# 2021 FINA World Swimming Championships (25 m) – Women's 100 metre freestyle

The Women's 100 metre freestyle competition of the 2021 FINA World Swimming Championships (25 m) was held on 17 and 18 December 2021.

## Records

Prior to the competition, the existing world and championship records were as follows.
| World record | Cate Campbell (AUS) | 50.25 | Adelaide, Australia | 26 October 2017 |
| Competition record | Ranomi Kromowidjojo (NED) | 51.14 | Hangzhou, China | 13 December 2018 |
The following new records were set during this competition:
| Date | Event | Name | Nation | Time | Record |
| 18 December | Final | Siobhán Haughey | Hong Kong | 50.98 | CR |

## Results
### Heats

The heats were started on 17 December at 10:03.
| Rank | Heat | Lane | Name | Nationality | Time | Notes |
| 1 | 9 | 4 | Siobhán Haughey | Hong Kong | 51.97 | Q |
| 2 | 8 | 4 | Sarah Sjöström | Sweden | 52.21 | Q |
| 3 | 8 | 3 | Kayla Sanchez | Canada | 52.38 | Q |
| 4 | 7 | 4 | Abbey Weitzeil | United States | 52.81 | Q |
| 5 | 8 | 5 | Katarzyna Wasick | Poland | 52.98 | Q |
| 6 | 9 | 5 | Freya Anderson | Great Britain | 53.02 | Q |
| 7 | 7 | 5 | Marie Wattel | France | 53.32 | Q |
| 8 | 9 | 9 | Torri Huske | United States | 53.34 | Q |
| 9 | 9 | 6 | Michelle Coleman | Sweden | 53.41 | Q |
| 10 | 8 | 0 | Zhu Menghui | China | 53.47 | Q |
| 11 | 9 | 2 | Lucy Hope | Great Britain | 53.49 | Q |
| 12 | 8 | 6 | Charlotte Bonnet | France | 53.50 | Q |
| 13 | 7 | 3 | Marrit Steenbergen | Netherlands | 53.51 | Q |
| 14 | 7 | 6 | Julie Kepp Jensen | Denmark | 53.63 | Q |
| 15 | 8 | 1 | Rebecca Smith | Canada | 53.70 | Q |
| 16 | 7 | 8 | Cheng Yujie | China | 53.86 | Q |
| 17 | 9 | 8 | Janja Šegel | Slovenia | 53.95 | |
| 18 | 6 | 4 | Laura Littlejohn | New Zealand | 53.96 | |
| 19 | 5 | 4 | Diana Petkova | Bulgaria | 54.05 | |
| 20 | 7 | 7 | Costanza Cocconcelli | Italy | 54.07 | |
| 20 | 9 | 7 | Ekaterina Nikonova | Russian Swimming Federation | 54.07 | |
| 22 | 6 | 3 | Holly Barratt | Australia | 54.18 | |
| 23 | 6 | 1 | Kalia Antoniou | Cyprus | 54.29 | NR |
| 24 | 8 | 2 | Kim Busch | Netherlands | 54.32 | |
| 25 | 6 | 5 | Fanni Gyurinovics | Hungary | 54.39 | |
| 25 | 8 | 7 | Fanny Teijonsalo | Finland | 54.39 | |
| 27 | 6 | 8 | Farida Osman | Egypt | 54.42 | NR |
| 28 | 7 | 2 | Annika Bruhn | Germany | 54.50 | |
| 29 | 6 | 2 | Kim Seo-yeong | South Korea | 54.83 | |
| 30 | 5 | 3 | Bianca Costea | Romania | 54.84 | |
| 31 | 9 | 0 | Danielle Hill | Ireland | 54.98 | |
| 32 | 9 | 1 | Julie Meynen | Luxembourg | 55.09 | |
| 33 | 7 | 1 | Marie Pietruschka | Germany | 55.24 | |
| 34 | 6 | 6 | Jóhanna Elín Guðmundsdóttir | Iceland | 55.27 | |
| 35 | 6 | 7 | Ieva Maļuka | Latvia | 55.30 | |
| 36 | 5 | 2 | Amel Melih | Algeria | 55.34 | NR |
| 37 | 6 | 0 | Jana Pavalić | Croatia | 55.45 | |
| 38 | 7 | 9 | Nina Stanisavljević | Serbia | 55.52 | |
| 39 | 7 | 0 | Cornelia Pammer | Austria | 55.71 | |
| 40 | 5 | 6 | Maddy Moore | Bermuda | 55.72 | |
| 41 | 5 | 7 | Krystal Lara | Dominican Republic | 55.81 | NR |
| 42 | 5 | 8 | Inés Marín | Chile | 55.99 | NR |
| 43 | 5 | 5 | Kornkarnjana Sapianchai | Thailand | 56.29 | |
| 44 | 5 | 1 | Mia Blaževska Eminova | North Macedonia | 56.55 | |
| 45 | 4 | 5 | María Schutzmeier | Nicaragua | 56.97 | |
| 46 | 8 | 8 | Selen Özbilen | Turkey | 57.07 | |
| 47 | 5 | 9 | Isabella Alas | El Salvador | 57.22 | NR |
| 48 | 3 | 5 | Batbayaryn Enkhkhüslen | Mongolia | 57.25 | |
| 49 | 4 | 3 | Chloe Farro | Aruba | 57.57 | |
| 50 | 4 | 1 | Alison Jackson | Cayman Islands | 57.70 | |
| 51 | 5 | 0 | Mònica Ramírez | Andorra | 58.24 | |
| 52 | 4 | 0 | Leiya Istambouli | Lebanon | 58.52 | |
| 53 | 4 | 2 | Lina Khiyara | Morocco | 58.62 | |
| 54 | 1 | 2 | Alisa Bech Vestergård | Faroe Islands | 58.83 | |
| 55 | 4 | 8 | Catarina Sousa | Angola | 58.88 | |
| 56 | 4 | 7 | Jeanne Boutbien | Senegal | 58.96 | |
| 57 | 1 | 7 | Tessa Ip Hen Cheung | Mauritius | 59.34 | |
| 58 | 4 | 6 | Colleen Furgeson | Marshall Islands | 59.35 | NR |
| 59 | 4 | 9 | Ani Poghosyan | Armenia | 59.56 | |
| 60 | 3 | 1 | Aleka Persaud | Guyana | 59.70 | |
| 61 | 4 | 4 | Gabriela Santis | Guatemala | 59.93 | |
| 62 | 3 | 3 | Mariam Imnadze | Georgia | 1:00.12 | |
| 63 | 3 | 9 | Jehanara Nabi | Pakistan | 1:00.37 | |
| 64 | 3 | 6 | Andela Antunović | Montenegro | 1:00.52 | |
| 65 | 3 | 2 | Bhakthi Karunasena | Sri Lanka | 1:01.32 | |
| 66 | 3 | 8 | Mona Kilani | Jordan | 1:01.33 | |
| 67 | 3 | 0 | Mya de Freitas | Saint Vincent and the Grenadines | 1:02.05 | |
| 68 | 1 | 0 | Viktoriia Kutuzova | Kyrgyzstan | 1:02.60 | |
| 68 | 3 | 7 | Fjorda Shabani | Kosovo | 1:02.60 | |
| 70 | 2 | 5 | Khema Elizabeth | Seychelles | 1:02.76 | |
| 71 | 2 | 6 | Anushiya Tandukar | Nepal | 1:02.77 | |
| 72 | 2 | 3 | Ammara Pinto | Malawi | 1:03.60 | |
| 73 | 2 | 1 | Ekaterina Bordachyova | Tajikistan | 1:03.93 | |
| 74 | 2 | 2 | Charissa Panuve | Tonga | 1:03.95 | |
| 75 | 1 | 6 | Sonia Aktar | Bangladesh | 1:05.06 | |
| 76 | 1 | 1 | Jourdyn Adams | Federated States of Micronesia | 1:05.25 | |
| 77 | 2 | 4 | Mineri Gomez | Guam | 1:05.54 | |
| 78 | 1 | 3 | Asaka Litulumar | Northern Mariana Islands | 1:06.30 | |
| 79 | 2 | 7 | Nafissath Radji | Benin | 1:06.31 | |
| 80 | 1 | 9 | Yuri Hosei | Palau | 1:09.57 | |
| 81 | 1 | 5 | Abbi Illis | Sint Maarten | 1:14.97 | |
| 82 | 2 | 9 | Imelda Ximenes Belo | Timor-Leste | 1:15.12 | |
| 83 | 2 | 8 | Darcelle Ishimwe | Burundi | 1:15.64 | |
| 84 | 1 | 4 | Haneen Ibrahim | Sudan | 1:16.29 | |
| 85 | 1 | 8 | Naima-Zahra Amison | Djibouti | 1:25.01 | |
| | 2 | 0 | Ria Save | Tanzania | DNS | |
| | 3 | 4 | Abiola Ogunbanwo | Nigeria | DNS | |
| | 6 | 9 | Chan Zi Yi | Singapore | DNS | |
| | 8 | 9 | Nina Kost | Switzerland | DNS | |
| | 9 | 3 | Barbora Seemanová | Czech Republic | DNS | |

