# 2024 World Aquatics Swimming Championships (25 m) – Women's 100 metre backstroke

The Women's 100 metre backstroke competition of the 2024 World Aquatics Swimming Championships (25 m) was held on 10 and 11 December 2024.

## Records

Prior to the competition, the existing world and championship records were as follows.
| World record | Regan Smith (USA) | 54.27 | Singapore | 1 November 2024 |
| Competition record | Katinka Hosszu (HUN) | 55.03 | Doha, Qatar | 4 December 2014 |
The following record was established during the competition:
| Date | Event | Name | Nationality | Time | Record |
| 11 December | Final | Regan Smith | United States | 54.55 | CR |

## Results
### Heats

The heats were started on 10 December at 9:32.
| Rank | Heat | Lane | Name | Nationality | Time | Notes |
| 1 | 7 | 4 | Regan Smith | United States | 55.86 | Q |
| 2 | 6 | 4 | Iona Anderson | Australia | 56.25 | Q |
| 3 | 6 | 2 | Katharine Berkoff | United States | 56.33 | Q |
| 4 | 6 | 5 | Anastasiya Shkurdai | Neutral Athletes A | 56.50 | Q |
| 5 | 6 | 7 | Kylie Masse | Canada | 56.58 | Q |
| 6 | 7 | 5 | Ingrid Wilm | Canada | 56.66 | Q |
| 7 | 6 | 0 | Carmen Weiler | Spain | 56.68 | Q, NR |
| 8 | 5 | 5 | Qian Xinan | China | 56.69 | Q |
| 9 | 6 | 9 | Miranda Grana | Neutral Athletes C | 56.83 | Q, NR |
| 10 | 6 | 3 | Maaike de Waard | Netherlands | 57.01 | Q |
| 11 | 5 | 3 | Louise Hansson | Sweden | 57.14 | Q |
| 12 | 7 | 3 | Pauline Mahieu | France | 57.18 | Q |
| 13 | 6 | 6 | Hanna Rosvall | Sweden | 57.26 | Q |
| 14 | 7 | 6 | Mizuki Hirai | Japan | 57.29 | Q |
| 15 | 5 | 2 | Helena Gasson | New Zealand | 57.43 | Q |
| 16 | 5 | 6 | Zheng Huiyu | China | 57.52 | Q |
| 17 | 5 | 4 | Kira Toussaint | Netherlands | 57.55 | R |
| 18 | 7 | 7 | Giulia D'Innocenzo | Italy | 57.82 | R |
| 19 | 7 | 2 | Danielle Hill | Ireland | 57.95 | |
| 20 | 5 | 7 | Elizaveta Agapitova | Neutral Athletes B | 58.19 | |
| 21 | 5 | 0 | Adela Piskorska | Poland | 58.31 | |
| 22 | 7 | 1 | Milana Stepanova | Neutral Athletes B | 58.47 | |
| 23 | 4 | 4 | Xeniya Ignatova | Kazakhstan | 59.01 | |
| 24 | 7 | 0 | Gabriela Georgieva | Bulgaria | 59.06 | |
| 25 | 4 | 5 | Fanny Teijonsalo | Finland | 59.27 | |
| 26 | 6 | 8 | Milla Drakopoulos | South Africa | 59.33 | |
| 27 | 5 | 1 | Dora Molnar | Hungary | 59.37 | |
| 28 | 6 | 1 | Aissia Prisecariu | Romania | 59.39 | |
| 29 | 4 | 1 | Abril Aunchayna | Uruguay | 59.56 | NR |
| 29 | 4 | 3 | Justine Murdock | Lithuania | 59.56 | NR |
| 31 | 7 | 9 | Chloe Isleta | Philippines | 59.71 | |
| 32 | 5 | 8 | Cindy Cheung | Hong Kong | 59.89 | |
| 33 | 7 | 8 | Kim Seung-won | South Korea | 59.95 | |
| 34 | 4 | 6 | Carla González | Venezuela | 1:00.11 | |
| 35 | 4 | 2 | Zuri Ferguson | Trinidad and Tobago | 1:00.12 | NR |
| 36 | 3 | 7 | Masniari Wolf | Indonesia | 1:00.43 | NR |
| 37 | 3 | 5 | Teresa Ivan | Slovakia | 1:00.45 | |
| 38 | 3 | 4 | Elizabeth Jiménez | Dominican Republic | 1:00.57 | |
| 39 | 4 | 0 | Laurent Estrada | Cuba | 1:00.74 | |
| 40 | 5 | 9 | Nika Sharafutdinova | Ukraine | 1:00.79 | |
| 41 | 2 | 4 | Jessica Humphrey | Namibia | 1:00.95 | |
| 42 | 4 | 9 | Melissa Diego | Guatemala | 1:01.23 | NR |
| 43 | 4 | 8 | Danielle Titus | Barbados | 1:01.58 | |
| 44 | 3 | 6 | Logan Watson-Brown | Bermuda | 1:01.68 | |
| 45 | 3 | 2 | Elisabeth Erlendsdóttir | Faroe Islands | 1:02.60 | |
| 46 | 2 | 7 | Ashley Calderón | Honduras | 1:02.83 | NR |
| 47 | 2 | 5 | Lara Giménez | Paraguay | 1:03.10 | NR |
| 48 | 3 | 1 | Anishta Teeluck | Mauritius | 1:03.40 | |
| 49 | 3 | 3 | Natalia Zaiteva | Moldova | 1:03.41 | |
| 50 | 2 | 3 | Taline Mourad | Lebanon | 1:03.54 | NR |
| 51 | 2 | 2 | Leanna Wainwright | Jamaica | 1:04.18 | NR |
| 52 | 3 | 8 | Ganga Senavirathne | Sri Lanka | 1:04.40 | |
| 53 | 4 | 7 | Enkh-Amgalangiin Ariuntamir | Mongolia | 1:04.46 | |
| 54 | 3 | 0 | Wong Un Iao | Macau | 1:04.64 | |
| 55 | 3 | 9 | Mia Laban | Cook Islands | 1:04.96 | |
| 56 | 2 | 6 | Idealy Tendrinavalona | Madagascar | 1:05.59 | NR |
| 57 | 2 | 8 | Aaliyah Palestrini | Seychelles | 1:06.67 | |
| 58 | 2 | 1 | Nubia Adjei | Ghana | 1:07.58 | |
| 59 | 1 | 3 | Piper Raho | Northern Mariana Islands | 1:09.62 | |
| 60 | 1 | 5 | Juthi Akter | Bangladesh | 1:11.25 | NR |
| 61 | 2 | 0 | Ammara Pinto | Malawi | 1:17.28 | |
| 62 | 1 | 4 | Aliyana Kachra | Tanzania | 1:22.52 | |
| 63 | 2 | 9 | Chloe Ameara | Vanuatu | 1:25.21 | |

