The girls' 50 metre backstroke event at the 2010 Youth Olympic Games took place on August 18–19, at the Singapore Sports School.
| 29.19 | ||
| 29.34 | ||
| 29.51 |
| Rank | Lane | Name | Nationality | Time | Notes | |
|---|---|---|---|---|---|---|
| 1 | 5 | Alexandra Papusha | 29.64 | Q | ||
| 2 | 6 | Isabella Arcila | 30.05 | Q | ||
| 3 | 4 | Klaudia Nazieblo | 30.07 | Q | ||
| 4 | 3 | Siona Huxley | 30.86 | Q | ||
| 5 | 2 | Kendese Nangle | 31.09 | Q | ||
| 6 | 8 | Amel Melih | 31.75 | Q | ||
| 7 | 7 | Sylvia Tanya Atieno | 32.90 | |||
| 8 | 1 | Yanet Gebremedhin | 38.96 |
| Rank | Lane | Name | Nationality | Time | Notes | |
|---|---|---|---|---|---|---|
| 1 | 4 | Daryna Zevina | 29.79 | Q | ||
| 2 | 5 | Sarah Rolko | 30.26 | Q | ||
| 3 | 6 | Lotta Nevalainen | 30.32 | Q | ||
| 4 | 3 | Juanita Barreto | 30.48 | Q | ||
| 5 | 2 | Monica Ramirez Abella | 30.80 | Q | ||
| 6 | 7 | Anahit Barseghyan | 32.79 | |||
| 7 | 1 | Rohane Crichton | 35.30 |
| Rank | Lane | Name | Nationality | Time | Notes | |
|---|---|---|---|---|---|---|
| 1 | 3 | Mathilde Cini | 29.70 | Q | ||
| 2 | 5 | Lovisa Eriksson | 29.71 | Q | ||
| 3 | 4 | Yekaterina Rudenko | 30.75 | Q | ||
| 4 | 2 | Ting Chen | 30.88 | Q | ||
| 5 | 7 | Adeline Winata | 31.43 | Q | ||
| 6 | 1 | Karlene Theodora | 33.03 | |||
| 7 | 6 | Daoheuang Inthavong | 41.22 |
| Rank | Lane | Name | Nationality | Time | Notes | |
|---|---|---|---|---|---|---|
| 1 | 4 | Mathilde Cini | 29.22 | Q | ||
| 2 | 5 | Daryna Zevina | 29.51 | Q | ||
| 3 | 3 | Klaudia Nazieblo | 29.91 | Q | ||
| 4 | 2 | Yekaterina Rudenko | 30.09 | Q | ||
| 5 | 6 | Lotta Nevalainen | 30.22 | Q | ||
| 6 | 1 | Kendese Nangle | 30.91 | |||
| 7 | 7 | Siona Huxley | 30.98 | |||
| 8 | 8 | Amel Melih | 31.82 |
| Rank | Lane | Name | Nationality | Time | Notes | |
|---|---|---|---|---|---|---|
| 1 | 4 | Alexandra Papusha | 29.55 | Q | ||
| 2 | 5 | Lovisa Eriksson | 29.82 | Q | ||
| 3 | 6 | Sarah Rolko | 30.35 | Q | ||
| 4 | 3 | Isabella Arcila | 30.42 | SUB | ||
| 5 | 2 | Juanita Barreto | 30.76 | |||
| 6 | 7 | Monica Ramirez Abella | 30.82 | |||
| 7 | 1 | Ting Chen | 31.03 | |||
| 8 | 8 | Adeline Winata | 31.48 |
Lovisa Eriksson (SWE) dropped out and was replaced by Isabella Arcila (COL).
| Rank | Lane | Name | Nationality | Time | Notes | |
|---|---|---|---|---|---|---|
| 4 | Mathilde Cini | 29.19 | ||||
| 5 | Daryna Zevina | 29.34 | ||||
| 3 | Alexandra Papusha | 29.51 | ||||
| 4 | 6 | Klaudia Nazieblo | 29.57 | |||
| 5 | 2 | Yekaterina Rudenko | 29.65 | |||
| 6 | 1 | Sarah Rolka | 30.17 | |||
| 7 | 8 | Isabella Arcila | 30.31 | |||
| 8 | 7 | Lotta Nevalainen | 30.35 |