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

The Women's 100 metre individual medley competition of the 2024 World Aquatics Swimming Championships (25 m) was held on 12 and 13 December 2024.

## Records

Prior to the competition, the existing world and championship records were as follows.
| World record | Gretchen Walsh (USA) | 55.98 | Charlottesville, United States | 18 October 2024 |
| Competition record | Katinka Hosszú (HUN) | 56.70 | Doha, Qatar | 5 December 2014 |
The following records were established during the competition:
| Date | Event | Name | Nationality | Time | Record |
| 12 December | Heat 4 | Gretchen Walsh | United States | 56.06 | CR |
| 12 December | Semifinal 2 | Gretchen Walsh | United States | 55.71 | WR, CR |
| 13 December | Final | Gretchen Walsh | United States | 55.11 | WR, CR |

## Results
### Heats

The heats were started on 12 December at 10:07.
| Rank | Heat | Lane | Name | Nationality | Time | Notes |
| 1 | 4 | 4 | Gretchen Walsh | United States | 56.06 | Q, CR |
| 2 | 3 | 4 | Kate Douglass | United States | 56.98 | Q |
| 3 | 2 | 3 | Tessa Giele | Netherlands | 57.87 | Q |
| 4 | 4 | 5 | Mary-Sophie Harvey | Canada | 58.21 | Q |
| 5 | 4 | 6 | Rebecca Meder | South Africa | 58.44 | Q, AF |
| 6 | 2 | 4 | Béryl Gastaldello | France | 58.58 | Q |
| 7 | 3 | 3 | Diana Petkova | Bulgaria | 58.79 | Q, NR |
| 8 | 3 | 7 | Ellen Walshe | Ireland | 58.85 | Q, NR |
| 9 | 2 | 5 | Sydney Pickrem | Canada | 58.92 | Q |
| 10 | 2 | 6 | Tamara Potocká | Slovakia | 58.95 | Q, NR |
| 11 | 3 | 5 | Louise Hansson | Sweden | 59.02 | Q |
| 12 | 2 | 2 | Helena Gasson | New Zealand | 59.14 | Q |
| 13 | 4 | 1 | Barbora Janíčková | Czech Republic | 59.25 | Q, NR |
| 14 | 3 | 2 | Zheng Huiyu | China | 59.58 | Q |
| 15 | 4 | 8 | Fernanda Gomes Celidonio | Brazil | 59.78 | Q, NR |
| 16 | 2 | 1 | Anastasiya Kuliashova | Neutral Athletes A | 59.82 | Q |
| 17 | 2 | 7 | Qian Xinan | China | 1:00.01 | R |
| =18 | 3 | 6 | Iona Anderson | Australia | 1:00.06 | R |
| =18 | 3 | 8 | Stefanía Gómez | Colombia | 1:00.06 | R |
| 20 | 4 | 2 | Chiara Della Corte | Italy | 1:00.14 | |
| =21 | 3 | 1 | Emma Carrasco | Spain | 1:00.19 | |
| =21 | 4 | 3 | Lena Kreundl | Austria | 1:00.19 | |
| 23 | 4 | 0 | Kristen Romano | Puerto Rico | 1:00.76 | NR |
| 24 | 4 | 9 | Maria Romanjuk | Estonia | 1:00.80 | |
| 25 | 2 | 8 | Adela Piskorska | Poland | 1:01.27 | |
| 26 | 2 | 0 | Chloe Isleta | Philippines | 1:01.89 | |
| 27 | 3 | 9 | Valerie Rose Tarazi | Palestine | 1:02.00 | |
| 28 | 1 | 4 | Tam Hoi Lam | Hong Kong | 1:02.41 | |
| 29 | 1 | 2 | Vala Cicero | Iceland | 1:03.06 | |
| 30 | 4 | 7 | Fanny Teijonsalo | Finland | 1:03.27 | |
| 31 | 2 | 9 | Alexis Margett | Bolivia | 1:04.38 | |
| 32 | 1 | 7 | Wilina Jules-Marthe | Cape Verde | 1:05.84 | |
| 33 | 1 | 6 | Molina Smalley | Namibia | 1:06.01 | |
| 34 | 1 | 5 | M.C.A. Batallones | Northern Mariana Islands | 1:08.46 | |
| 35 | 1 | 3 | Chloe Ameara | Vanuatu | 1:25.47 | |
| | 3 | 0 | Lora Komoróczy | Hungary | Did not start | Did not start |

### Semifinals

The semifinals were started on 12 December at 18:52.
| Rank | Heat | Lane | Name | Nationality | Time | Notes |
| 1 | 2 | 4 | Gretchen Walsh | United States | 55.71 | Q, WR |
| 2 | 1 | 4 | Kate Douglass | United States | 56.88 | Q |
| 3 | 1 | 5 | Mary-Sophie Harvey | Canada | 57.19 | Q |
| 4 | 2 | 3 | Rebecca Meder | South Africa | 57.69 | Q, AF |
| 5 | 2 | 5 | Tessa Giele | Netherlands | 57.70 | Q |
| 6 | 1 | 3 | Béryl Gastaldello | France | 57.73 | Q |
| 7 | 2 | 6 | Diana Petkova | Bulgaria | 58.28 | Q |
| 8 | 2 | 2 | Sydney Pickrem | Canada | 58.47 | Q |
| 9 | 1 | 6 | Ellen Walshe | Ireland | 58.55 | R, NR |
| 10 | 2 | 7 | Louise Hansson | Sweden | 58.67 | R |
| 11 | 1 | 7 | Helena Gasson | New Zealand | 58.70 | |
| =12 | 1 | 2 | Tamara Potocká | Slovakia | 59.31 | |
| =12 | 2 | 1 | Barbora Janíčková | Czech Republic | 59.31 | |
| 14 | 1 | 1 | Zheng Huiyu | China | 59.34 | |
| 15 | 2 | 8 | Fernanda Gomes Celidonio | Brazil | 59.58 | NR |
| 16 | 1 | 8 | Anastasiya Kuliashova | Neutral Athletes A | 1:00.26 | |

### Final

The final was held on 13 December at 18:51.
| Rank | Lane | Name | Nationality | Time | Notes |
| | 4 | Gretchen Walsh | United States | 55.11 | WR |
| | 5 | Kate Douglass | United States | 56.49 | |
| | 7 | Béryl Gastaldello | France | 56.67 | NR |
| 4 | 3 | Mary-Sophie Harvey | Canada | 57.04 | |
| 5 | 2 | Tessa Giele | Netherlands | 57.69 | |
| 6 | 6 | Rebecca Meder | South Africa | 58.10 | |
| 7 | 1 | Diana Petkova | Bulgaria | 58.73 | |
| 8 | 8 | Sydney Pickrem | Canada | 59.07 | |