# Swimming at the 2023 World Aquatics Championships – Women's 100 metre backstroke

The women's 100 metre backstroke competition at the 2023 World Aquatics Championships was held on 24 and 25 July 2023.

## Records

Prior to the competition, the existing world and championship records were as follows.
| World record | Kaylee McKeown (AUS) | 57.45 | Adelaide, Australia | 13 June 2021 |
| Competition record | Regan Smith (USA) | 57.57 | Gwangju, South Korea | 28 July 2019 |
The following new records were set during this competition.
| Date | Event | Name | Nationality | Time | Record |
| 25 July | Final | Kaylee McKeown | Australia | 57.53 | CR |

## Results
### Heats

The heats were started on 24 July at 10:32.
| Rank | Heat | Lane | Name | Nationality | Time | Notes |
| 1 | 6 | 4 | Regan Smith | United States | 58.47 | Q |
| 2 | 7 | 4 | Kaylee McKeown | Australia | 58.90 | Q |
| 3 | 5 | 4 | Katharine Berkoff | United States | 59.04 | Q |
| 4 | 7 | 5 | Kylie Masse | Canada | 59.14 | Q |
| 5 | 6 | 3 | Wan Letian | China | 59.52 | Q |
| 6 | 7 | 2 | Pauline Mahieu | France | 59.60 | Q |
| 7 | 6 | 6 | Maaike de Waard | Netherlands | 59.89 | Q |
| 8 | 5 | 5 | Wang Xueer | China | 59.93 | Q |
| 9 | 6 | 5 | Ingrid Wilm | Canada | 59.96 | Q |
| 10 | 5 | 7 | Madison Wilson | Australia | 1:00.04 | Q |
| 11 | 6 | 1 | Lauren Cox | Great Britain | 1:00.10 | Q |
| 12 | 7 | 6 | Medi Harris | Great Britain | 1:00.11 | Q |
| 13 | 5 | 3 | Margherita Panziera | Italy | 1:00.40 | Q |
| 14 | 5 | 1 | Simona Kubová | Czech Republic | 1:00.45 | Q |
| 15 | 7 | 0 | Hanna Rosvall | Sweden | 1:00.46 | Q |
| 15 | 7 | 3 | Kira Toussaint | Netherlands | 1:00.46 | Q |
| 17 | 5 | 2 | Adela Piskorska | Poland | 1:00.51 | |
| 18 | 6 | 8 | Lee Eun-ji | South Korea | 1:00.56 | |
| 19 | 4 | 4 | Helena Gasson | New Zealand | 1:00.83 | |
| 19 | 7 | 1 | Rio Shirai | Japan | 1:00.83 | |
| 21 | 7 | 7 | Carmen Weiler | Spain | 1:00.87 | |
| 22 | 5 | 6 | Roos Vanotterdijk | Belgium | 1:00.95 | |
| 23 | 7 | 9 | Stephanie Au | Hong Kong | 1:01.08 | |
| 24 | 6 | 0 | Camila Rebelo | Portugal | 1:01.27 | |
| 25 | 5 | 8 | Ingeborg Løyning | Norway | 1:01.32 | |
| 26 | 6 | 2 | Paulina Peda | Poland | 1:01.40 | |
| 27 | 7 | 8 | Danielle Hill | Ireland | 1:01.51 | |
| 28 | 4 | 3 | Aviv Barzelay | Israel | 1:01.66 | |
| 28 | 4 | 6 | Gabriela Georgieva | Bulgaria | 1:01.66 | |
| 30 | 6 | 7 | Analia Pigrée | France | 1:01.67 | |
| 31 | 6 | 9 | Nina Kost | Switzerland | 1:02.03 | |
| 32 | 4 | 1 | Xeniya Ignatova | Kazakhstan | 1:02.34 | |
| 32 | 4 | 5 | Andrea Berrino | Argentina | 1:02.34 | |
| 34 | 5 | 0 | Dóra Molnár | Hungary | 1:02.62 | |
| 35 | 4 | 8 | Milla Drakopoulos | South Africa | 1:02.77 | |
| 36 | 4 | 7 | Julia Góes | Brazil | 1:02.87 | |
| 37 | 5 | 9 | Miranda Grana | Mexico | 1:02.91 | |
| 38 | 3 | 4 | McKenna DeBever | Peru | 1:03.12 | |
| 39 | 4 | 9 | Emma Harvey | Bermuda | 1:03.14 | |
| 40 | 4 | 2 | Tatiana Salcuțan | Moldova | 1:03.18 | |
| 41 | 3 | 5 | Elizabeth Jiménez | Dominican Republic | 1:03.45 | |
| 42 | 3 | 1 | Andrea Becali | Cuba | 1:04.27 | |
| 43 | 3 | 6 | Danielle Titus | Barbados | 1:04.40 | |
| 44 | 3 | 3 | Saovanee Boonamphai | Thailand | 1:04.53 | |
| 45 | 4 | 0 | Abril Aunchayna | Uruguay | 1:04.66 | |
| 46 | 3 | 2 | Carolina Cermelli | Panama | 1:04.85 | |
| 46 | 3 | 8 | Donata Katai | Zimbabwe | 1:04.85 | |
| 48 | 3 | 0 | Ganga Malwaththage | Sri Lanka | 1:04.86 | |
| 49 | 3 | 7 | Anishta Teeluck | Mauritius | 1:05.32 | |
| 50 | 1 | 3 | Felicity Passon | Seychelles | 1:05.35 | |
| 51 | 1 | 4 | Gaurika Singh | Nepal | 1:06.80 | |
| 52 | 3 | 9 | Eda Zeqiri | Kosovo | 1:07.17 | |
| 53 | 2 | 5 | Ariuntamir Enkh-Amgalan | Mongolia | 1:08.59 | NR |
| 54 | 2 | 1 | Cheang Weng Lam | Macau | 1:08.60 | |
| 55 | 2 | 4 | Aynura Primova | Turkmenistan | 1:08.97 | |
| 56 | 2 | 8 | Idealy Tendrinavalona | Madagascar | 1:10.29 | |
| 57 | 2 | 3 | Chanchakriya Kheun | Cambodia | 1:10.51 | |
| 58 | 2 | 6 | Jennifer Harding-Marlin | Saint Kitts and Nevis | 1:12.19 | |
| 59 | 1 | 5 | Abigail Ai Tom | Papua New Guinea | 1:14.69 | |
| 60 | 2 | 2 | Hamna Ahmed | Maldives | 1:18.17 | NR |
| 61 | 2 | 7 | Ammara Pinto | Malawi | 1:22.06 | |

