# Swimming at the 2017 World Aquatics Championships – Women's 100 metre butterfly

The Women's 100 metre butterfly competition at the 2017 World Championships was held on 23 and 24 July 2017.

## Records

Prior to the competition, the existing world and championship records were as follows.
| World record | Sarah Sjöström (SWE) | 55.48 | Rio de Janeiro, Brazil | 7 August 2016 |
| Competition record | Sarah Sjöström (SWE) | 55.64 | Kazan, Russia | 3 August 2015 |
The following new records were set during this competition.
| Date | Event | Name | Nationality | Time | Record |
| 24 July | Final | Sarah Sjöström | Sweden | 55.53 | CR |

## Results
### Heats

The heats were held on 23 July at 09:30.
| Rank | Heat | Lane | Name | Nationality | Time | Notes |
| 1 | 5 | 4 | Sarah Sjöström | Sweden | 55.96 | Q |
| 2 | 3 | 4 | Kelsi Worrell | United States | 56.44 | Q |
| 3 | 4 | 5 | Emma McKeon | Australia | 56.81 | Q |
| 4 | 3 | 5 | Rikako Ikee | Japan | 57.45 | Q |
| 5 | 4 | 4 | Penny Oleksiak | Canada | 57.51 | Q |
| 6 | 4 | 6 | Zhang Yufei | China | 57.54 | Q |
| 7 | 5 | 6 | An Se-hyeon | South Korea | 57.83 | Q |
| 8 | 5 | 3 | Svetlana Chimrova | Russia | 57.85 | Q |
| 9 | 4 | 3 | Ilaria Bianchi | Italy | 57.98 | Q |
| 10 | 3 | 3 | Liliána Szilágyi | Hungary | 58.00 | Q |
| 11 | 5 | 7 | Sarah Gibson | United States | 58.16 | Q |
| 12 | 4 | 7 | Aliena Schmidtke | Germany | 58.24 | Q |
| 13 | 3 | 2 | Kimberly Buys | Belgium | 58.45 | Q |
| 14 | 5 | 5 | Lu Ying | China | 58.51 | Q |
| 15 | 4 | 2 | Alys Thomas | Great Britain | 58.65 | Q |
| 16 | 5 | 1 | Brianna Throssell | Australia | 58.66 | Q |
| 17 | 5 | 2 | Farida Osman | Egypt | 58.67 | |
| 18 | 3 | 6 | Katerine Savard | Canada | 58.71 | |
| 19 | 3 | 1 | Louise Hansson | Sweden | 58.86 | |
| 20 | 3 | 8 | Emilie Beckmann | Denmark | 58.95 | |
| 21 | 3 | 7 | Béryl Gastaldello | France | 58.97 | |
| 22 | 5 | 8 | Anna Ntountounaki | Greece | 59.01 | |
| 23 | 4 | 1 | Charlotte Atkinson | Great Britain | 59.04 | |
| 24 | 5 | 0 | Keren Siebner | Israel | 59.72 | |
| 25 | 4 | 9 | Nastja Govejšek | Slovenia | 1:00.25 | |
| 26 | 4 | 8 | Lucie Svěcená | Czech Republic | 1:00.34 | |
| 27 | 2 | 4 | Martina van Berkel | Switzerland | 1:00.50 | |
| 28 | 2 | 6 | Chan Kin Lok | Hong Kong | 1:00.52 | |
| 29 | 2 | 6 | Amina Kajtaz | Bosnia and Herzegovina | 1:00.77 | |
| 30 | 4 | 0 | Isabella Paéz | Venezuela | 1:00.90 | |
| 31 | 2 | 5 | Marie Laura Meza | Costa Rica | 1:01.25 | |
| 32 | 3 | 9 | Bryndis Hansen | Iceland | 1:01.32 | |
| 33 | 2 | 3 | Emily Muteti | Kenya | 1:01.35 | NR |
| 34 | 5 | 9 | Barbora Mišendová | Slovakia | 1:01.71 | |
| 35 | 2 | 2 | Jasmine Alkhaldi | Philippines | 1:01.80 | |
| 36 | 2 | 1 | Robyn Lee | Zimbabwe | 1:02.84 | |
| 37 | 2 | 8 | Julimar Avila | Honduras | 1:03.38 | NR |
| 38 | 1 | 5 | Elodie Poo-cheong | Mauritius | 1:03.68 | NR |
| 39 | 2 | 0 | Matelita Buadromo | Fiji | 1:04.94 | |
| 40 | 1 | 6 | Damini Gowda | India | 1:06.19 | |
| 41 | 1 | 8 | Yusra Mardini | FINA Independent Athletes | 1:07.99 | |
| 42 | 1 | 2 | Mishael Ayub | Pakistan | 1:08.33 | NR |
| 43 | 2 | 9 | Alania Suttie | Samoa | 1:08.77 | |
| 44 | 1 | 3 | Lara Aklouk | Jordan | 1:09.37 | |
| 45 | 1 | 1 | Faith Edorodion | Nigeria | 1:13.89 | |
| 46 | 1 | 7 | Mineri Gomez | Guam | 1:17.47 | |
| | 1 | 4 | Gessica Stagno | Mozambique | DNS | DNS |
| | 2 | 7 | Azra Avdic | Peru | DNS | DNS |

### Semifinals

The semifinals were held on 23 July at 17:42.

#### Semifinal 1

| Rank | Lane | Name | Nationality | Time | Notes |
| 1 | 4 | Kelsi Worrell | United States | 56.74 | Q |
| 2 | 5 | Rikako Ikee | Japan | 56.89 | Q |
| 3 | 3 | Zhang Yufei | China | 57.29 | Q |
| 4 | 6 | Svetlana Chimrova | Russia | 57.64 | Q |
| 5 | 2 | Liliána Szilágyi | Hungary | 57.75 | |
| 6 | 7 | Aliena Schmidtke | Germany | 57.87 | |
| 7 | 8 | Brianna Throssell | Australia | 58.21 | |
| 8 | 1 | Lu Ying | China | 58.45 | |

#### Semifinal 2

| Rank | Lane | Name | Nationality | Time | Notes |
| 1 | 4 | Sarah Sjöström | Sweden | 55.77 | Q |
| 2 | 5 | Emma McKeon | Australia | 56.23 | Q, =OC |
| 3 | 3 | Penny Oleksiak | Canada | 57.07 | Q |
| 4 | 6 | An Se-hyeon | South Korea | 57.15 | Q, NR |
| 5 | 2 | Ilaria Bianchi | Italy | 57.95 | |
| 6 | 8 | Alys Thomas | Great Britain | 58.21 | |
| 7 | 7 | Sarah Gibson | United States | 58.48 | |
| 8 | 1 | Kimberly Buys | Belgium | 58.49 | |

### Final

The final was held on 24 July at 17:40.
| Rank | Lane | Name | Nationality | Time | Notes |
| | 4 | Sarah Sjöström | Sweden | 55.53 | CR |
| | 5 | Emma McKeon | Australia | 56.18 | OC |
| | 3 | Kelsi Worrell | United States | 56.37 | |
| 4 | 2 | Penny Oleksiak | Canada | 56.94 | |
| 5 | 7 | An Se-hyeon | South Korea | 57.07 | NR |
| 6 | 6 | Rikako Ikee | Japan | 57.08 | |
| 7 | 8 | Svetlana Chimrova | Russia | 57.24 | |
| 8 | 1 | Zhang Yufei | China | 57.51 | |