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

The Women's 100 metre backstroke competition of the 2021 FINA World Swimming Championships (25 m) was held on 16 and 17 December 2021.

## Records

Prior to the competition, the existing world and championship records were as follows.
| World record | Minna Atherton (AUS) | 54.89 | Budapest, Hungary | 26 November 2021 |
| Competition record | Katinka Hosszú (HUN) | 55.03 | Doha, Qatar | 4 December 2014 |

## Results
### Heats

The heats were started on 16 December at 11:51.
| Rank | Heat | Lane | Name | Nationality | Time | Notes |
| 1 | 4 | 7 | Katharine Berkoff | United States | 55.92 | Q |
| 2 | 5 | 4 | Kira Toussaint | Netherlands | 55.95 | Q |
| 3 | 4 | 4 | Kylie Masse | Canada | 56.12 | Q |
| 4 | 5 | 5 | Louise Hansson | Sweden | 56.41 | Q |
| 5 | 5 | 7 | Rhyan White | United States | 56.76 | Q |
| 6 | 4 | 3 | Simona Kubová | Czech Republic | 57.06 | Q |
| 7 | 3 | 3 | Anastasiya Shkurdai | Belarus | 57.07 | Q |
| 8 | 3 | 4 | Maaike de Waard | Netherlands | 57.09 | Q |
| 9 | 3 | 1 | Wan Letian | China | 57.36 | Q |
| 10 | 4 | 5 | Maggie Mac Neil | Canada | 57.42 | Q |
| 11 | 5 | 0 | Holly Barratt | Australia | 57.72 | Q |
| 12 | 3 | 7 | Peng Xuwei | China | 57.82 | Q |
| 13 | 4 | 6 | Silvia Scalia | Italy | 58.05 | Q |
| 14 | 3 | 6 | Hanna Rosvall | Sweden | 58.33 | Q |
| 15 | 4 | 1 | Anastasia Gorbenko | Israel | 58.39 | Q |
| 16 | 1 | 7 | Caroline Pilhatsch | Austria | 58.43 | Q, NR |
| 17 | 5 | 3 | Margherita Panziera | Italy | 58.46 | |
| 18 | 4 | 2 | Ekaterina Avramova | Turkey | 58.54 | |
| 19 | 3 | 5 | Analia Pigrée | France | 58.63 | |
| 20 | 5 | 2 | Daria Ustinova | Russian Swimming Federation | 59.15 | |
| 21 | 5 | 6 | Daryna Zevina | Ukraine | 59.36 | |
| 22 | 3 | 8 | Stephanie Au | Hong Kong | 59.58 | |
| 23 | 5 | 8 | Laura Riedemann | Germany | 59.64 | |
| 24 | 4 | 0 | Nina Kost | Switzerland | 59.76 | |
| 25 | 3 | 2 | Danielle Hill | Ireland | 59.87 | |
| 26 | 4 | 8 | Gabriela Georgieva | Bulgaria | 59.94 | |
| 27 | 5 | 9 | Eszter Szabó-Feltóthy | Hungary | 1:00.27 | |
| 28 | 5 | 1 | Janja Šegel | Slovenia | 1:00.30 | |
| 29 | 3 | 9 | Chloe Isleta | Philippines | 1:00.42 | NR |
| 30 | 2 | 4 | Andrea Becali | Cuba | 1:01.25 | NR |
| 31 | 2 | 5 | Sarah Szklaruk | Chile | 1:01.36 | NR |
| 32 | 2 | 6 | Mia Blaževska Eminova | North Macedonia | 1:01.63 | |
| 33 | 3 | 0 | Elisabeth Erlendsdóttir | Faroe Islands | 1:02.40 | |
| 34 | 2 | 3 | Ridhima Veerendrakumar | India | 1:03.29 | |
| 35 | 2 | 8 | Catarina Sousa | Angola | 1:04.12 | NR |
| 36 | 1 | 8 | Leiya Istanbouli | Lebanon | 1:05.69 | |
| 37 | 2 | 1 | Ganga Senavirathne | Sri Lanka | 1:06.06 | |
| 38 | 1 | 1 | Arianis Martínez | Panama | 1:06.72 | |
| 39 | 2 | 0 | Salome Nikolaishvili | Georgia | 1:06.97 | |
| 40 | 1 | 3 | Leilaa Al-Khatib | United Arab Emirates | 1:07.79 | |
| 41 | 1 | 2 | Erina Idrizaj | Kosovo | 1:08.47 | |
| 42 | 1 | 4 | Bisma Khan | Pakistan | 1:08.55 | |
| 43 | 2 | 7 | Noor Yussuf Abdulla | Bahrain | 1:08.72 | |
| 44 | 2 | 9 | Lindsay Barr | United States Virgin Islands | 1:10.07 | |
| 45 | 1 | 9 | Kevern da Silva | Saint Vincent and the Grenadines | 1:10.71 | |
| 46 | 1 | 5 | Jennifer Harding-Marlin | Saint Kitts and Nevis | 1:11.63 | |
| 47 | 1 | 0 | Patrice Mahaica | Guyana | 1:12.24 | |
| 48 | 1 | 6 | Aishath Sausan | Maldives | 1:14.03 | NR |
| | 2 | 2 | Elizabeth Jiménez | Dominican Republic | DSQ | |
| | 4 | 9 | McKenna DeBever | Peru | DNS | |

### Semifinals

The semifinals were started on 16 December at 19:16.
| Rank | Heat | Lane | Name | Nationality | Time | Notes |
| 1 | 1 | 5 | Louise Hansson | Sweden | 55.85 | Q, NR |
| 2 | 1 | 4 | Kira Toussaint | Netherlands | 56.05 | Q |
| 2 | 2 | 3 | Rhyan White | United States | 56.05 | Q |
| 4 | 2 | 5 | Kylie Masse | Canada | 56.07 | Q |
| 5 | 2 | 4 | Katharine Berkoff | United States | 56.10 | Q |
| 6 | 2 | 6 | Anastasiya Shkurdai | Belarus | 56.65 | Q, NR |
| 7 | 1 | 6 | Maaike de Waard | Netherlands | 56.72 | Q |
| 8 | 1 | 3 | Simona Kubová | Czech Republic | 57.26 | Q |
| 9 | 2 | 7 | Peng Xuwei | China | 57.36 | |
| 10 | 1 | 1 | Anastasia Gorbenko | Israel | 57.45 | NR |
| 10 | 2 | 2 | Wan Letian | China | 57.45 | |
| 12 | 1 | 2 | Holly Barratt | Australia | 57.59 | |
| 13 | 1 | 7 | Silvia Scalia | Italy | 57.62 | |
| 14 | 2 | 1 | Hanna Rosvall | Sweden | 57.91 | |
| 15 | 1 | 8 | Maggie Mac Neil | Canada | 58.13 | |
| 16 | 2 | 8 | Caroline Pilhatsch | Austria | 59.46 | |

### Final

The final was held on 17 December at 19:35.
| Rank | Lane | Name | Nationality | Time | Notes |
| | 4 | Louise Hansson | Sweden | 55.20 | NR |
| | 6 | Kylie Masse | Canada | 55.22 | NR |
| | 2 | Katharine Berkoff | United States | 55.40 | |
| 4 | 5 | Kira Toussaint | Netherlands | 55.53 | |
| 5 | 3 | Rhyan White | United States | 55.87 | |
| 6 | 1 | Maaike de Waard | Netherlands | 56.11 | |
| 7 | 8 | Simona Kubová | Czech Republic | 56.68 | |
| 8 | 7 | Anastasiya Shkurdai | Belarus | 56.99 | |