# Swimming at the 2018 Summer Youth Olympics – Girls' 100 metre backstroke

The girls' 100 metre backstroke event at the 2018 Summer Youth Olympics took place on 7 and 8 October at the Natatorium in Buenos Aires, Argentina.

## Results
### Heats

The heats were started on 7 October at 10:48.
| Rank | Heat | Lane | Name | Nationality | Time | Notes |
| 1 | 3 | 3 | Rhyan White | United States | 1:00.88 | Q |
| 2 | 2 | 4 | Kaylee McKeown | Australia | 1:01.29 | Q |
| 3 | 4 | 4 | Polina Egorova | Russia | 1:01.74 | Q |
| 4 | 4 | 5 | Peng Xuwei | China | 1:01.78 | Q |
| 5 | 3 | 5 | Madison Broad | Canada | 1:01.86 | Q |
| 6 | 3 | 4 | Daria Vaskina | Russia | 1:02.05 | Q |
| 7 | 2 | 3 | Tamara Frías | Spain | 1:02.13 | Q |
| 8 | 3 | 7 | Ingeborg Løyning | Norway | 1:02.50 | Q |
| 9 | 3 | 2 | Gina Galloway | New Zealand | 1:02.66 | Q |
| 10 | 3 | 6 | Anastasiya Shkurdai | Belarus | 1:02.68 | Q |
| 11 | 2 | 2 | Maria Pessanha | Brazil | 1:02.89 | Q |
| 12 | 4 | 6 | Laura Ilyés | Hungary | 1:02.97 | Q |
| 13 | 2 | 5 | Mariella Venter | South Africa | 1:03.15 | Q |
| 14 | 4 | 3 | Tatiana Salcuțan | Moldova | 1:03.16 | Q |
| 15 | 4 | 2 | Fernanda de Goeij | Brazil | 1:03.30 | Q |
| 16 | 2 | 7 | Cristina García | Spain | 1:03.54 | Q |
| 17 | 4 | 7 | Lila Touili | France | 1:03.63 | |
| 18 | 3 | 1 | Arina Baikova | Latvia | 1:04.01 | |
| 19 | 2 | 1 | Diana Nazarova | Kazakhstan | 1:04.10 | |
| 20 | 4 | 1 | Chen Szu-chi | Chinese Taipei | 1:04.17 | |
| 21 | 2 | 6 | Maryna Kolesnykova | Ukraine | 1:04.27 | |
| 22 | 3 | 8 | Andrea Hurtado | Peru | 1:04.67 | |
| 23 | 4 | 8 | Lucija Šulenta | Croatia | 1:05.82 | |
| 24 | 1 | 4 | Natalie Kan | Hong Kong | 1:06.20 | |
| 25 | 2 | 8 | Taydé Sansores | Mexico | 1:06.58 | |
| 26 | 1 | 1 | Mia Krstevska | Macedonia | 1:08.85 | |
| | 1 | 3 | Robyn Young | Eswatini | DNS | |

### Semifinals

The semifinals were started on 7 October at 18:30.
| Rank | Heat | Lane | Name | Nationality | Time | Notes |
| 1 | 2 | 5 | Polina Egorova | Russia | 1:00.92 | Q |
| 2 | 2 | 4 | Rhyan White | United States | 1:00.94 | Q |
| 3 | 1 | 3 | Daria Vaskina | Russia | 1:01.41 | Q |
| 4 | 1 | 4 | Kaylee McKeown | Australia | 1:01.51 | Q |
| 5 | 2 | 3 | Madison Broad | Canada | 1:01.66 | Q |
| 6 | 1 | 1 | Tatiana Salcuțan | Moldova | 1:02.04 | Q |
| 7 | 1 | 5 | Peng Xuwei | China | 1:02.12 | Q |
| 8 | 2 | 6 | Tamara Frías | Spain | 1:02.17 | Q |
| 9 | 2 | 8 | Fernanda de Goeij | Brazil | 1:02.48 | |
| 10 | 1 | 7 | Laura Ilyés | Hungary | 1:02.90 | |
| 11 | 2 | 7 | Maria Pessanha | Brazil | 1:03.00 | |
| 12 | 1 | 2 | Anastasiya Shkurdai | Belarus | 1:03.06 | |
| 13 | 1 | 6 | Ingeborg Løyning | Norway | 1:03.26 | |
| 14 | 1 | 8 | Cristina García | Spain | 1:03.39 | |
| 14 | 2 | 2 | Gina Galloway | New Zealand | 1:03.39 | |
| 16 | 2 | 1 | Mariella Venter | South Africa | 1:03.53 | |
* Semifinal 1

### Final

The final was held on 8 October at 19:06.
| Rank | Lane | Name | Nationality | Time |
| | 3 | Daria Vaskina | Russia | 1:00.45 |
| | 6 | Kaylee McKeown | Australia | 1:00.58 |
| | 5 | Rhyan White | United States | 1:00.60 |
| 4 | 4 | Polina Egorova | Russia | 1:01.25 |
| 5 | 2 | Madison Broad | Canada | 1:01.37 |
| 6 | 1 | Peng Xuwei | China | 1:01.44 |
| 7 | 8 | Tamara Frías | Spain | 1:01.93 |
| 8 | 7 | Tatiana Salcuțan | Moldova | 1:02.20 |