 27 | 6 | 0 | Chan Kin Lok (HKG) | 1:02.76 | |
| 28 | 5 | 8 | Manuela Morano (ARG) | 1:02.85 | NR |
| 29 | 6 | 8 | Mandy Loots (RSA) | 1:02.90 | |
| 29 | 7 | 0 | Gizem Bozkurt (TUR) | 1:02.90 | |
| 31 | 5 | 1 | Flavia Cazziolato (BRA) | 1:03.10 | |
| 32 | 6 | 9 | Samantha Yeo (SIN) | 1:03.58 | NR |
| 33 | 1 | 1 | Chantal van Landeghem (CAN) | 1:03.93 | |
| 34 | 5 | 7 | Ceren Dilek (TUR) | 1:04.14 | |
| 35 | 4 | 5 | Sarah Rolko (LUX) | 1:04.29 | |
| 36 | 6 | 7 | Kelly Rasmussen (DEN) | 1:04.30 | |
| 37 | 7 | 9 | Kristina Krasyukova (RUS) | 1:04.46 | |
| 38 | 4 | 4 | Rene Warnes (RSA) | 1:04.58 | |
| 39 | 4 | 0 | Caroline Pickering Puamau (FIJ) | 1:05.47 | |
| 40 | 4 | 6 | Julie Meynen (LUX) | 1:05.49 | |
| 41 | 4 | 3 | Lynette Ng (SIN) | 1:05.80 | |
| 42 | 4 | 7 | Christine Briedenhann (NAM) | 1:06.71 | |
| 43 | 1 | 7 | Karen Torrez (BOL) | 1:06.76 | NR |
| 44 | 3 | 5 | Mariangel Hidalgo (CRC) | 1:07.09 | |
| 45 | 4 | 2 | Miriam Corsini (MOZ) | 1:07.63 | |
| 46 | 4 | 1 | Zabrina Holder (BAR) | 1:07.69 | |
| 47 | 3 | 4 | Kuan Weng I (MAC) | 1:07.85 | |
| 48 | 4 | 9 | Tan Chi Yan (MAC) | 1:08.08 | |
| 49 | 4 | 8 | Dalia Tórrez Zamora (NCA) | 1:08.39 | |
| 50 | 3 | 8 | Barbara Vali-Skelton (PNG) | 1:09.22 | |
| 51 | 3 | 3 | Pooja Raghava Alva (IND) | 1:09.48 | |
| 52 | 3 | 1 | Tegan McCarthy (PNG) | 1:09.69 | |
| 53 | 3 | 2 | Lianna Catherine Swan (PAK) | 1:09.89 | |
| 54 | 3 | 0 | Monica Saili (SAM) | 1:11.26 | |
| 55 | 3 | 9 | Patricia Cani (ALB) | 1:11.75 | |
| 56 | 2 | 2 | Domoinanavalona Amboaratiana (MAD) | 1:11.93 | |
| 57 | 3 | 7 | Fabiola Espinoza Herrera (NCA) | 1:12.00 | |
| 58 | 3 | 6 | Aurelie Fanchette (SEY) | 1:13.23 | |
| 59 | 2 | 1 | Athena Gaskin (GUY) | 1:16.70 | |
| 60 | 2 | 4 | Ann-Marie Hepler (MHL) | 1:17.75 | |
| 61 | 2 | 0 | Bonita Imsirovic (BOT) | 1:18.18 | |
| 62 | 2 | 5 | Danielle Atoigue (GUM) | 1:20.52 | |
| 63 | 2 | 6 | Angela Kendrick (MHL) | 1:21.68 | |
| 64 | 2 | 3 | Shne Joachim (VIN) | 1:21.98 | |
| | 2 | 9 | Adzo Kpossi (TOG) | DSQ | |
| | 1 | 2 | Mercedes Toledo (VEN) | DNS | |
| | 1 | 6 | Ophelia Swayne (GHA) | DNS | |
| | 5 | 2 | Wendy van der Zanden (NED) | DNS | |

### Semifinals

| Rank | Heat | Lane | Name | Nationality | Time | Notes |
| 1 | 2 | 1 | Alia Atkinson | Jamaica | 58.94 | Q, NR |
| 2 | 2 | 2 | Zhao Jing | China | 59.12 | Q |
| 3 | 1 | 4 | Rūta Meilutytė | Lithuania | 59.15 | Q, NR |
| 4 | 2 | 5 | Katinka Hosszú | Hungary | 59.17 | Q |
| 5 | 1 | 6 | Aleksandra Gerasimenya | Belarus | 59.29 | Q, NR |
| 6 | 2 | 4 | Sophie Allen | United Kingdom | 59.58 | Q |
| 7 | 2 | 3 | Zsuzsanna Jakabos | Hungary | 59.68 | Q |
| 8 | 2 | 6 | Theresa Michalak | Germany | 59.81 | Q |
| 9 | 1 | 3 | Melanie Margalis | United States | 1:00.12 | |
| 10 | 1 | 5 | Kanako Watanabe | Japan | 1:00.16 | |
| 11 | 1 | 2 | Chen Xinyi | China | 1:00.22 | |
| 12 | 1 | 7 | Emu Higuchi | Japan | 1:00.51 | |
| 13 | 1 | 1 | Emilia Pikkarainen | Finland | 1:00.55 | |
| 14 | 2 | 8 | Alicja Tchórz | Poland | 1:00.93 | |
| 15 | 1 | 8 | Madeline Dirado | United States | 1:01.07 | |
| 16 | 2 | 7 | Hanna-Maria Seppälä | Finland | 1:01.98 | |

### Final

The final was held at 20:52.
| Rank | Lane | Name | Nationality | Time | Notes |
| | 6 | Katinka Hosszú | Hungary | 58.49 | CR |
| | 3 | Rūta Meilutytė | Lithuania | 58.79 | NR |
| | 5 | Zhao Jing | China | 58.80 | |
| 4 | 4 | Alia Atkinson | Jamaica | 58.85 | NR |
| 5 | 2 | Aleksandra Gerasimenya | Belarus | 58.94 | NR |
| 6 | 7 | Sophie Allen | United Kingdom | 59.03 | |
| 7 | 1 | Zsuzsanna Jakabos | Hungary | 59.41 | |
| 8 | 8 | Theresa Michalak | Germany | 59.68 | |