# Swimming at the 2017 World Aquatics Championships – Women's 100 metre backstroke

The Women's 100 metre backstroke competition at the 2017 World Championships was held on 24 and 25 July 2017.

## Records

Prior to the competition, the existing world and championship records were as follows.
| World record | Gemma Spofforth (GBR) | 58.12 | Rome, Italy | 28 July 2009 |
| Competition record | Gemma Spofforth (GBR) | 58.12 | Rome, Italy | 28 July 2009 |
The following new records were set during this competition.
| Date | Event | Name | Nationality | Time | Record |
| 25 July | Final | Kylie Masse | Canada | 58.10 | WR, CR |

## Results
### Heats

The heats were held on 24 July at 09:30.
| Rank | Heat | Lane | Name | Nationality | Time | Notes |
| 1 | 6 | 4 | Kylie Masse | Canada | 58.62 | Q |
| 2 | 5 | 4 | Katinka Hosszú | Hungary | 58.80 | Q, WD |
| 3 | 6 | 5 | Emily Seebohm | Australia | 58.95 | Q |
| 4 | 4 | 3 | Anastasia Fesikova | Russia | 59.58 | Q |
| 5 | 4 | 5 | Olivia Smoliga | United States | 59.70 | Q |
| 6 | 4 | 4 | Kathleen Baker | United States | 59.76 | Q |
| 7 | 6 | 6 | Holly Barratt | Australia | 59.87 | Q |
| 8 | 5 | 3 | Chen Jie | China | 59.88 | Q |
| 8 | 5 | 6 | Kathleen Dawson | Great Britain | 59.88 | Q |
| 10 | 4 | 6 | Daria Ustinova | Russia | 59.90 | Q |
| 11 | 6 | 3 | Georgia Davies | Great Britain | 1:00.24 | Q |
| 12 | 5 | 7 | Simona Baumrtová | Czech Republic | 1:00.28 | Q |
| 13 | 4 | 2 | Hilary Caldwell | Canada | 1:00.37 | Q |
| 14 | 4 | 7 | Kira Toussaint | Netherlands | 1:00.52 | Q |
| 14 | 5 | 5 | Fu Yuanhui | China | 1:00.52 | Q |
| 16 | 6 | 2 | Daryna Zevina | Ukraine | 1:00.59 | Q |
| 17 | 5 | 8 | Mathilde Cini | France | 1:00.70 | Q |
| 18 | 6 | 9 | Theodora Drakou | Greece | 1:00.88 | |
| 19 | 3 | 6 | África Zamorano | Spain | 1:00.89 | |
| 20 | 4 | 0 | Margherita Panziera | Italy | 1:01.03 | |
| 21 | 5 | 0 | Im Da-sol | South Korea | 1:01.07 | |
| 22 | 4 | 8 | Alicja Tchórz | Poland | 1:01.26 | |
| 23 | 5 | 1 | Mimosa Jallow | Finland | 1:01.33 | |
| 24 | 3 | 5 | Ida Lindborg | Sweden | 1:01.40 | |
| 25 | 4 | 1 | Andrea Berrino | Argentina | 1:01.63 | |
| 26 | 6 | 0 | Gabrielle Fa'amausili | New Zealand | 1:01.80 | |
| 27 | 3 | 0 | Ugnė Mažutaitytė | Lithuania | 1:02.02 | NR |
| 28 | 3 | 4 | Fernanda González | Mexico | 1:02.03 | |
| 29 | 4 | 9 | Caroline Pilhatsch | Austria | 1:02.10 | |
| 29 | 6 | 7 | Katarína Listopadová | Slovakia | 1:02.10 | |
| 31 | 5 | 9 | Claudia Lau | Hong Kong | 1:02.23 | |
| 32 | 3 | 1 | Isabella Arcila | Colombia | 1:02.24 | |
| 32 | 5 | 2 | Béryl Gastaldello | France | 1:02.24 | |
| 34 | 6 | 8 | Ekaterina Avramova | Turkey | 1:02.42 | |
| 35 | 6 | 1 | Yekaterina Rudenko | Kazakhstan | 1:02.51 | |
| 36 | 2 | 2 | Naomi Ruele | Botswana | 1:02.96 | |
| 37 | 3 | 3 | Tatiana Salcutan | Moldova | 1:03.08 | |
| 38 | 3 | 7 | Gabriela Georgieva | Bulgaria | 1:03.56 | |
| 39 | 3 | 2 | Kristina Steina | Latvia | 1:04.03 | |
| 40 | 3 | 8 | Kimiko Raheem | Sri Lanka | 1:04.06 | |
| 41 | 2 | 5 | Signhild Joensen | Faroe Islands | 1:04.50 | |
| 42 | 2 | 3 | Lushavel Stickland | Samoa | 1:04.96 | |
| 43 | 2 | 6 | Robyn Lee | Zimbabwe | 1:05.05 | |
| 44 | 2 | 8 | Carolina Cermelli | Panama | 1:05.50 | |
| 45 | 3 | 9 | Karen Vilorio | Honduras | 1:05.88 | |
| 46 | 2 | 7 | Hiba Fahsi | Morocco | 1:06.08 | |
| 47 | 2 | 0 | Cheyenne Rova | Fiji | 1:07.10 | |
| 48 | 1 | 4 | Elodie Razafy | Madagascar | 1:07.49 | |
| 49 | 2 | 4 | Alexus Laird | Seychelles | 1:07.67 | |
| 50 | 2 | 1 | Lauren Hew | Cayman Islands | 1:08.38 | |
| 51 | 1 | 6 | Lea Ricart Martínez | Andorra | 1:08.60 | |
| 52 | 1 | 2 | Jennifer Rizkallah | Lebanon | 1:10.36 | |
| 53 | 1 | 8 | Britheny Joassaint | Haiti | 1:12.12 | |
| 54 | 1 | 3 | Nooran Ba Matraf | Yemen | 1:12.38 | |
| 55 | 1 | 5 | Victoria Chentsova | Northern Mariana Islands | 1:14.32 | |
| 56 | 1 | 7 | Yesuin Bayar | Mongolia | 1:14.77 | |
| 57 | 1 | 0 | Robyn Young | Eswatini | 1:16.34 | |
| 58 | 2 | 9 | Amanda Poppe | Guam | 1:18.24 | |
| 59 | 1 | 1 | Ammara Pinto | Malawi | 1:20.95 | |

