# Swimming at the 2018 Summer Youth Olympics – Girls' 50 metre backstroke

The girls' 50 metre backstroke event at the 2018 Summer Youth Olympics took place on 10 and 11 October at the Natatorium in Buenos Aires, Argentina.

## Results
### Heats

The heats were started on 10 October at 10:14.
| Rank | Heat | Lane | Name | Nationality | Time | Notes |
| 1 | 4 | 4 | Kaylee McKeown | Australia | 28.17 | Q |
| 2 | 4 | 2 | Rhyan White | United States | 28.46 | Q |
| 2 | 5 | 4 | Daria Vaskina | Russia | 28.46 | Q |
| 4 | 5 | 3 | Tamara Frías | Spain | 28.89 | Q |
| 5 | 4 | 3 | Madison Broad | Canada | 28.95 | Q |
| 6 | 4 | 5 | Lila Touili | France | 29.07 | Q |
| 7 | 3 | 2 | Arina Baikova | Latvia | 29.25 | Q |
| 8 | 3 | 4 | Peng Xuwei | China | 29.32 | Q |
| 9 | 3 | 5 | Fernanda de Goeij | Brazil | 29.33 | Q |
| 10 | 5 | 5 | Anastasiya Shkurdai | Belarus | 29.35 | Q, WD |
| 11 | 2 | 5 | Natalie Kan | Hong Kong | 29.39 | Q |
| 11 | 3 | 3 | Laura Ilyés | Hungary | 29.39 | Q |
| 13 | 4 | 6 | Alena Semizhon | Belarus | 29.43 | Q |
| 14 | 4 | 1 | Taydé Sansores | Mexico | 29.51 | Q |
| 15 | 4 | 7 | Diana Nazarova | Kazakhstan | 29.72 | Q |
| 16 | 3 | 6 | Ingeborg Løyning | Norway | 29.73 | Q |
| 17 | 5 | 2 | Malene Rypestøl | Norway | 29.77 | Q |
| 18 | 2 | 6 | Maria Pessanha | Brazil | 29.83 | |
| 19 | 3 | 1 | Kalia Antoniou | Cyprus | 29.91 | |
| 20 | 5 | 7 | Chen Szu-chi | Chinese Taipei | 30.02 | |
| 21 | 2 | 2 | Kristýna Štemberová | Czech Republic | 30.04 | |
| 22 | 2 | 4 | Margaret Markvardt | Estonia | 30.14 | |
| 23 | 5 | 6 | Mariella Venter | South Africa | 30.15 | |
| 24 | 3 | 7 | Tatiana Salcuțan | Moldova | 30.21 | |
| 25 | 5 | 1 | Nea-Amanda Heinola | Finland | 30.27 | |
| 26 | 3 | 8 | Gina Galloway | New Zealand | 30.31 | |
| 27 | 4 | 8 | Lucija Šulenta | Croatia | 30.50 | |
| 28 | 2 | 3 | Madelyn Moore | Bermuda | 30.59 | |
| 29 | 2 | 7 | Sara Junevik | Sweden | 30.64 | |
| 30 | 2 | 1 | Mia Ann Phiri | Zambia | 30.89 | |
| 31 | 5 | 8 | Karolina Jurczyk | Poland | 31.00 | |
| 32 | 1 | 7 | Carolina Cermelli | Panama | 31.18 | |
| 33 | 2 | 8 | Aaliyah Palestrini | Seychelles | 32.11 | |
| 34 | 1 | 1 | Robyn Young | Eswatini | 32.34 | |
| 35 | 1 | 4 | Ashley Chai | Brunei | 33.19 | |
| 36 | 1 | 5 | Roylin Akiwo | Palau | 34.84 | |
| 37 | 1 | 3 | Tayamika Chang'anamuno | Malawi | 37.61 | |
| 38 | 1 | 2 | Nafissath Radji | Benin | 37.89 | |
| 39 | 1 | 6 | Kayla Hepler | Marshall Islands | 37.98 | |

### Semifinals

The semifinals were started on 10 October at 18:05.
| Rank | Heat | Lane | Name | Nationality | Time | Notes |
| 1 | 2 | 4 | Kaylee McKeown | Australia | 28.14 | Q |
| 2 | 2 | 5 | Daria Vaskina | Russia | 28.24 | Q |
| 3 | 1 | 4 | Rhyan White | United States | 28.62 | Q |
| 4 | 2 | 3 | Madison Broad | Canada | 28.78 | Q |
| 5 | 1 | 3 | Lila Touili | France | 28.80 | Q |
| 6 | 1 | 1 | Diana Nazarova | Kazakhstan | 28.86 | Q |
| 7 | 2 | 2 | Fernanda de Goeij | Brazil | 28.91 | Q |
| 8 | 1 | 5 | Tamara Frías | Spain | 28.93 | Q |
| 9 | 1 | 2 | Natalie Kan | Hong Kong | 29.09 | |
| 10 | 1 | 7 | Alena Semizhon | Belarus | 29.23 | |
| 11 | 2 | 1 | Taydé Sansores | Mexico | 29.29 | |
| 12 | 1 | 6 | Peng Xuwei | China | 29.49 | |
| 13 | 2 | 8 | Ingeborg Løyning | Norway | 29.76 | |
| 14 | 1 | 8 | Malene Rypestøl | Norway | 29.81 | |
| 15 | 2 | 6 | Arina Baikova | Latvia | 29.86 | |
| 16 | 2 | 7 | Laura Ilyés | Hungary | 30.05 | |

### Final

The final was held on 11 October at 18:53.
| Rank | Lane | Name | Nationality | Time |
| | 4 | Kaylee McKeown | Australia | 28.28 |
| | 5 | Daria Vaskina | Russia | 28.38 |
| | 2 | Lila Touili | France | 28.78 |
| 4 | 3 | Rhyan White | United States | 28.86 |
| 5 | 1 | Fernanda de Goeij | Brazil | 28.91 |
| 6 | 8 | Tamara Frías | Spain | 29.01 |
| 7 | 6 | Madison Broad | Canada | 29.12 |
| 8 | 7 | Diana Nazarova | Kazakhstan | 29.55 |