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

The Women's 100 metre individual medley competition of the 2021 FINA World Swimming Championships (25 m) will be held on 18 and 19 December 2021.

## Records

Prior to the competition, the existing world and championship records were as follows.

| World record | Katinka Hosszú (HUN) | 56.51 | Berlin, Germany | 7 August 2017 |
| - | - | - | - | - |
| Competition record | Katinka Hosszú (HUN) | 56.70 | Doha, Qatar | 5 December 2014 |

## Results

### Heats

The heats were started on 18 December at 10:12.

| Rank | Heat | Lane | Name | Nationality | Time | Notes |
| - | - | - | - | - | - | - |
| 1 | 3 | 4 | Anastasia Gorbenko | Israel | 58.36 | Q |
| 2 | 3 | 3 | Maria Ugolkova | Switzerland | 59.05 | Q |
| 3 | 4 | 5 | Marrit Steenbergen | Netherlands | 59.06 | Q |
| 4 | 3 | 5 | Kayla Sanchez | Canada | 59.17 | Q |
| 5 | 2 | 5 | Diana Petkova | Bulgaria | 59.19 | Q, NR |
| 6 | 4 | 4 | Maria Kameneva | Russian Swimming Federation | 59.34 | Q |
| 7 | 5 | 4 | Béryl Gastaldello | France | 59.38 | Q |
| 8 | 4 | 3 | Abbey Weitzeil | United States | 59.44 | Q |
| 9 | 3 | 2 | Lena Kreundl | Austria | 59.45 | Q |
| 9 | 5 | 2 | Bailey Andison | Canada | 59.45 | Q |
| 9 | 5 | 3 | Costanza Cocconcelli | Italy | 59.45 | Q |
| 12 | 5 | 7 | Emelie Fast | Sweden | 59.50 | Q |
| 13 | 5 | 5 | Melanie Margalis | United States | 59.54 | Q |
| 14 | 2 | 2 | Tang Qianting | China | 59.56 | Q |
| 15 | 2 | 6 | Mona McSharry | Ireland | 59.65 | Q, NR |
| 15 | 4 | 2 | Kim Busch | Netherlands | 59.65 | Q |
| 17 | 3 | 6 | Irina Shvaeva | Russian Swimming Federation | 1:00.22 | |
| 18 | 4 | 1 | Kristýna Horská | Czech Republic | 1:00.31 | |
| 19 | 3 | 1 | Ilaria Cusinato | Italy | 1:00.37 | |
| 20 | 5 | 9 | Laura Littlejohn | New Zealand | 1:00.43 | |
| 21 | 4 | 7 | Fanny Lecluyse | Belgium | 1:00.52 | |
| 22 | 5 | 1 | Molly Renshaw | Great Britain | 1:00.67 | |
| 23 | 4 | 9 | Nathalia Almeida | Brazil | 1:01.02 | |
| 24 | 3 | 7 | Cornelia Pammer | Austria | 1:01.33 | |
| 25 | 5 | 0 | Janja Šegel | Slovenia | 1:01.59 | |
| 26 | 4 | 8 | Tamara Potocká | Slovakia | 1:01.65 | |
| 27 | 3 | 9 | Ieva Maļuka | Latvia | 1:01.69 | |
| 28 | 3 | 8 | Sze Hang Yu | Hong Kong | 1:01.76 | |
| 29 | 4 | 0 | Natalie Kan | Hong Kong | 1:01.77 | |
| 30 | 2 | 4 | Maria Romanjuk | Estonia | 1:01.79 | |
| 31 | 3 | 0 | Nina Stanisavljević | Serbia | 1:01.97 | |
| 32 | 2 | 3 | Jessica Vall | Spain | 1:02.04 | |
| 33 | 2 | 8 | Maria Drasidou | Greece | 1:02.17 | |
| 34 | 2 | 1 | Jung Ha-eun | South Korea | 1:02.24 | |
| 35 | 2 | 7 | Marie Pietruschka | Germany | 1:02.62 | |
| 36 | 2 | 9 | Florencia Perotti | Argentina | 1:03.16 | |
| 37 | 3 | 0 | Phiangkhwan Pawapotako | Thailand | 1:03.23 | |
| 38 | 1 | 4 | Marissa Lugo | Puerto Rico | 1:04.11 | |
| 39 | 1 | 2 | Luna Chabat | Uruguay | 1:04.28 | |
| 40 | 1 | 1 | Isabella Alas | El Salvador | 1:06.10 | |
| 41 | 1 | 3 | Alison Jackson | Cayman Islands | 1:07.32 | |
| 42 | 1 | 6 | Aaliyah Palestrini | Seychelles | 1:10.20 | |
| 43 | 1 | 5 | Latroya Pina | Cape Verde | 1:12.08 | |
| 44 | 1 | 7 | Hamna Ahmed | Maldives | 1:15.82 | |
| | 4 | 6 | Fanny Teijonsalo | Finland | DNS | |
| | 5 | 6 | Michelle Coleman | Sweden | DNS | |
| | 5 | 8 | Quah Jing Wen | Singapore | DNS | |

### Semifinals

The semifinals were started on 18 December at 19:08.

| Rank | Heat | Lane | Name | Nationality | Time | Notes |
| - | - | - | - | - | - | - |
| 1 | 1 | 4 | Maria Ugolkova | Switzerland | 58.25 | Q, NR |
| 2 | 1 | 3 | Maria Kameneva | Russian Swimming Federation | 58.45 | Q |
| 3 | 2 | 7 | Costanza Cocconcelli | Italy | 58.58 | Q |
| 4 | 2 | 4 | Anastasia Gorbenko | Israel | 58.65 | Q |
| 5 | 2 | 6 | Béryl Gastaldello | France | 58.66 | Q |
| 6 | 1 | 2 | Bailey Andison | Canada | 58.74 | Q |
| 7 | 2 | 5 | Marrit Steenbergen | Netherlands | 58.75 | Q |
| 8 | 2 | 1 | Melanie Margalis | United States | 58.96 | Q |
| 9 | 1 | 6 | Abbey Weitzeil | United States | 59.00 | |
| 10 | 1 | 1 | Tang Qianting | China | 59.01 | |
| 11 | 1 | 5 | Kayla Sanchez | Canada | 59.07 | |
| 12 | 2 | 2 | Lena Kreundl | Austria | 59.08 | NR |
| 13 | 2 | 8 | Mona McSharry | Ireland | 59.35 | NR |
| 14 | 1 | 7 | Emelie Fast | Sweden | 59.56 | |
| 15 | 2 | 3 | Diana Petkova | Bulgaria | 59.58 | |
| 16 | 1 | 8 | Kim Busch | Netherlands | 59.82 | |

### Final

| Rank | Lane | Name | Nationality | Time | Notes |
| - | - | - | - | - | - |
| | 6 | Anastasia Gorbenko | Israel | 57.80 | NR |
| | 2 | Béryl Gastaldello | France | 57.96 | |
| | 5 | Maria Kameneva | Russian Swimming Federation | 58.15 | |
| 4 | 4 | Maria Ugolkova | Switzerland | 58.27 | |
| 5 | 3 | Costanza Cocconcelli | Italy | 58.66 | |
| 6 | 1 | Marrit Steenbergen | Netherlands | 58.74 | |
| 7 | 8 | Melanie Margalis | United States | 59.10 | |
| 8 | 7 | Bailey Andison | Canada | 59.37 | |
