# Swimming at the 2019 World Aquatics Championships – Women's 100 metre butterfly

The Women's 100 metre butterfly competition at the 2019 World Championships was held on 21 and 22 July 2019.

## 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) | 55.53 | Budapest, Hungary | 24 July 2017 |

## Results
### Heats

The heats were held on 21 July at 10:45.
| Rank | Heat | Lane | Name | Nationality | Time | Notes |
| 1 | 6 | 4 | Sarah Sjöström | Sweden | 56.45 | Q |
| 2 | 4 | 4 | Emma McKeon | Australia | 56.90 | Q |
| 3 | 6 | 5 | Maggie MacNeil | Canada | 57.10 | Q |
| 4 | 6 | 3 | Elena Di Liddo | Italy | 57.18 | Q, NR |
| 5 | 5 | 4 | Kelsi Dahlia | United States | 57.22 | Q |
| 6 | 6 | 7 | Marie Wattel | France | 57.23 | Q |
| 7 | 4 | 5 | Louise Hansson | Sweden | 57.50 | Q |
| 8 | 5 | 6 | Katie McLaughlin | United States | 57.67 | Q |
| 9 | 5 | 2 | Anna Ntountounaki | Greece | 57.88 | Q |
| 9 | 5 | 5 | Brianna Throssell | Australia | 57.88 | Q |
| 11 | 5 | 7 | Angelina Köhler | Germany | 57.92 | Q |
| 12 | 4 | 3 | Zhang Yufei | China | 58.02 | Q |
| 13 | 5 | 3 | Svetlana Chimrova | Russia | 58.10 | Q |
| 14 | 4 | 2 | Rebecca Smith | Canada | 58.20 | Q |
| 15 | 6 | 6 | Ilaria Bianchi | Italy | 58.26 | Q |
| 16 | 6 | 8 | Hiroko Makino | Japan | 58.33 | Q |
| 17 | 4 | 1 | Farida Osman | Egypt | 58.43 | |
| 18 | 5 | 1 | Wang Yichun | China | 58.51 | |
| 19 | 5 | 8 | Suzuka Hasegawa | Japan | 58.71 | |
| 20 | 6 | 2 | Béryl Gastaldello | France | 58.83 | |
| 21 | 5 | 0 | Park Ye-rin | South Korea | 58.99 | |
| 22 | 3 | 4 | Amina Kajtaz | Bosnia and Herzegovina | 59.08 | NR |
| 23 | 4 | 6 | Erin Gallagher | South Africa | 59.21 | |
| 24 | 4 | 7 | Alys Thomas | Great Britain | 59.25 | |
| 25 | 6 | 1 | Kimberly Buys | Belgium | 59.26 | |
| 26 | 6 | 0 | Liliána Szilágyi | Hungary | 59.32 | |
| 27 | 5 | 9 | Paulina Nogaj | Poland | 59.82 | |
| 28 | 4 | 8 | Emilie Beckmann | Denmark | 59.94 | |
| 29 | 4 | 9 | Ana Monteiro | Portugal | 1:00.37 | |
| 30 | 3 | 3 | Remedy Rule | Philippines | 1:00.42 | NR |
| 31 | 3 | 7 | Aksana Dziamidava | Belarus | 1:00.51 | |
| 32 | 3 | 6 | Chan Kin Lok | Hong Kong | 1:00.64 | |
| 33 | 3 | 2 | Aleyna Özkan | Turkey | 1:00.68 | |
| 34 | 3 | 8 | Krystal Lara | Dominican Republic | 1:00.79 | |
| 35 | 3 | 1 | Ellen Walshe | Ireland | 1:00.85 | |
| 36 | 3 | 5 | Isabella Páez | Venezuela | 1:01.27 | |
| 37 | 4 | 0 | Quah Jing Wen | Singapore | 1:01.49 | |
| 38 | 6 | 9 | Miriam Guevara | Mexico | 1:01.51 | |
| 39 | 1 | 5 | Alexis Margett | Bolivia | 1:02.59 | |
| 40 | 2 | 3 | Emily Muteti | Kenya | 1:02.88 | |
| 41 | 3 | 9 | Julimar Ávila | Honduras | 1:03.64 | |
| 42 | 3 | 0 | Celina Márquez | El Salvador | 1:03.93 | |
| 43 | 2 | 4 | Lia Ana Lima | Angola | 1:04.40 | |
| 44 | 1 | 4 | Bisma Khan | Pakistan | 1:07.19 | |
| 45 | 1 | 3 | Robyn Lee | Zimbabwe | 1:07.63 | |
| 46 | 2 | 2 | Katie Rock | Albania | 1:07.85 | |
| 47 | 2 | 6 | Yusra Mardini | FINA Independent Athletes | 1:08.79 | |
| 48 | 2 | 0 | Moana Wind | Fiji | 1:10.86 | |
| 49 | 2 | 5 | Aniqah Gaffoor | Sri Lanka | 1:12.63 | |
| 50 | 2 | 8 | Khuyagbaataryn Enkhzul | Mongolia | 1:14.23 | |
| 51 | 2 | 7 | Avice Meya | Uganda | 1:19.69 | |
| 52 | 2 | 1 | Lucie Kouadio-Patinier | Ivory Coast | 1:26.46 | |

### Semifinals

The semifinals were held on 21 July at 20:12.

#### Semifinal 1

| Rank | Lane | Name | Nationality | Time | Notes |
| 1 | 3 | Marie Wattel | France | 57.00 | Q |
| 2 | 4 | Emma McKeon | Australia | 57.01 | Q |
| 3 | 2 | Brianna Throssell | Australia | 57.02 | Q |
| 4 | 5 | Elena Di Liddo | Italy | 57.04 | Q, NR |
| 5 | 6 | Katie McLaughlin | United States | 57.23 | |
| 6 | 1 | Rebecca Smith | Canada | 57.59 | |
| 7 | 7 | Zhang Yufei | China | 57.93 | |
| 8 | 8 | Hiroko Makino | Japan | 58.49 | |

#### Semifinal 2

| Rank | Lane | Name | Nationality | Time | Notes |
| 1 | 4 | Sarah Sjöström | Sweden | 56.29 | Q |
| 2 | 5 | Maggie MacNeil | Canada | 56.52 | Q |
| 3 | 3 | Kelsi Dahlia | United States | 57.06 | Q |
| 4 | 6 | Louise Hansson | Sweden | 57.10 | Q |
| 5 | 1 | Svetlana Chimrova | Russia | 57.78 | |
| 6 | 8 | Ilaria Bianchi | Italy | 57.92 | |
| 7 | 7 | Angelina Köhler | Germany | 57.93 | |
| 8 | 2 | Anna Ntountounaki | Greece | 57.99 | |

### Final

The final was held on 22 July at 20:10.
| Rank | Lane | Name | Nationality | Time | Notes |
| | 5 | Maggie MacNeil | Canada | 55.83 | AM |
| | 4 | Sarah Sjöström | Sweden | 56.22 | |
| | 6 | Emma McKeon | Australia | 56.61 | |
| 4 | 7 | Elena Di Liddo | Italy | 57.07 | |
| 5 | 2 | Brianna Throssell | Australia | 57.09 | |
| 6 | 1 | Kelsi Dahlia | United States | 57.11 | |
| 7 | 8 | Louise Hansson | Sweden | 57.16 | |
| 8 | 3 | Marie Wattel | France | 57.29 | |