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

The women's 100 metre butterfly event at the 11th FINA World Swimming Championships (25m) took place 15 – 16 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 | Diane Bui Duyet | France | 55.05 | Istanbul | 12 December 2009 |
| Championship record | Felicity Galvez | Australia | 55.43 | Dubai | 19 December 2010 |
No new records were set during this competition.

## Results
### Heats

| Rank | Heat | Lane | Name | Time | Notes |
| 1 | 7 | 8 | Liu Zige (CHN) | 57.31 | Q |
| 2 | 7 | 7 | Noemie It-Ting Thomas (CAN) | 57.32 | Q |
| 3 | 5 | 4 | Jemma Lowe (GBR) | 57.53 | Q |
| 4 | 5 | 5 | Claire Donahue (USA) | 57.58 | Q |
| 5 | 6 | 5 | Louise Hansson (SWE) | 57.81 | Q |
| 6 | 5 | 3 | Kathleen Hersey (USA) | 57.83 | Q |
| 7 | 7 | 6 | Daynara de Paula (BRA) | 57.87 | Q |
| 8 | 7 | 5 | Katerine Savard (CAN) | 58.01 | Q |
| 9 | 6 | 7 | Nao Kobayashi (JPN) | 58.10 | Q |
| 10 | 6 | 4 | Ilaria Bianchi (ITA) | 58.15 | Q |
| 11 | 6 | 9 | Kona Fujita (JPN) | 58.22 | Q |
| 12 | 6 | 6 | Emilia Pikkarainen (FIN) | 58.34 | Q |
| 13 | 5 | 2 | Silvia di Pietro (ITA) | 58.36 | Q |
| 14 | 6 | 3 | Birgit Koschischek (AUT) | 58.39 | Q |
| 15 | 4 | 6 | Sze Hang Yu (HKG) | 58.50 | Q |
| 16 | 7 | 3 | Veronika Popova (RUS) | 58.54 | Q |
| 17 | 6 | 2 | Brianna Throssell (AUS) | 58.71 | |
| 18 | 2 | 0 | Lu Ying (CHN) | 58.85 | |
| 19 | 5 | 8 | Danielle Villars (SUI) | 58.87 | NR |
| 20 | 6 | 1 | İris Rosenberger (TUR) | 58.96 | |
| 21 | 5 | 7 | Judit Ignacio Sorribes (ESP) | 59.09 | |
| 21 | 6 | 0 | Mandy Loots (RSA) | 59.09 | |
| 23 | 7 | 9 | Eszter Dara (HUN) | 59.25 | |
| 24 | 7 | 2 | Paulina Schmiedel (GER) | 59.26 | |
| 25 | 7 | 0 | Marne Erasmus (RSA) | 59.31 | |
| 26 | 2 | 8 | Elmira Aigaliyeva (KAZ) | 59.45 | |
| 27 | 7 | 1 | Sara Oliveira (POR) | 59.74 | |
| 28 | 5 | 0 | Anna Dowgiert (POL) | 59.80 | |
| 29 | 5 | 6 | Daria Tcvetkova (RUS) | 1:00.01 | |
| 30 | 5 | 9 | Chan Kin Lok (HKG) | 1:00.18 | |
| 31 | 6 | 8 | Denisa Smolenová (SVK) | 1:00.77 | |
| 32 | 4 | 3 | Jasmin Rosenberger (TUR) | 1:00.89 | |
| 33 | 4 | 5 | Nina Rangelova (BUL) | 1:01.06 | |
| 34 | 4 | 7 | Jessica Camposano (COL) | 1:01.08 | |
| 35 | 4 | 2 | Sini Kuutamo (FIN) | 1:01.24 | |
| 36 | 3 | 5 | Manuela Morano (ARG) | 1:01.51 | |
| 37 | 3 | 3 | Karen Torrez (BOL) | 1:02.07 | NR |
| 38 | 4 | 1 | Monalisa Arieswati Lorenza (INA) | 1:03.14 | |
| 39 | 3 | 2 | Caroline Pickering Puamau (FIJ) | 1:03.30 | |
| 40 | 4 | 4 | Nguyen Thi Kim Tuyen (VIE) | 1:03.31 | |
| 41 | 4 | 9 | Zabrina Holder (BAR) | 1:03.38 | |
| 42 | 4 | 8 | Pooja Raghava Alva (IND) | 1:03.45 | |
| 43 | 4 | 0 | Dalia Tórrez Zamora (NCA) | 1:04.33 | |
| 44 | 3 | 6 | Oriele Espinoza (PER) | 1:04.41 | |
| 45 | 3 | 8 | Ana Sofia Nobrega (ANG) | 1:05.28 | |
| 46 | 3 | 4 | Marie Meza (CRC) | 1:05.61 | |
| 47 | 3 | 0 | Angie Galdamez (HON) | 1:05.76 | |
| 48 | 3 | 1 | Tieri Erasito (FIJ) | 1:06.32 | |
| 49 | 1 | 5 | Su Rim Choe (PRK) | 1:06.71 | |
| 50 | 2 | 4 | Kiran Khan (PAK) | 1:06.87 | |
| 51 | 3 | 9 | Emily Siobhan Muteti (KEN) | 1:09.11 | |
| 52 | 3 | 7 | Faith Edorodion (NGR) | 1:09.60 | |
| 53 | 2 | 5 | Oreoluwa Cherebin (GRN) | 1:10.32 | |
| 54 | 2 | 2 | Felicity Passon (SEY) | 1:10.79 | |
| 55 | 2 | 7 | Afsana Ismayilova (AZE) | 1:11.94 | |
| 56 | 2 | 3 | Monica Saili (SAM) | 1:12.37 | |
| 57 | 2 | 1 | Charissa Sofia Panuve (TGA) | 1:13.40 | |
| 58 | 2 | 6 | Surennyam Erdenebileg (MGL) | 1:14.00 | |
| | 1 | 3 | Erika Torrellas (VEN) | DNS | |
| | 1 | 4 | Wendy Rodriguez (VEN) | DNS | |
| | 5 | 1 | Katrine Soerensen (DEN) | DNS | |
| | 7 | 4 | Jeanette Ottesen (DEN) | DNS | |

