The girls' 50 metre butterfly event at the 2010 Youth Olympic Games took place on August 17–18, at the Singapore Sports School.
| 26.97 | ||
| 27.06 | ||
| 27.31 |
| Rank | Lane | Name | Nationality | Time | Notes | |
|---|---|---|---|---|---|---|
| 1 | 6 | Lovisa Eriksson | 27.44 | Q | ||
| 2 | 4 | Liu Lan | 27.81 | Q | ||
| 3 | 2 | Anna Santamans | 27.94 | Q | ||
| 4 | 5 | Katarina Listopadova | 28.06 | Q | ||
| 5 | 3 | Rachael Kelly | 28.14 | Q | ||
| 6 | 1 | Aina Filsrabetsara | 30.54 | |||
| 7 | 7 | Sonia Aktar | 32.93 |
| Rank | Lane | Name | Nationality | Time | Notes | |
|---|---|---|---|---|---|---|
| 1 | 4 | Elena di Liddo | 27.25 | Q | ||
| 2 | 3 | Bruna Rocha | 28.23 | Q | ||
| 3 | 2 | Zoe Johnson | 28.40 | Q | ||
| 4 | 5 | Anna Schegoleva | 28.57 | Q | ||
| 5 | 6 | Bryndis Run Hansen | 28.60 | Q | ||
| 6 | 7 | Khadeja Phillip | 30.04 | |||
| 7 | 8 | Kathryn Millin | 30.31 | |||
| 8 | 1 | Surennyam Erdenebileg | 36.12 |
| Rank | Lane | Name | Nationality | Time | Notes | |
|---|---|---|---|---|---|---|
| 1 | 2 | Katja Hajdinjak | 28.17 | Q | ||
| 1 | 3 | Lindsay Delmar | 28.17 | Q | ||
| 3 | 5 | Anna Marti | 28.26 | Q | ||
| 4 | 6 | Danielle Villars | 28.64 | Q | ||
| 5 | 4 | Lena Kalla | 28.75 | Q | ||
| 6 | 7 | Amanda Lim | 29.48 | Q | ||
| 7 | 1 | Sabine Hazboun | 31.88 | |||
| 8 | 8 | Reni Jani | 34.43 |
| Rank | Lane | Name | Nationality | Time | Notes | |
|---|---|---|---|---|---|---|
| 1 | 4 | Lovisa Eriksson | 27.27 | Q | ||
| 2 | 5 | Anna Santamans | 27.51 | Q | ||
| 3 | 3 | Rachael Kelly | 27.67 | Q | ||
| 4 | 6 | Katja Hajdinjak | 27.76 | Q | ||
| 5 | 2 | Anna Marti | 28.25 | |||
| 6 | 1 | Danielle Villars | 28.59 | |||
| 7 | 7 | Anna Schegoleva | 28.80 | |||
| 8 | 8 | Amanda Lim | 29.34 |
| Rank | Lane | Name | Nationality | Time | Notes | |
|---|---|---|---|---|---|---|
| 1 | 4 | Elena di Liddo | 26.88 | Q | ||
| 2 | 5 | Liu Lan | 27.15 | Q | ||
| 3 | 3 | Katarina Listopadova | 27.79 | Q | ||
| 4 | 6 | Lindsay Delmar | 28.02 | Q | ||
| 5 | 2 | Bruna Rocha | 28.09 | |||
| 6 | 8 | Lena Kalla | 28.31 | |||
| 7 | 7 | Zoe Johnson | 28.43 | |||
| 8 | 1 | Bryndis Run Hansen | 28.53 |
| Rank | Lane | Name | Nationality | Time | Notes | |
|---|---|---|---|---|---|---|
| 5 | Liu Lan | 26.97 | ||||
| 4 | Elena di Liddo | 27.06 | ||||
| 6 | Anna Santamans | 27.31 | ||||
| 4 | 1 | Katarina Listopadova | 27.38 | |||
| 5 | 8 | Lindsay Delmar | 27.54 | |||
| 6 | 3 | Lovisa Eriksson | 27.55 | |||
| 7 | 2 | Rachael Kelly | 27.77 | |||
| 8 | 7 | Katja Hajdinjak | 27.86 |