The women's 50 metre backstroke event at the 2025 World Aquatics Championships was held from 30 to 31 July 2025 at the World Aquatics Championships Arena at the Singapore Sports Hub in Kallang, Singapore.

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 24.86. 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 25.73. 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.

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

Heats The heats took place on 30 July at 10:02. RankHeatLaneSwimmerNationTimeNotes 1 6 4 Kylie Masse 27.46 Q 2 6 6 Alina Gaifutdinova   Neutral Athletes B 27.57 Q 3 6 3 Wan Letian 27.59 Q 3 7 4 Katharine Berkoff 27.59 Q 5 7 5 Regan Smith 27.67 Q 6 6 5 Analia Pigrée 27.73 Q 7 7 2 Kim Seung-won 27.75 Q 8 7 6 Ingrid Wilm 27.76 Q 9 6 7 Maaike de Waard 27.82 Q 10 5 6 Danielle Hill 27.84 Q 11 7 8 Fanny Teijonsalo 27.85 Q 12 5 2 Roos Vanotterdijk 27.87 Q 13 5 5 Mary-Ambre Moluh 27.93 Q 14 7 7 Theodora Drakou 27.94 Q 15 5 3 Anastasia Gorbenko 27.95 Q 16 5 4 Lauren Cox 27.97 S/off 16 6 9 Celia Pulido 27.97 S/off, NR 18 6 0 Hannah Fredericks 28.03 19 7 1 Lu Xingchen 28.10 20 6 8 Miki Takahashi 28.12 20 7 3 Tessa Giele 28.12 22 6 2 Carmen Weiler 28.14 23 5 9 Olivia Nel 28.23 24 7 0 Julie Kepp Jensen 28.32 25 5 7 Amber George 28.54 26 6 1 Adela Piskorska 28.56 27 5 1 Lora Komoróczy 28.57 27 7 9 Hanna Rosvall 28.57 29 5 8 Savannah-Eve Martin 28.74 30 4 4 Andrea Berrino 29.05 31 4 6 Saovanee Boonamphai 29.17 32 4 7 Chang Ya-jia 29.25 33 4 3 Xeniya Ignatova 29.28 34 4 5 Justine Murdock 29.37 35 4 9 Oumy Diop 29.38 NR 36 4 1 Levenia Sim 29.40 37 5 0 Stephanie Au 29.45 38 4 0 Amel Melih 29.47 39 4 2 Maari Randväli 29.53 40 4 8 Zuri Ferguson 29.81 41 3 6 Laurent Estrada 30.24 42 3 4 Abril Aunchayna 30.43 43 1 6 Parizod Abdukarimova 30.57 44 3 5 Amani Al-Obaidly 30.67 45 3 3 Hana Beiqi 30.72 46 3 8 Antsa Rabejaona 30.78 47 3 2 Enkh-Amgalangiin Ariuntamir 30.93 48 3 7 Lara Giménez 31.01 49 3 9 Sharmeen Mohd Mharvin 31.19 50 2 4 Aynura Primova 31.27 51 2 6 Melodi Saleshando 31.65 52 2 1 Piper Raho 31.76 NR 53 1 5 Bjarta í Lágabø 31.79 54 1 4 Kaila Dacruz 32.05 55 2 5 Chanchakriya Kheun 32.12 56 3 0 Aaliyah Palestrini 32.15 57 3 1 Nubia Adjei 32.23 58 2 2 Marseleima Moss 32.34 59 2 3 Kaiya Brown 33.48 60 2 9 Lana Alrasheed 33.87 NR 61 2 8 Lois Eliora Irishura 34.49 62 2 7 Joanna Chen 34.80 63 2 0 Aragsan Mugabo 36.65 1 3 Hazel Alamy Swim-off The swim-off was started on 30 July at 12:02.

Rank Lane Name Nationality Time Notes 1 4 Lauren Cox 27.64 Q 2 5 Celia Pulido 28.30

Semifinals The semifinals took place on 30 July at 19:38. RankHeatLaneSwimmerNationTimeNotes 1 2 3 Regan Smith 27.23 Q 2 1 8 Lauren Cox 27.26 Q 3 1 5 Katharine Berkoff 27.34 Q 4 2 5 Wan Letian 27.44 Q 5 1 6 Ingrid Wilm 27.48 Q 6 2 4 Kylie Masse 27.50 Q 7 1 3 Analia Pigrée 27.52 Q 8 1 4 Alina Gaifutdinova   Neutral Athletes B 27.57 Q 9 2 1 Mary-Ambre Moluh 27.63 10 2 8 Anastasia Gorbenko 27.65 11 1 7 Roos Vanotterdijk 27.67 NR 12 1 2 Danielle Hill 27.71 13 1 1 Theodora Drakou 27.75 NR 14 2 2 Maaike de Waard 27.87 15 2 6 Kim Seung-won 27.95 16 2 7 Fanny Teijonsalo 28.00

Final The final took place on 31 July at 20:00.

Rank Lane Name Nationality Time Notes 3 Katharine Berkoff 27.08 4 Regan Smith 27.25 6 Wan Letian 27.30 4 7 Kylie Masse 27.33 5 5 Lauren Cox 27.36 6 8 Alina Gaifutdinova   Neutral Athletes B 27.44 7 1 Analia Pigrée 27.47 8 2 Ingrid Wilm 27.56

References