### Semifinals

| Rank | Heat | Lane | Name | Nationality | Time | Notes |
| 1 | 1 | 2 | Ilaria Bianchi | Italy | 56.60 | Q |
| 2 | 1 | 4 | Noemie It-Ting Thomas | Canada | 56.64 | Q, NR |
| 3 | 2 | 5 | Jemma Lowe | United Kingdom | 57.16 | Q |
| 4 | 2 | 4 | Liu Zige | China | 57.24 | Q |
| 5 | 1 | 5 | Claire Donahue | United States | 57.51 | Q |
| 6 | 2 | 1 | Silvia di Pietro | Italy | 57.62 | Q |
| 7 | 1 | 3 | Kathleen Hersey | United States | 57.65 | Q |
| 8 | 2 | 3 | Louise Hansson | Sweden | 57.79 | |
| 9 | 1 | 8 | Veronika Popova | Russia | 57.82 | |
| 10 | 2 | 6 | Daynara de Paula | Brazil | 57.87 | Q |
| 11 | 2 | 2 | Nao Kobayashi | Japan | 57.99 | |
| 12 | 1 | 7 | Emilia Pikkarainen | Finland | 58.04 | NR |
| 13 | 1 | 6 | Katerine Savard | Canada | 58.13 | |
| 14 | 1 | 1 | Birgit Koschischek | Austria | 58.40 | |
| 15 | 2 | 8 | Sze Hang Yu | Hong Kong | 58.66 | |
| 16 | 2 | 7 | Kona Fujita | Japan | 58.71 | |

### Final

The final was held at 19:49.
| Rank | Lane | Name | Nationality | Time | Notes |
| | 4 | Ilaria Bianchi | Italy | 56.13 | NR |
| | 6 | Liu Zige | China | 56.58 | |
| | 3 | Jemma Lowe | Great Britain | 56.66 | |
| 4 | 5 | Noemie It-Ting Thomas | Canada | 56.92 | |
| 5 | 2 | Claire Donahue | United States | 57.00 | |
| 6 | 1 | Kathleen Hersey | United States | 57.35 | |
| 7 | 7 | Silvia di Pietro | Italy | 58.14 | |
| 8 | 8 | Daynara de Paula | Brazil | 59.64 | |