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

The girls' 100 metre butterfly event at the 2018 Summer Youth Olympics took place on 11 and 12 October at the Natatorium in Buenos Aires, Argentina.

## Results
### Heats

The heats were started on 11 October at 11:05.
| Rank | Heat | Lane | Name | Nationality | Time | Notes |
| 1 | 4 | 3 | Angelina Köhler | Germany | 59.99 | Q |
| 2 | 2 | 4 | Polina Egorova | Russia | 1:00.23 | Q |
| 3 | 2 | 5 | Anastasiya Shkurdai | Belarus | 1:00.48 | Q |
| 4 | 4 | 6 | Yuliia Stadnyk | Ukraine | 1:01.01 | Q |
| 5 | 3 | 8 | Natalie Kan | Hong Kong | 1:01.06 | Q |
| 6 | 4 | 5 | Lin Xintong | China | 1:01.19 | Q |
| 7 | 3 | 4 | Michaela Ryan | Australia | 1:01.30 | Q |
| 8 | 2 | 3 | Aleyna Özkan | Turkey | 1:01.41 | Q |
| 9 | 4 | 4 | Sara Junevik | Sweden | 1:01.50 | Q |
| 10 | 3 | 5 | Miriam Guevara | Mexico | 1:01.54 | Q |
| 11 | 3 | 3 | Petra Barócsai | Hungary | 1:01.83 | Q |
| 12 | 4 | 2 | Dune Coetzee | South Africa | 1:01.92 | Q |
| 13 | 1 | 4 | Beatriz Padrón | Costa Rica | 1:02.07 | Q |
| 14 | 1 | 6 | Maria Pessanha | Brazil | 1:02.11 | Q |
| 15 | 2 | 1 | Laura Lahtinen | Finland | 1:02.15 | Q |
| 16 | 2 | 8 | Kristýna Štemberová | Czech Republic | 1:02.20 | Q |
| 17 | 4 | 8 | Lismar Lyon | Venezuela | 1:02.30 | |
| 18 | 2 | 7 | Blanka Berecz | Hungary | 1:02.43 | |
| 19 | 3 | 6 | Valentina Becerra | Colombia | 1:02.45 | |
| 20 | 2 | 6 | Julia Mrozinski | Germany | 1:02.56 | |
| 20 | 3 | 7 | Lea Polonsky | Israel | 1:02.56 | |
| 22 | 1 | 3 | Gina Galloway | New Zealand | 1:02.85 | |
| 23 | 2 | 2 | Adinda Larasati Dewi | Indonesia | 1:03.02 | |
| 24 | 3 | 1 | Chen Yu-rong | Chinese Taipei | 1:03.21 | |
| 25 | 1 | 2 | Inés Marín | Chile | 1:03.37 | |
| 26 | 4 | 1 | Anicka Delgado | Ecuador | 1:03.47 | |
| 27 | 4 | 7 | Alexandra Schegoleva | Cyprus | 1:03.55 | |
| 28 | 3 | 2 | Tamara Potocká | Slovakia | 1:04.80 | |
| 29 | 1 | 7 | Theresa Hefel | Liechtenstein | 1:06.81 | |
| | 1 | 5 | Leoni Richter | Switzerland | DNS | |

### Semifinals

The semifinals were started on 11 October at 18:12.
| Rank | Heat | Lane | Name | Nationality | Time | Notes |
| 1 | 2 | 5 | Anastasiya Shkurdai | Belarus | 59.72 | Q |
| 2 | 2 | 4 | Angelina Köhler | Germany | 59.78 | Q |
| 3 | 1 | 4 | Polina Egorova | Russia | 1:00.14 | Q |
| 4 | 1 | 3 | Lin Xintong | China | 1:00.21 | Q |
| 5 | 1 | 2 | Miriam Guevara | Mexico | 1:00.36 | Q |
| 6 | 1 | 6 | Aleyna Özkan | Turkey | 1:00.77 | Q |
| 7 | 2 | 2 | Sara Junevik | Sweden | 1:00.85 | Q |
| 8 | 2 | 3 | Natalie Kan | Hong Kong | 1:01.05 | Q |
| 9 | 1 | 5 | Yuliia Stadnyk | Ukraine | 1:01.19 | |
| 10 | 2 | 6 | Michaela Ryan | Australia | 1:01.20 | |
| 11 | 1 | 7 | Dune Coetzee | South Africa | 1:01.29 | |
| 12 | 1 | 1 | Maria Pessanha | Brazil | 1:01.46 | |
| 13 | 2 | 7 | Petra Barócsai | Hungary | 1:01.95 | |
| 14 | 2 | 1 | Beatriz Padrón | Costa Rica | 1:01.99 | |
| 15 | 2 | 8 | Laura Lahtinen | Finland | 1:02.00 | |
| 16 | 1 | 8 | Kristýna Štemberová | Czech Republic | 1:02.27 | |

### Final

The final was held on 12 October at 18:11.
| Rank | Lane | Name | Nationality | Time |
| | 3 | Polina Egorova | Russia | 59.22 |
| | 5 | Angelina Köhler | Germany | 59.44 |
| | 4 | Anastasiya Shkurdai | Belarus | 59.76 |
| 4 | 6 | Lin Xintong | China | 1:00.35 |
| 5 | 1 | Sara Junevik | Sweden | 1:00.41 |
| 6 | 2 | Miriam Guevara | Mexico | 1:00.90 |
| 7 | 8 | Natalie Kan | Hong Kong | 1:01.21 |
| 8 | 7 | Aleyna Özkan | Turkey | 1:01.47 |