Swimming at the 2019 World Aquatics Championships – Women's 50 metre butterfly
The Women's 50 metre butterfly competition at the 2019 World Championships was held on 26 and 27 July 2019.Records
Prior to the competition, the existing world and championship records were as follows.Results
Heats
The heats were held on 26 July at 11:11.
| Rank | Heat | Lane | Name | Nationality | Time | Notes |
| 1 | 7 | 4 | Sarah Sjöström | | 25.39 | Q |
| 2 | 6 | 4 | Kelsi Dahlia | | 25.70 | Q |
| 3 | 5 | 4 | Farida Osman | | 25.71 | Q |
| 4 | 5 | 3 | Penny Oleksiak | | 25.73 | Q |
| 5 | 7 | 5 | Ranomi Kromowidjojo | | 25.86 | Q |
| 6 | 7 | 3 | Louise Hansson | | 25.97 | Q |
| 7 | 6 | 2 | Elena Di Liddo | | 26.03 | Q |
| 8 | 7 | 6 | Marie Wattel | | 26.07 | Q |
| 9 | 7 | 2 | Jeanette Ottesen | | 26.09 | Q |
| 10 | 6 | 6 | Wang Yichun | | 26.13 | Q |
| 11 | 5 | 2 | Maggie MacNeil | | 26.14 | Q |
| 11 | 6 | 1 | Zhang Yufei | | 26.14 | Q |
| 11 | 7 | 0 | Brianna Throssell | | 26.14 | Q |
| 14 | 5 | 5 | Kimberly Buys | | 26.23 | Q |
| 15 | 6 | 7 | Anna Ntountounaki | | 26.26 | Q |
| 16 | 6 | 3 | Arina Surkova | | 26.32 | |
| 16 | 6 | 5 | Emilie Beckmann | | 26.32 | |
| 18 | 5 | 6 | Maaike de Waard | | 26.40 | |
| 19 | 7 | 1 | Erin Gallagher | | 26.45 | |
| 20 | 5 | 7 | Mimosa Jallow | | 26.62 | |
| 21 | 5 | 1 | Svetlana Chimrova | | 26.64 | |
| 22 | 6 | 8 | Angelina Köhler | | 26.65 | |
| 23 | 4 | 5 | Anastasia Gorbenko | | 26.70 | |
| 24 | 7 | 8 | Park Ye-rin | | 26.75 | |
| 25 | 5 | 9 | Huang Mei-chien | | 26.89 | |
| 25 | 7 | 7 | Alexandra Touretski | | 26.89 | |
| 27 | 5 | 0 | Quah Ting Wen | | 26.92 | |
| 28 | 4 | 2 | Jenjira Srisaard | | 26.93 | NR |
| 29 | 6 | 0 | Beatrix Bordás | | 26.98 | |
| 30 | 6 | 9 | Aleyna Özkan | | 27.00 | |
| 31 | 4 | 4 | Sirena Rowe | | 27.02 | |
| 32 | 4 | 7 | Paulina Nogaj | | 27.08 | |
| 33 | 4 | 3 | Chan Kin Lok | | 27.17 | |
| 34 | 4 | 6 | Gabriela Ņikitina | | 27.48 | |
| 34 | 7 | 9 | Anicka Delgado | | 27.48 | |
| 36 | 5 | 8 | Alia Atkinson | | 27.49 | |
| 37 | 4 | 1 | Alexandra Schegoleva | | 27.74 | |
| 38 | 4 | 0 | Maddy Moore | | 28.02 | |
| 39 | 1 | 3 | Alexis Margett | | 28.21 | |
| 40 | 4 | 9 | Maria Schutzmeier | | 28.34 | |
| 41 | 4 | 8 | Chade Nersicio | | 28.45 | |
| 42 | 3 | 3 | Mikaili Charlemagne | | 29.24 | |
| 43 | 2 | 7 | Varsenik Manucharyan | | 29.65 | |
| 44 | 2 | 8 | Sophia Diagne | | 29.90 | |
| 45 | 3 | 1 | Georgia-Leigh Vele | | 30.07 | |
| 46 | 3 | 7 | Aaliyah Palestrini | | 30.18 | |
| 47 | 3 | 6 | Jamila Sanmoogan | | 30.21 | |
| 48 | 3 | 4 | Elodie Poo-cheong | | 30.26 | |
| 49 | 3 | 5 | Aniqah Gaffoor | | 30.36 | |
| 50 | 3 | 2 | Ann-Marie Hepler | | 30.77 | |
| 51 | 1 | 6 | Enkhzul Khuyagbaatar | | 30.80 | |
| 52 | 3 | 8 | Olivia Fuller | | 30.88 | |
| 53 | 2 | 1 | Dirngulbai Misech | | 31.14 | |
| 54 | 1 | 4 | Taffi Illis | | 31.33 | |
| 55 | 2 | 5 | Sofia Shah | | 32.04 | |
| 56 | 2 | 2 | Hemthon Vitiny | | 32.38 | |
| 57 | 2 | 0 | Selina Katumba | | 32.77 | |
| 58 | 3 | 0 | Anastasiya Tyurina | | 33.17 | |
| 59 | 1 | 5 | Aika Watanabe | | 33.43 | |
| 60 | 2 | 4 | Dania Nour | | 34.30 | |
| 61 | 3 | 9 | Domingas Munhemeze | | 34.53 | |
| 62 | 2 | 9 | Lucie Kouadio-Patinier | | 35.43 | |
| 63 | 2 | 3 | Rahel Gebresilassie | | 36.37 | |
| 64 | 2 | 6 | Tity Dumbuya | | 37.90 | |
Swim-off
The swim-off was held on 26 July at 12:02.
| Rank | Lane | Name | Nationality | Time | Notes |
| 1 | 4 | Arina Surkova | | 26.13 | Q |
| 2 | 5 | Emilie Beckmann | | 26.24 | |
Semifinals
The semifinals were held on 26 July at 21:09.Semifinal 1
Semifinal 2
Final
The final was started on 27 July at 20:02.
| Rank | Lane | Name | Nationality | Time | Notes |
| 4 | Sarah Sjöström | | 25.02 | |
| 5 | Ranomi Kromowidjojo | | 25.35 | |
| 2 | Farida Osman | | 25.47 | |
| 4 | 6 | Kelsi Dahlia | | 25.48 | =AM |
| 5 | 3 | Marie Wattel | | 25.50 | NR |
| 6 | 7 | Penny Oleksiak | | 25.69 | |
| 7 | 8 | Jeanette Ottesen | | 25.76 | |
| 8 | 1 | Brianna Throssell | | 26.11 | |
