The women's 100 metre butterfly event at the 2025 World Aquatics Championships was held from 27 to 28 July 2025 at the World Aquatics Championships Arena at the Singapore Sports Hub in Kallang, Singapore.

Background Gretchen Walsh of the United States was the front-runner in the event. She had set a world record of 54.60 seconds in 2025 and had also swum 54.76 at the 2025 United States Nationals, giving her the seven fastest swims in history and a 1.82-second lead over the second fastest swimmer in 2025. The US's Torri Huske (55.52 best, 56.59 in 2025), won the event at the 2024 Olympics, where she overtook Walsh in the final part of the race.

Germany’s Angelina Köhler, Australia’s Alexandria Perkins (both 56.42), and China’s Zhang Yufei (57.39) were also in contention for medals. Likely finalists included Japan’s Mizuki Hirai, Sweden’s Louise Hansson, Belgium’s Roos Vanotterdijk, the Netherlands’ Tessa Giele, and Japan’s Rikako Ikee.

Qualification Each National Federation was permitted to enter a maximum of two qualified athletes in each individual event, but they could do so only if both of them had attained the "A" standard qualification time. For this event, the "A" standard qualification time was 58.33 seconds. Federations could enter one athlete into the event if they met the "B" standard qualification time. For this event, the "B" standard qualification time was 1:00.37. Athletes could also enter the event if they had met an "A" or "B" standard in a different event and their Federation had not entered anyone else. Additional considerations applied to Federations who had few swimmers enter through the standard qualification times. Federations in this category could at least enter two men and two women to the competition, all of whom could enter into up to two events. +Top 10 fastest qualification timesSwimmerCountryTimeCompetitionGretchen Walsh54.60Fort Lauderdale stop of the 2025 TYR Pro Swim SeriesTorri Huske55.522024 United States Olympic TrialsRegan Smith55.622024 United States Olympic TrialsZhang Yufei56.152024 Summer OlympicsAngelina Köhler56.332025 Berlin Swim OpenAlexandra Perkins56.422025 Australian TrialsMaggie Mac Neil56.442024 Summer OlympicsEmma McKeon56.582024 Australian ChampionshipsMizuki Hirai56.712024 Summer OlympicsBrianna Throssell56.772024 Australian Championships

Records Prior to the competition, the existing world and championship records were as follows.

The following new records were set during this competition. Date Event Name Nationality Time Record 28 July Final Gretchen Walsh 54.73 CR

Heats The heats took place on 27 July at 10:51. Shortly before the heats, USA Swimming announced that Torri Huske had withdrawn from the event to focus on the 4 × 100 metre freestyle relay. The US's Gretchen Walsh swam the fastest qualifying time of 55.68, ahead of Germany's Angelina Köhler and Belgium's Roos Vanotterdijk who swam the second and third fastest times of 56.49 and 56.66, respectively. 2024 Olympic finalist Louise Hansson of Sweden did not qualify.

