# Swimming at the 2017 World Aquatics Championships – Women's 50 metre butterfly

The Women's 50 metre butterfly competition at the 2017 World Championships was held on 28 and 29 July 2017.

## Records

Prior to the competition, the existing world and championship records were as follows.
| World record | Sarah Sjöström (SWE) | 24.43 | Borås, Sweden | 5 July 2014 |
| Competition record | Sarah Sjöström (SWE) | 24.96 | Kazan, Russia | 8 August 2015 |
The following new records were set during this competition.
| Date | Event | Name | Nationality | Time | Record |
| 29 July | Final | Sarah Sjöström | Sweden | 24.60 | CR |

## Results
### Heats

The heats were held on 28 July at 09:56.
| Rank | Heat | Lane | Name | Nationality | Time | Notes |
| 1 | 7 | 4 | Sarah Sjöström | Sweden | 25.25 | Q |
| 2 | 7 | 5 | Kelsi Worrell | United States | 25.65 | Q |
| 3 | 6 | 4 | Rikako Ikee | Japan | 25.72 | Q |
| 4 | 7 | 2 | Aliena Schmidtke | Germany | 25.73 | Q, NR |
| 5 | 5 | 4 | Ranomi Kromowidjojo | Netherlands | 25.74 | Q |
| 5 | 7 | 1 | Farida Osman | Egypt | 25.74 | Q, AF |
| 7 | 6 | 2 | Béryl Gastaldello | France | 25.79 | Q, NR |
| 8 | 6 | 3 | Mélanie Henique | France | 25.81 | Q |
| 9 | 5 | 5 | Kimberly Buys | Belgium | 25.82 | Q, NR |
| 10 | 6 | 5 | Penny Oleksiak | Canada | 25.87 | Q |
| 11 | 5 | 6 | Emilie Beckmann | Denmark | 25.88 | Q |
| 12 | 7 | 6 | Holly Barratt | Australia | 25.91 | Q |
| 13 | 6 | 7 | Aleksandra Urbańczyk | Poland | 26.00 | Q |
| 14 | 7 | 3 | Maaike de Waard | Netherlands | 26.03 | Q |
| 15 | 5 | 2 | Silvia di Pietro | Italy | 26.24 | Q |
| 16 | 5 | 3 | Lu Ying | China | 26.34 | Q |
| 17 | 7 | 7 | Zhang Yufei | China | 26.40 | |
| 18 | 6 | 6 | Svetlana Chimrova | Russia | 26.49 | |
| 19 | 6 | 1 | Flóra Molnár | Hungary | 26.51 | |
| 20 | 7 | 8 | Louise Hansson | Sweden | 26.55 | |
| 21 | 6 | 0 | Brittany Elmslie | Australia | 26.61 | |
| 22 | 5 | 1 | Nastja Govejšek | Slovenia | 26.65 | |
| 22 | 6 | 9 | Park Ye-rin | South Korea | 26.65 | |
| 22 | 6 | 8 | Sarah Gibson | United States | 26.65 | |
| 25 | 5 | 7 | Katerine Savard | Canada | 26.81 | |
| 26 | 4 | 3 | Amit Ivry | Israel | 26.88 | |
| 27 | 4 | 6 | Mimosa Jallow | Finland | 26.89 | |
| 28 | 7 | 9 | Lucie Svěcená | Czech Republic | 26.90 | |
| 29 | 7 | 0 | Anna Ntountounaki | Greece | 26.94 | |
| 30 | 4 | 2 | Gabriela Ņikitina | Latvia | 26.95 | NR |
| 31 | 5 | 9 | Bryndis Hansen | Iceland | 27.15 | |
| 32 | 4 | 4 | Barbora Mišendová | Slovakia | 27.23 | |
| 33 | 4 | 1 | Amina Kajtaz | Bosnia and Herzegovina | 27.35 | |
| 34 | 4 | 8 | Erin Gallagher | South Africa | 27.36 | |
| 35 | 5 | 8 | Helena Gasson | New Zealand | 27.37 | |
| 36 | 4 | 7 | Chan Kin Lok | Hong Kong | 27.47 | |
| 37 | 3 | 4 | Emily Muteti | Kenya | 27.78 | NR |
| 38 | 4 | 0 | Marie Laura Meza | Costa Rica | 27.97 | NR |
| 39 | 3 | 5 | Alexandra Schegoleva | Cyprus | 28.22 | |
| 39 | 3 | 6 | Talita Baqlah | Jordan | 28.22 | NR |
| 41 | 4 | 9 | Chade Nersicio | Curaçao | 28.41 | |
| 42 | 2 | 0 | María José Ribera | Bolivia | 28.48 | |
| 43 | 3 | 3 | Elinah Phillip | British Virgin Islands | 28.51 | |
| 44 | 2 | 1 | Nicole Rautemberg | Paraguay | 29.13 | |
| 45 | 1 | 4 | Jamila Sanmoogan | Guyana | 30.02 | NR |
| 45 | 3 | 7 | Ann-Marie Hepler | Marshall Islands | 30.02 | |
| 47 | 3 | 2 | Ana Sofia Nóbrega | Angola | 30.18 | |
| 48 | 2 | 6 | Mishael Aisha Ayub | Pakistan | 30.77 | |
| 49 | 2 | 4 | Hantan Raharvel | Madagascar | 30.89 | NR |
| 50 | 3 | 8 | Gabby Gittens | Antigua and Barbuda | 31.77 | |
| 51 | 2 | 5 | Hemthon Vitiny | Cambodia | 32.39 | NR |
| 52 | 3 | 9 | Faith Edorodion | Nigeria | 32.61 | |
| 53 | 2 | 3 | Avice Meya | Uganda | 33.05 | NR |
| 54 | 1 | 3 | Kestra Kihleng | Micronesia | 33.06 | |
| 55 | 3 | 0 | Charissa Panuve | Tonga | 33.43 | |
| 56 | 2 | 9 | Karina Klimyk | Tajikistan | 33.55 | NR |
| 57 | 2 | 7 | Diana Basho | Albania | 34.09 | |
| 58 | 2 | 2 | Ritaj Amin | Bahrain | 35.69 | NR |
| 59 | 2 | 8 | Nafissath Radji | Benin | 42.12 | NR |
| | 1 | 5 | Fatou Bintou Diagne | Senegal | DNS | DNS |
| | 3 | 1 | Gessica Stagno | Mozambique | DNS | DNS |
| | 4 | 5 | Alys Thomas | Great Britain | DNS | DNS |
| | 5 | 0 | Pernille Blume | Denmark | DNS | DNS |