### Semifinals

The semifinals were held on 24 July at 18.24.

#### Semifinal 1

| Rank | Lane | Name | Nationality | Time | Notes |
| 1 | 4 | Emily Seebohm | Australia | 58.85 | Q |
| 2 | 5 | Olivia Smoliga | United States | 59.07 | Q |
| 3 | 6 | Kathleen Dawson | Great Britain | 59.82 | Q |
| 4 | 2 | Georgia Davies | Great Britain | 59.94 | |
| 5 | 3 | Holly Barratt | Australia | 59.95 | |
| 6 | 7 | Hilary Caldwell | Canada | 1:00.29 | |
| 7 | 1 | Fu Yuanhui | China | 1:00.39 | |
| 8 | 8 | Mathilde Cini | France | 1:00.44 | |

#### Semifinal 2

| Rank | Lane | Name | Nationality | Time | Notes |
| 1 | 4 | Kylie Masse | Canada | 58.18 | Q, AM |
| 2 | 3 | Kathleen Baker | United States | 59.03 | Q |
| 3 | 5 | Anastasia Fesikova | Russia | 59.26 | Q |
| 4 | 7 | Simona Baumrtová | Czech Republic | 59.65 | Q, NR |
| 5 | 2 | Daria Ustinova | Russia | 59.74 | Q |
| 6 | 6 | Chen Jie | China | 59.85 | |
| 7 | 8 | Daryna Zevina | Ukraine | 1:00.40 | |
| 8 | 1 | Kira Toussaint | Netherlands | 1:00.76 | |

### Final

The final was held on 25 July at 18:21.
| Rank | Lane | Name | Nationality | Time | Notes |
| | 4 | Kylie Masse | Canada | 58.10 | WR |
| | 3 | Kathleen Baker | United States | 58.58 | |
| | 5 | Emily Seebohm | Australia | 58.59 | |
| 4 | 6 | Olivia Smoliga | United States | 58.77 | |
| 5 | 2 | Anastasia Fesikova | Russia | 58.83 | |
| 6 | 1 | Daria Ustinova | Russia | 59.50 | |
| 7 | 7 | Simona Baumrtová | Czech Republic | 59.71 | |
| 8 | 8 | Kathleen Dawson | Great Britain | 59.90 | |