# Swimming at the 2017 World Aquatics Championships – Women's 50 metre breaststroke

The Women's 50 metre breaststroke competition at the 2017 World Championships was held on 29 and 30 July 2017.

## Records

Prior to the competition, the existing world and championship records were as follows.
| World record | Rūta Meilutytė (LTU) | 29.48 | Barcelona, Spain | 3 August 2013 |
| Competition record | Rūta Meilutytė (LTU) | 29.48 | Barcelona, Spain | 3 August 2013 |
The following new records were set during this competition.
| Date | Event | Name | Nationality | Time | Record |
| 30 July | Final | Lilly King | United States | 29.40 | WR, CR |

## Results
### Heats

The heats were held on 29 July at 10:07.
| Rank | Heat | Lane | Name | Nationality | Time | Notes |
| 1 | 6 | 4 | Lilly King | United States | 29.76 | Q |
| 2 | 5 | 4 | Yuliya Yefimova | Russia | 29.99 | Q |
| 3 | 5 | 3 | Arianna Castiglioni | Italy | 30.33 | Q, NR |
| 4 | 6 | 5 | Katie Meili | United States | 30.37 | Q |
| 5 | 4 | 5 | Jennie Johansson | Sweden | 30.40 | Q |
| 6 | 4 | 4 | Rūta Meilutytė | Lithuania | 30.58 | Q |
| 7 | 5 | 6 | Jessica Hansen | Australia | 30.59 | Q |
| 8 | 5 | 5 | Sarah Vasey | Great Britain | 30.71 | Q |
| 9 | 4 | 2 | Natalia Ivaneeva | Russia | 30.81 | Q |
| 10 | 6 | 6 | Jenna Laukkanen | Finland | 30.82 | Q |
| 11 | 4 | 6 | Hrafnhildur Lúthersdóttir | Iceland | 30.88 | Q |
| 12 | 6 | 7 | Veera Kivirinta | Finland | 30.89 | Q |
| 13 | 4 | 3 | Martina Carraro | Italy | 30.92 | Q |
| 14 | 6 | 3 | Satomi Suzuki | Japan | 30.95 | Q |
| 15 | 5 | 1 | Rachel Nicol | Canada | 31.02 | Q |
| 16 | 4 | 1 | Suo Ran | China | 31.22 | Q |
| 17 | 6 | 8 | Rikke Møller Pedersen | Denmark | 31.29 | |
| 18 | 4 | 7 | Dominika Sztandera | Poland | 31.31 | |
| 19 | 6 | 2 | Mariya Liver | Ukraine | 31.33 | |
| 20 | 5 | 2 | Sophie Hansson | Sweden | 31.44 | |
| 21 | 5 | 7 | Macarena Ceballos | Argentina | 31.65 | NR |
| 22 | 6 | 1 | Petra Chocová | Czech Republic | 31.69 | |
| 23 | 4 | 8 | Amit Ivry | Israel | 31.70 | |
| 24 | 3 | 4 | Susann Bjørnsen | Norway | 31.75 | |
| 25 | 6 | 0 | Kaylene Corbett | South Africa | 31.91 | |
| 26 | 5 | 0 | Maria Romanjuk | Estonia | 31.92 | |
| 27 | 4 | 0 | Anna Sztankovics | Hungary | 31.94 | |
| 28 | 5 | 8 | Andrea Podmaníková | Slovakia | 32.04 | |
| 29 | 4 | 9 | Mercedes Toledo | Venezuela | 32.24 | |
| 30 | 6 | 9 | Dana Kolidzeja | Latvia | 32.59 | |
| 31 | 5 | 9 | Anandia Evato | Indonesia | 32.62 | |
| 32 | 3 | 6 | Tilka Paljk | Zambia | 32.72 | |
| 33 | 3 | 2 | Amy Micallef | Malta | 33.46 | NR |
| 34 | 3 | 5 | Evita Leter | Suriname | 33.77 | |
| 35 | 3 | 3 | Dariya Talanova | Kyrgyzstan | 33.85 | |
| 36 | 3 | 7 | Vanessa Rivas | Dominican Republic | 34.40 | |
| 37 | 3 | 8 | Oreoluwa Cherebin | Grenada | 34.88 | |
| 38 | 3 | 1 | Meri Mumladze | Georgia | 34.91 | |
| 39 | 1 | 4 | Jang Myong-gyong | North Korea | 35.11 | |
| 40 | 2 | 1 | Naomy Grand'Pierre | Haiti | 35.85 | |
| 41 | 2 | 3 | Mahfuza Khatun | Bangladesh | 36.53 | |
| 42 | 2 | 4 | Colleen Furgeson | Marshall Islands | 36.97 | |
| 43 | 3 | 0 | Melisa Zhdrella | Kosovo | 37.06 | |
| 44 | 2 | 7 | Angelika Ouedraogo | Burkina Faso | 37.89 | |
| 45 | 1 | 7 | Karina Klimyk | Tajikistan | 38.47 | |
| 46 | 2 | 2 | Elen Yesayan | Armenia | 38.67 | |
| 47 | 1 | 6 | Sajina Aishath | Maldives | 39.74 | |
| 48 | 2 | 0 | Siri Arun Budcharern | Laos | 40.57 | |
| 49 | 2 | 6 | Laila Zangwio | Ghana | 42.03 | |
| 50 | 1 | 1 | Roukaya Mahamane | Niger | 46.49 | |
| 51 | 3 | 9 | Bunturabie Jalloh | Sierra Leone | 49.38 | |
| 52 | 2 | 5 | Fatoumata Conde | Guinea | 53.04 | |
| | 1 | 5 | Fatoumata Konate | Mali | DNS | DNS |
| | 1 | 2 | Fatou Diagne | Senegal | DNS | DNS |
| | 2 | 8 | Kokoe Ahyee | Ivory Coast | DNS | DNS |
| | 2 | 9 | Albertine Rwabukamba | Rwanda | DSQ | DSQ |