### Semifinals

The semifinals were started on 17 December at 19:09.
| Rank | Heat | Lane | Name | Nationality | Time | Notes |
| 1 | 1 | 4 | Sarah Sjöström | Sweden | 51.53 | Q |
| 2 | 2 | 4 | Siobhán Haughey | Hong Kong | 51.82 | Q |
| 3 | 2 | 3 | Katarzyna Wasick | Poland | 52.28 | Q |
| 3 | 2 | 5 | Kayla Sanchez | Canada | 52.28 | Q |
| 5 | 1 | 5 | Abbey Weitzeil | United States | 52.29 | Q |
| 5 | 2 | 1 | Marrit Steenbergen | Netherlands | 52.29 | Q |
| 7 | 1 | 6 | Torri Huske | United States | 52.48 | Q |
| 8 | 2 | 6 | Marie Wattel | France | 52.59 | Q |
| 9 | 2 | 2 | Michelle Coleman | Sweden | 52.64 | |
| 10 | 1 | 3 | Freya Anderson | Great Britain | 52.67 | |
| 11 | 1 | 7 | Charlotte Bonnet | France | 53.06 | |
| 12 | 2 | 8 | Rebecca Smith | Canada | 53.22 | |
| 13 | 1 | 8 | Cheng Yujie | China | 53.29 | |
| 14 | 1 | 1 | Julie Kepp Jensen | Denmark | 53.30 | |
| 15 | 1 | 2 | Zhu Menghui | China | 53.36 | |
| 16 | 2 | 7 | Lucy Hope | Great Britain | 53.41 | |

### Final

The final was held on 18 December at 18:07.
| Rank | Lane | Name | Nationality | Time | Notes |
| | 5 | Siobhán Haughey | Hong Kong | 50.98 | CR |
| | 4 | Sarah Sjöström | Sweden | 51.31 | |
| | 2 | Abbey Weitzeil | United States | 51.64 | |
| 4 | 3 | Katarzyna Wasick | Poland | 51.71 | |
| 5 | 6 | Kayla Sanchez | Canada | 51.86 | |
| 6 | 1 | Torri Huske | United States | 51.93 | |
| 7 | 8 | Marie Wattel | France | 52.37 | |
| 8 | 7 | Marrit Steenbergen | Netherlands | 52.40 | |