### Semifinals

The semifinals were started on 10 December at 18:24.
| Rank | Heat | Lane | Name | Nationality | Time | Notes |
| 1 | 2 | 4 | Regan Smith | United States | 55.05 | Q |
| 2 | 2 | 5 | Katharine Berkoff | United States | 55.37 | Q |
| 3 | 1 | 3 | Ingrid Wilm | Canada | 55.85 | Q |
| 4 | 1 | 4 | Iona Anderson | Australia | 55.99 | Q |
| 5 | 2 | 3 | Kylie Masse | Canada | 56.06 | Q |
| 6 | 1 | 5 | Anastasiya Shkurdai | Neutral Athletes A | 56.07 | Q, NR |
| 7 | 2 | 6 | Carmen Weiler | Spain | 56.09 | Q, NR |
| 8 | 2 | 7 | Louise Hansson | Sweden | 56.17 | Q |
| 9 | 1 | 7 | Pauline Mahieu | France | 56.36 | R |
| 10 | 2 | 2 | Miranda Grana | Neutral Athletes C | 56.62 | R, NR |
| 11 | 1 | 6 | Qian Xinan | China | 56.79 | |
| 12 | 1 | 2 | Maaike de Waard | Netherlands | 56.94 | |
| 13 | 2 | 1 | Hanna Rosvall | Sweden | 57.24 | |
| 14 | 1 | 1 | Mizuki Hirai | Japan | 57.44 | |
| 15 | 2 | 8 | Helena Gasson | New Zealand | 57.64 | |
| 16 | 1 | 8 | Zheng Huiyu | China | 58.07 | |

### Final

The final was held on 11 December at 17:32.
| Rank | Lane | Name | Nationality | Time | Notes |
| | 4 | Regan Smith | United States | 54.55 | CR |
| | 5 | Katharine Berkoff | United States | 54.93 | |
| | 3 | Ingrid Wilm | Canada | 55.75 | |
| 4 | 6 | Iona Anderson | Australia | 56.08 | |
| 5 | 7 | Anastasiya Shkurdai | Neutral Athletes A | 56.11 | |
| 6 | 2 | Kylie Masse | Canada | 56.21 | |
| 7 | 1 | Carmen Weiler | Spain | 56.39 | |
| 8 | 8 | Louise Hansson | Sweden | 56.52 | |