# Swimming at the 2024 World Aquatics Championships – Women's 100 metre breaststroke

The Women's 100 metre breaststroke competition at the 2024 World Aquatics Championships was held on 12 and 13 February 2024.

## Records

Prior to the competition, the existing world and championship records were as follows.
| World record | Lilly King (USA) | 1:04.13 | Budapest, Hungary | 25 July 2017 |
| Competition record | Lilly King (USA) | 1:04.13 | Budapest, Hungary | 25 July 2017 |

## Results
### Heats

The heats were started on 12 February at 10:04.
| Rank | Heat | Lane | Name | Nationality | Time | Notes |
| 1 | 5 | 7 | Tang Qianting | China | 1:06.16 | Q |
| 2 | 4 | 4 | Tes Schouten | Netherlands | 1:06.46 | Q |
| 3 | 5 | 4 | Mona McSharry | Ireland | 1:06.49 | Q |
| 4 | 6 | 7 | Alina Zmushka | Neutral Independent Athletes | 1:06.77 | Q |
| 5 | 5 | 3 | Yang Chang | China | 1:06.80 | Q |
| 6 | 6 | 2 | Kotryna Teterevkova | Lithuania | 1:06.85 | Q |
| 7 | 6 | 3 | Letitia Sim | Singapore | 1:06.97 | Q |
| 8 | 6 | 6 | Dominika Sztandera | Poland | 1:07.17 | Q |
| 9 | 4 | 5 | Sophie Hansson | Sweden | 1:07.19 | Q |
| 10 | 6 | 5 | Benedetta Pilato | Italy | 1:07.24 | Q |
| 11 | 5 | 1 | Sophie Angus | Canada | 1:07.37 | Q |
| 12 | 5 | 5 | Siobhán Haughey | Hong Kong | 1:07.41 | Q |
| 13 | 4 | 3 | Arianna Castiglioni | Italy | 1:07.48 | Q |
| 14 | 4 | 6 | Macarena Ceballos | Argentina | 1:07.61 | Q |
| 14 | 5 | 6 | Lara van Niekerk | South Africa | 1:07.61 | Q |
| 16 | 4 | 2 | Lisa Mamié | Switzerland | 1:07.75 | Q |
| 17 | 6 | 4 | Rūta Meilutytė | Lithuania | 1:07.79 | |
| 18 | 6 | 1 | Piper Enge | United States | 1:08.14 | |
| 19 | 4 | 1 | Ida Hulkko | Finland | 1:08.21 | |
| 20 | 6 | 8 | Stefanía Gómez | Colombia | 1:08.67 | |
| 21 | 4 | 7 | Jimena Ruiz | Spain | 1:08.74 | |
| 22 | 4 | 0 | Ana Blažević | Croatia | 1:08.88 | |
| 23 | 4 | 8 | Melissa Rodríguez | Mexico | 1:08.91 | |
| 24 | 3 | 5 | Kristýna Horská | Czech Republic | 1:08.95 | |
| 25 | 5 | 2 | Abbey Harkin | Australia | 1:09.01 | |
| 26 | 3 | 8 | Thanya Dela Cruz | Philippines | 1:09.12 | |
| 27 | 5 | 8 | Ana Rodrigues | Portugal | 1:09.82 | |
| 28 | 3 | 4 | Moon Su-a | South Korea | 1:09.93 | |
| 29 | 3 | 3 | Emily Santos | Panama | 1:09.96 | |
| 30 | 3 | 2 | Adelaida Pchelintseva | Kazakhstan | 1:10.16 | |
| 31 | 5 | 9 | Silje Slyngstadli | Norway | 1:10.42 | |
| 32 | 6 | 0 | Lin Pei-wun | Chinese Taipei | 1:10.77 | |
| 33 | 5 | 0 | Ana Carolina Vieira | Brazil | 1:10.83 | |
| 34 | 3 | 0 | Lanihei Connolly | Cook Islands | 1:10.87 | |
| 35 | 3 | 6 | Phee Jinq En | Malaysia | 1:11.31 | |
| 36 | 6 | 9 | Tara Vovk | Slovenia | 1:11.81 | |
| 37 | 3 | 1 | Chen Pui Lam | Macau | 1:12.08 | |
| 38 | 2 | 4 | Rhanishka Gibbs | Bahamas | 1:12.27 | |
| 39 | 3 | 7 | Nicole Frank | Uruguay | 1:12.81 | |
| 40 | 2 | 2 | Marina Abu Shamaleh | Palestine | 1:14.15 | |
| 41 | 1 | 6 | Tessa Ip Hen Cheung | Mauritius | 1:14.25 | |
| 42 | 3 | 9 | Imane El Barodi | Morocco | 1:14.55 | |
| 43 | 2 | 3 | Ellie Shaw | Antigua and Barbuda | 1:15.20 | |
| 44 | 2 | 5 | Kelera Mudunasoko | Fiji | 1:15.64 | |
| 45 | 2 | 6 | Tara Aloul | Jordan | 1:15.87 | |
| 46 | 2 | 7 | Naiara Roca | Bolivia | 1:16.41 | |
| 47 | 2 | 1 | Lara Dashti | Kuwait | 1:18.83 | |
| 48 | 2 | 8 | Maria Battalones | Northern Mariana Islands | 1:19.79 | |
| 49 | 1 | 5 | Hayley Wong | Brunei | 1:20.28 | |
| 50 | 2 | 0 | Makelyta Singsombath | Laos | 1:23.98 | |
| 51 | 2 | 9 | Taeyanna Adams | Micronesia | 1:24.70 | |
| 52 | 1 | 3 | Troya Pina | Cape Verde | 1:25.17 | |
| 53 | 1 | 4 | Mariama Touré | Guinea | 1:37.98 | |
| | 4 | 9 | Martina Bukvić | Serbia | Did not start | Did not start |