### Semifinals

The semifinals were started on 24 July at 20:53.
| Rank | Heat | Lane | Name | Nationality | Time | Notes |
| 1 | 2 | 4 | Regan Smith | United States | 58.33 | Q |
| 2 | 1 | 4 | Kaylee McKeown | Australia | 58.48 | Q |
| 3 | 2 | 5 | Katharine Berkoff | United States | 58.60 | Q |
| 4 | 1 | 5 | Kylie Masse | Canada | 59.06 | Q |
| 5 | 1 | 3 | Pauline Mahieu | France | 59.30 | Q, NR |
| 6 | 2 | 2 | Ingrid Wilm | Canada | 59.35 | Q |
| 7 | 2 | 3 | Wan Letian | China | 59.49 | Q |
| 8 | 1 | 7 | Medi Harris | Great Britain | 59.62 | Q |
| 9 | 1 | 2 | Madison Wilson | Australia | 59.63 | |
| 10 | 2 | 7 | Lauren Cox | Great Britain | 59.79 | |
| 11 | 2 | 6 | Maaike de Waard | Netherlands | 59.84 | |
| 12 | 1 | 8 | Kira Toussaint | Netherlands | 59.89 | |
| 13 | 1 | 6 | Wang Xueer | China | 59.96 | |
| 14 | 1 | 1 | Simona Kubová | Czech Republic | 1:00.43 | |
| 15 | 2 | 8 | Hanna Rosvall | Sweden | 1:00.65 | |
| 16 | 2 | 1 | Margherita Panziera | Italy | 1:01.31 | |

### Final

The final was held on 25 July at 20:51.
| Rank | Lane | Name | Nationality | Time | Notes |
| | 5 | Kaylee McKeown | Australia | 57.53 | CR |
| | 4 | Regan Smith | United States | 57.78 | |
| | 3 | Katharine Berkoff | United States | 58.25 | |
| 4 | 6 | Kylie Masse | Canada | 59.09 | |
| 5 | 7 | Ingrid Wilm | Canada | 59.31 | |
| 6 | 2 | Pauline Mahieu | France | 59.72 | |
| 7 | 8 | Medi Harris | Great Britain | 59.84 | |
| 8 | 1 | Wan Letian | China | 1:00.39 | |