### Semifinals

The semifinals were held on 28 July at 18:46.

#### Semifinal 1

| Rank | Lane | Name | Nationality | Time | Notes |
| 1 | 4 | Kelsi Worrell | United States | 25.57 | Q |
| 2 | 6 | Mélanie Henique | France | 25.63 | Q, NR |
| 3 | 2 | Penny Oleksiak | Canada | 25.66 | Q, NR |
| 4 | 5 | Aliena Schmidtke | Germany | 25.68 | Q, NR |
| 5 | 3 | Farida Osman | Egypt | 25.73 | Q, AF |
| 6 | 7 | Holly Barratt | Australia | 25.76 | |
| 7 | 8 | Lu Ying | China | 25.79 | |
| 8 | 1 | Maaike de Waard | Netherlands | 25.89 | |

#### Semifinal 2

| Rank | Lane | Name | Nationality | Time | Notes |
| 1 | 4 | Sarah Sjöström | Sweden | 25.30 | Q |
| 2 | 3 | Ranomi Kromowidjojo | Netherlands | 25.67 | Q |
| 3 | 2 | Kimberly Buys | Belgium | 25.70 | Q, NR |
| 4 | 7 | Emilie Beckmann | Denmark | 25.77 | |
| 5 | 5 | Rikako Ikee | Japan | 25.90 | |
| 6 | 1 | Aleksandra Urbańczyk | Poland | 25.94 | |
| 7 | 6 | Béryl Gastaldello | France | 26.01 | |
| 8 | 8 | Silvia di Pietro | Italy | 26.06 | |

### Final

The final was held on 29 July at 17:32.
| Rank | Lane | Name | Nationality | Time | Notes |
| | 4 | Sarah Sjöström | Sweden | 24.60 | CR |
| | 2 | Ranomi Kromowidjojo | Netherlands | 25.38 | |
| | 8 | Farida Osman | Egypt | 25.39 | AF |
| 4 | 5 | Kelsi Worrell | United States | 25.48 | AM |
| 5 | 6 | Penny Oleksiak | Canada | 25.62 | NR |
| 6 | 3 | Mélanie Henique | France | 25.76 | |
| 7 | 1 | Kimberly Buys | Belgium | 25.78 | |
| 8 | 7 | Aliena Schmidtke | Germany | 26.08 | |