### Semifinals

The semifinals were held on 12 February at 19:28.
| Rank | Heat | Lane | Name | Nationality | Time | Notes |
| 1 | 2 | 4 | Tang Qianting | China | 1:05.36 | Q |
| 2 | 2 | 5 | Mona McSharry | Ireland | 1:06.11 | Q |
| 3 | 2 | 3 | Yang Chang | China | 1:06.27 | Q |
| 4 | 1 | 4 | Tes Schouten | Netherlands | 1:06.30 | Q |
| 5 | 1 | 7 | Siobhán Haughey | Hong Kong | 1:06.41 | Q |
| 6 | 1 | 5 | Alina Zmushka | Neutral Independent Athletes | 1:06.53 | Q |
| 7 | 1 | 3 | Kotryna Teterevkova | Lithuania | 1:06.61 | Q |
| 8 | 2 | 7 | Sophie Angus | Canada | 1:06.66 | Q |
| 9 | 1 | 2 | Benedetta Pilato | Italy | 1:06.70 | |
| 10 | 2 | 2 | Sophie Hansson | Sweden | 1:06.78 | |
| 11 | 2 | 6 | Letitia Sim | Singapore | 1:07.14 | |
| 12 | 1 | 6 | Dominika Sztandera | Poland | 1:07.20 | |
| 13 | 2 | 8 | Lara van Niekerk | South Africa | 1:07.25 | |
| 14 | 1 | 8 | Lisa Mamié | Switzerland | 1:07.48 | |
| 15 | 1 | 1 | Macarena Ceballos | Argentina | 1:07.49 | |
| 16 | 2 | 1 | Arianna Castogiloni | Italy | 1:07.57 | |

### Final

The final was held on 13 February at 20:45.
| Rank | Lane | Name | Nationality | Time | Notes |
| | 4 | Tang Qianting | China | 1:05.27 | NR |
| | 6 | Tes Schouten | Netherlands | 1:05.82 | |
| | 2 | Siobhán Haughey | Hong Kong | 1:05.92 | NR |
| 4 | 1 | Kotryna Teterevkova | Lithuania | 1:06.02 | |
| 5 | 5 | Mona McSharry | Ireland | 1:06.42 | |
| 6 | 7 | Alina Zmushka | Neutral Independent Athletes | 1:06.58 | |
| 7 | 3 | Yang Chang | China | 1:06.75 | |
| 8 | 8 | Sophie Angus | Canada | 1:07.09 | |