# Swimming at the 2011 World Aquatics Championships – Women's 50 metre breaststroke

The women's 50 metre breaststroke competition of the swimming events at the 2011 World Aquatics Championships was held on July 30 with the heats and the semifinals and July 31 with the final.

## Records

Prior to the competition, the existing world and championship records were as follows.
| | Name | Nation | Time | Location | Date |
| World record | Jessica Hardy | United States | 29.80 | Federal Way | August 7, 2009 |
| Championship record | Yuliya Yefimova | Russia | 30.09 | Rome | August 2, 2009 |

## Results
### Heats

36 swimmers participated in 5 heats.
| Rank | Heat | Lane | Name | Nationality | Time | Notes |
| 1 | 5 | 4 | Jessica Hardy | United States | 30.20 | Q |
| 2 | 3 | 4 | Yuliya Yefimova | Russia | 30.72 | Q |
| 2 | 4 | 5 | Rebecca Soni | United States | 30.72 | Q |
| 4 | 5 | 3 | Jennie Johansson | Sweden | 30.89 | Q, NR |
| 5 | 5 | 5 | Leisel Jones | Australia | 30.93 | Q |
| 6 | 4 | 4 | Leiston Pickett | Australia | 31.07 | Q |
| 7 | 4 | 3 | Rebecca Ejdervik | Sweden | 31.19 | Q |
| 8 | 3 | 3 | Kate Haywood | Great Britain | 31.30 | Q |
| 9 | 3 | 6 | Liu Xiaoyu | China | 31.32 | Q |
| 10 | 4 | 6 | Moniek Nijhuis | Netherlands | 31.40 | Q |
| 10 | 5 | 6 | Zhao Jin | China | 31.40 | Q |
| 12 | 5 | 7 | Petra Chocova | Czech Republic | 31.41 | Q |
| 13 | 5 | 8 | Sycerika McMahon | Ireland | 31.49 | Q, NR |
| 14 | 4 | 7 | Rikke Pedersen | Denmark | 31.65 | Q |
| 15 | 3 | 8 | Suzaan van Biljon | South Africa | 31.96 | Q |
| 16 | 3 | 1 | Jane Trepp | Estonia | 32.00 | Q |
| 17 | 5 | 1 | Erla Haraldsdottir | Iceland | 32.10 | |
| 18 | 3 | 7 | Stephanie Spahn | Switzerland | 32.14 | |
| 19 | 2 | 5 | Danielle Beaubrun | Saint Lucia | 32.27 | NR |
| 20 | 4 | 8 | Loh Christina | Malaysia | 32.29 | |
| 21 | 3 | 2 | Kim Dal-Eun | South Korea | 32.43 | |
| 22 | 4 | 1 | Anastasia Christoforou | Cyprus | 32.69 | |
| 23 | 2 | 6 | Ivana Ninkovic | Bosnia and Herzegovina | 32.86 | |
| 24 | 2 | 3 | Lei On Kei | Macau | 32.90 | |
| 25 | 2 | 4 | Patricia Casellas | Puerto Rico | 33.62 | |
| 26 | 2 | 2 | Jamila Lunkuse | Uganda | 36.65 | |
| 27 | 2 | 1 | Mariana Henriques | Angola | 37.23 | |
| 28 | 2 | 7 | Oksana Hatamkhanova | Azerbaijan | 37.94 | |
| 29 | 1 | 4 | Antoinette Guedia Mouafo | Cameroon | 40.15 | |
| 30 | 1 | 5 | Angelika Sita Ouedraogo | Burkina Faso | 40.93 | |
| 31 | 2 | 8 | Dede Camara | Guinea | 44.44 | |
| 32 | 1 | 6 | Vilayphone Vongphachanh | Laos | 46.37 | |
| 33 | 1 | 2 | Angele Gbenou | Benin | 46.90 | |
| 34 | 1 | 7 | Nafissa Adamou | Niger | 51.24 | |
| – | 3 | 5 | Dorothea Brandt | Germany | | DNS |
| – | 4 | 2 | Jillian Tyler | Canada | | DNS |
| – | 5 | 2 | Satomi Suzuki | Japan | | DNS |
| – | 1 | 3 | Ingrid Outtara | Burkina Faso | | DSQ |

### Semifinals

The semifinals were held at 18:16.

#### Semifinal 1

| Rank | Lane | Name | Nationality | Time | Notes |
| 1 | 4 | Yuliya Yefimova | Russia | 30.81 | Q |
| 2 | 3 | Leiston Pickett | Australia | 30.96 | Q |
| 3 | 5 | Jennie Johansson | Sweden | 31.16 | Q |
| 4 | 2 | Moniek Nijhuis | Netherlands | 31.40 | Q |
| 5 | 6 | Kate Haywood | Great Britain | 31.43 | |
| 6 | 7 | Petra Chocova | Czech Republic | 31.75 | |
| 7 | 1 | Rikke Pedersen | Denmark | 32.07 | |
| 8 | 8 | Jane Trepp | Estonia | 32.33 | |

#### Semifinal 2

| Rank | Lane | Name | Nationality | Time | Notes |
| 1 | 4 | Jessica Hardy | United States | 30.40 | Q |
| 2 | 5 | Rebecca Soni | United States | 30.74 | Q |
| 3 | 3 | Leisel Jones | Australia | 31.14 | Q |
| 4 | 6 | Rebecca Ejdervik | Sweden | 31.41 | Q |
| 5 | 7 | Zhao Jin | China | 31.46 | |
| 6 | 2 | Liu Xiaoyu | China | 31.50 | |
| 7 | 1 | Sycerika McMahon | Ireland | 31.83 | |
| 8 | 8 | Suzaan van Biljon | South Africa | 31.97 | |

### Final

The final was held at 18:02.
| Rank | Lane | Name | Nationality | Time | Notes |
| | 4 | Jessica Hardy | United States | 30.19 | |
| | 3 | Yuliya Yefimova | Russia | 30.49 | |
| | 5 | Rebecca Soni | United States | 30.58 | |
| 4 | 6 | Leiston Pickett | Australia | 30.74 | |
| 5 | 7 | Jennie Johansson | Sweden | 30.89 | =NR |
| 6 | 2 | Leisel Jones | Australia | 31.01 | |
| 7 | 1 | Moniek Nijhuis | Netherlands | 31.33 | |
| 8 | 8 | Rebecca Ejdervik | Sweden | 31.45 | |