# 2018 FINA World Swimming Championships (25 m) – Women's 100 metre butterfly

The Women's 100 metre butterfly competition of the 2018 FINA World Swimming Championships (25 m) was held on 15 and 16 December 2018 at the Hangzhou Olympic Sports Center.

## Records

Prior to the competition, the existing world and championship records were as follows.
| | Name | Nation | Time | Location | Date |
| World record Championship record | Sarah Sjöström | Sweden | 54.61 | Doha | 7 December 2014 |

## Results
### Heats

The heats were started on 15 December at 10:22.
| Rank | Heat | Lane | Name | Nationality | Time | Notes |
| 1 | 5 | 4 | Kelsi Dahlia | United States | 55.46 | Q |
| 2 | 4 | 6 | Ai Soma | Japan | 56.52 | Q |
| 3 | 5 | 2 | Kendyl Stewart | United States | 56.57 | Q |
| 4 | 3 | 3 | Elena Di Liddo | Italy | 56.62 | Q |
| 5 | 3 | 5 | Daiene Dias | Brazil | 56.78 | Q |
| 6 | 5 | 5 | Ilaria Bianchi | Italy | 56.85 | Q |
| 7 | 5 | 9 | Haley Black | Canada | 57.10 | Q |
| 8 | 5 | 6 | Wang Yichun | China | 57.12 | Q |
| 9 | 4 | 4 | Zhang Yufei | China | 57.21 | Q |
| 10 | 4 | 5 | Aliena Schmidtke | Germany | 57.23 | Q |
| 11 | 3 | 4 | Svetlana Chimrova | Russia | 57.36 | Q |
| 12 | 3 | 6 | Yukina Hirayama | Japan | 57.59 | Q |
| 13 | 3 | 2 | Anna Ntountounaki | Greece | 57.64 | Q |
| 14 | 4 | 3 | Kim Busch | Netherlands | 57.76 | Q |
| 15 | 4 | 7 | Anastasiya Shkurdai | Belarus | 58.10 | Q |
| 16 | 5 | 8 | Park Ye-rin | South Korea | 58.22 | Q |
| 17 | 3 | 7 | Emilie Løvberg | Norway | 58.24 | |
| 18 | 5 | 7 | Erin Gallagher | South Africa | 58.29 | |
| 19 | 4 | 1 | Alexandra Touretski | Switzerland | 58.34 | |
| 20 | 4 | 0 | Amina Kajtaz | Bosnia and Herzegovina | 58.78 | |
| 21 | 4 | 2 | Daria Kartashova | Russia | 58.86 | |
| 22 | 5 | 1 | Chan Kin Lok | Hong Kong | 58.89 | |
| 23 | 3 | 1 | Lucie Svěcená | Czech Republic | 59.00 | |
| 24 | 5 | 0 | Ana Monteiro | Portugal | 59.27 | |
| 25 | 3 | 0 | Isabella Páez | Venezuela | 59.69 | |
| 26 | 3 | 8 | Nida Eliz Üstündağ | Turkey | 59.79 | |
| 27 | 4 | 8 | Nicholle Toh | Singapore | 1:00.20 | |
| 28 | 2 | 5 | Celina Márquez | El Salvador | 1:00.60 | |
| 29 | 4 | 9 | Vanessa Ouwehand | New Zealand | 1:01.46 | |
| 30 | 2 | 3 | Elodie Poo-cheong | Mauritius | 1:02.08 | |
| 31 | 2 | 4 | Beatriz Padrón | Costa Rica | 1:02.15 | |
| 32 | 3 | 9 | Alexandra Schegoleva | Cyprus | 1:02.62 | |
| 33 | 1 | 6 | Huang Mei-chien | Chinese Taipei | 1:02.96 | |
| 34 | 2 | 6 | Alsu Bayramova | Azerbaijan | 1:03.14 | |
| 35 | 2 | 2 | Hiba Doueihy | Lebanon | 1:03.51 | |
| 36 | 2 | 7 | Imara-Bella Thorpe | Kenya | 1:03.62 | |
| 37 | 1 | 1 | Karla Abarca | Nicaragua | 1:04.09 | |
| 38 | 1 | 7 | Bisma Khan | Pakistan | 1:04.87 | |
| 39 | 2 | 1 | Michell Ramirez | Honduras | 1:05.39 | |
| 40 | 1 | 2 | Dirngulbai Misech | Palau | 1:08.44 | |
| 40 | 2 | 8 | Lara Aklouk | Jordan | 1:08.44 | |
| 42 | 1 | 4 | Avice Meya | Uganda | 1:12.97 | NR |
| 43 | 2 | 9 | Mineri Kurotori Gomez | Guam | 1:15.52 | |
| 44 | 2 | 0 | Celina Itatiro | Tanzania | 1:21.26 | |
| 45 | 1 | 5 | Aishath Sausan | Maldives | 1:23.16 | |
| | 1 | 3 | Lucie Kouadio-Patinier | Ivory Coast | DNS | |
| | 5 | 3 | Katinka Hosszú | Hungary | DNS | |

### Semifinals

The semifinals were held at 19:31.

#### Semifinal 1

| Rank | Lane | Name | Nationality | Time | Notes |
| 1 | 5 | Elena di Liddo | Italy | 56.06 | Q |
| 2 | 4 | Ai Soma | Japan | 56.31 | Q |
| 3 | 3 | Ilaria Bianchi | Italy | 56.79 | Q |
| 4 | 6 | Wang Yichun | China | 56.80 | Q |
| 5 | 7 | Yukina Hirayama | Japan | 57.10 | R |
| 6 | 2 | Aliena Schmidtke | Germany | 57.27 | |
| 7 | 1 | Kim Busch | Netherlands | 57.63 | |
| 8 | 8 | Park Ye-rin | South Korea | 58.21 | |

#### Semifinal 2

| Rank | Lane | Name | Nationality | Time | Notes |
| 1 | 4 | Kelsi Dahlia | United States | 55.09 | Q |
| 2 | 3 | Daiene Dias | Brazil | 56.40 | Q, SA |
| 3 | 5 | Kendyl Stewart | United States | 56.62 | Q |
| 4 | 2 | Zhang Yufei | China | 56.77 | Q |
| 5 | 6 | Haley Black | Canada | 56.91 | R |
| 6 | 8 | Anastasiya Shkurdai | Belarus | 57.20 | |
| 7 | 1 | Anna Ntountounaki | Greece | 57.42 | |
| 8 | 7 | Svetlana Chimrova | Russia | 57.48 | |

### Final

The final was held at 19:08.
| Rank | Lane | Name | Nationality | Time | Notes |
| | 4 | Kelsi Dahlia | United States | 55.01 | |
| | 2 | Kendyl Stewart | United States | 56.22 | |
| | 6 | Daiene Dias | Brazil | 56.31 | SA |
| 4 | 7 | Ilaria Bianchi | Italy | 56.39 | |
| 5 | 5 | Elena di Liddo | Italy | 56.50 | |
| 6 | 8 | Haley Black | Canada | 56.72 | |
| 7 | 3 | Ai Soma | Japan | 56.76 | |
| 8 | 1 | Wang Yichun | China | 56.96 | |