### Semifinals

The semifinals were held on 29 July at 17:56.

#### Semifinal 1

| Rank | Lane | Name | Nationality | Time | Notes |
| 1 | 4 | Yuliya Yefimova | Russia | 29.73 | Q |
| 2 | 5 | Katie Meili | United States | 30.12 | Q |
| 3 | 3 | Rūta Meilutytė | Lithuania | 30.40 | Q |
| 4 | 6 | Sarah Vasey | Great Britain | 30.46 | Q |
| 5 | 2 | Jenna Laukkanen | Finland | 30.92 | |
| 6 | 1 | Satomi Suzuki | Japan | 30.95 | |
| 7 | 7 | Veera Kivirinta | Finland | 30.98 | |
| 8 | 8 | Suo Ran | China | 31.14 | |

#### Semifinal 2

| Rank | Lane | Name | Nationality | Time | Notes |
| 1 | 4 | Lilly King | United States | 29.60 | Q, AM |
| 2 | 3 | Jennie Johansson | Sweden | 30.41 | Q |
| 3 | 5 | Arianna Castiglioni | Italy | 30.46 | Q |
| 4 | 8 | Rachel Nicol | Canada | 30.49 | Q |
| 5 | 6 | Jessica Hansen | Australia | 30.67 | |
| 6 | 7 | Hrafnhildur Lúthersdóttir | Iceland | 30.71 | NR |
| 7 | 2 | Natalia Ivaneeva | Russia | 30.82 | |
| 8 | 1 | Martina Carraro | Italy | 31.16 | |

### Final

The final was held on 30 July at 17:32.
| Rank | Lane | Name | Nationality | Time | Notes |
| | 4 | Lilly King | United States | 29.40 | WR |
| | 5 | Yuliya Yefimova | Russia | 29.57 | |
| | 3 | Katie Meili | United States | 29.99 | |
| 4 | 6 | Rūta Meilutytė | Lithuania | 30.20 | |
| 5 | 2 | Jennie Johansson | Sweden | 30.31 | |
| 6 | 7 | Sarah Vasey | Great Britain | 30.62 | |
| 7 | 1 | Arianna Castiglioni | Italy | 30.74 | |
| 8 | 8 | Rachel Nicol | Canada | 30.80 | |