Rank Heat Lane Name Nationality Time Notes 1 6 4 Gretchen Walsh 55.68 Q 2 6 5 Angelina Köhler 56.49 Q 3 6 6 Roos Vanotterdijk 56.66 Q, NR 4 4 5 Mizuki Hirai 56.81 Q 5 6 3 Yu Yiting 56.83 Q 6 5 5 Alexandria Perkins 56.89 Q 7 4 4 Zhang Yufei 57.11 Q 8 5 2 Daria Klepikova    Neutral Athlete B 57.29 Q 9 6 2 Erin Gallagher 57.48 Q 10 5 6 Tessa Giele 57.56 Q 11 6 7 Lily Price 57.61 Q 12 4 6 Anna Ntountounaki 57.62 Q 13 4 3 Rikako Ikee 57.75 Q 14 4 7 Keanna Macinnes 57.90 Q 15 6 8 Helena Rosendahl Bach 58.15 Q 16 5 7 Costanza Cocconcelli 58.31 Q 17 6 0 Arielle Hayon 58.35 18 5 1 Sara Junevik 58.46 19 4 1 Anastasiya Kuliashova    Neutral Athlete A 58.52 19 6 1 Lilou Ressencourt 58.52 21 4 2 Georgia Damasioti 58.60 22 5 3 Louise Hansson 58.64 23 5 8 Iris Julia Berger 58.91 24 4 8 Amina Kajtaz Pinjo 59.18 24 4 9 Quah Jing Wen 59.18 26 3 4 Brooklyn Douthwright 59.25 27 3 5 Zuzanna Famulok 59.28 28 4 0 Stephanie Balduccini 59.72 29 6 9 Kim Do-yeon 59.78 30 3 6 Miranda Grana 59.86 31 5 9 Barbora Janíčková 59.97 32 3 7 Lismar Lyon 1:00.19 33 5 0 Yeung Hoi Ching 1:00.31 34 3 1 Liu Pei-yin 1:00.90 35 3 3 Napatsawan Jaritkla 1:01.00 36 3 0 Alexia Sotomayor 1:01.38 37 2 3 Emma Sabando 1:01.60 38 3 8 Jessica Calderbank 1:01.62 39 2 5 Imara Thorpe 1:01.64 40 3 9 Varsenik Manucharyan 1:01.68 41 2 4 Jóhanna Elín Guðmundsdóttir 1:01.70 42 2 6 Anje Van As 1:02.63 43 3 2 Sofia Spodarenko 1:02.88 44 2 8 Ashley Calderon 1:03.45 44 2 1 María Schutzmeier 1:03.45 46 2 2 Lia Lima 1:03.86 47 1 5 Davia Richardson 1:04.29 48 2 7 Paige Schendelaar-Kemp 1:05.21 49 1 0 Mia Laban 1:05.41 50 1 4 Cheang Weng Chi 1:05.42 51 2 0 Asma Lefalher 1:05.53 NR 52 2 9 Aleka Persaud 1:06.49 53 1 3 Amaya Bollinger 1:06.93 54 1 1 Honey Nan 1:09.89 55 1 7 Naekeisha Louis 1:12.38 56 1 8 Ony Andrianaivo 1:13.31 57 1 6 Amazya Macrooy 1:14.69 58 1 2 Meral Latheef 1:16.73 5 4 Torri Huske Did not start

Semifinals The semifinals took place on 27 July at 19:13. Russia's Daria Klepikova, representing the Neutral Athletes B team in this competition, swam 56.42 to break her country's national record.

Rank Heat Lane Name Nationality Time Notes 1 2 4 Gretchen Walsh 56.07 Q 1 2 5 Roos Vanotterdijk 56.07 Q, NR 3 1 3 Alexandria Perkins 56.19 Q 4 1 6 Daria Klepikova    Neutral Athlete B 56.42 Q, NR 5 1 4 Angelina Köhler 56.75 Q 6 2 6 Zhang Yufei 56.84 Q 7 1 5 Mizuki Hirai 56.86 Q 8 2 3 Yu Yiting 57.11 Q 9 1 2 Tessa Giele 57.17 10 1 7 Anna Ntountounaki 57.32 11 2 7 Lily Price 57.58 12 1 1 Keanna Macinnes 57.67 13 2 2 Erin Gallagher 57.68 14 2 1 Rikako Ikee 57.89 15 1 8 Costanza Cocconcelli 57.94 16 2 8 Helena Rosendahl Bach 57.98

Final The final took place on 28 July on 19:10.

Rank Lane Name Nationality Time Notes 4 Gretchen Walsh 54.73 CR 5 Roos Vanotterdijk 55.84 NR 3 Alexandria Perkins 56.33 4 7 Zhang Yufei 56.47 5 6 Daria Klepikova    Neutral Athlete B 56.53 6 2 Angelina Köhler 56.57 7 1 Mizuki Hirai 56.83 8 8 Yu Yiting 57.36

Notes

References