The women's 400 metres hurdles event at the 2015 European Athletics U23 Championships was held in Tallinn, Estonia, at Kadriorg Stadium on 10, 11 and 12 July.
| Gold | Elise Malmberg | |
| Silver | Stina Troest | |
| Bronze | Aurélie Chaboudez |
12 July
| Rank | Name | Nationality | Reaction Time | Time | Notes | |||
|---|---|---|---|---|---|---|---|---|
| align=left | align=left | | 0.198 | 55.88 | PB | |||
| align=left | align=left | 0.165 | 56.01 | |||||
| align=left | align=left | | 0.226 | 56.04 | ||||
| 4 | align=left | align=left | 0.153 | 56.05 | PB | |||
| 5 | align=left | align=left |  | 0.177 | 56.36 | NUR | ||
| 6 | align=left | align=left |  | 0.164 | 56.83 | SB | ||
| 7 | align=left | align=left | | 0.243 | 57.58 | |||
| 8 | align=left | align=left | 0.240 | 58.14 |
11 July
| Rank | Name | Nationality | Reaction Time | Time | Notes | |||
|---|---|---|---|---|---|---|---|---|
| 1 | align=left | align=left | 0.164 | 55.91 | Q | |||
| 2 | align=left | align=left | | 0.186 | 56.86 | Q | ||
| 3 | align=left | align=left | | 0.131 | 56.86 | Q | ||
| 4 | align=left | align=left | | 0.264 | 56.97 | SB q | ||
| 5 | align=left | align=left | 0.179 | 56.99 | SB q | |||
| 6 | align=left | align=left | | 0.189 | 58.52 | |||
| 7 | align=left | align=left |  | 0.209 | 59.53 | |||
| 8 | align=left | align=left |  | 59.89 |
| Rank | Name | Nationality | Reaction Time | Time | Notes | |||
|---|---|---|---|---|---|---|---|---|
| 1 | align=left | align=left | | 0.166 | 56.60 | NUR Q | ||
| 2 | align=left | align=left | 0.233 | 56.62 | PB Q | |||
| 3 | align=left | align=left | | 0.219 | 56.97 | Q | ||
| 4 | align=left | align=left | | 0.199 | 57.30 | |||
| 5 | align=left | align=left |  | 0.215 | 58.02 | SB | ||
| 6 | align=left | align=left | | 0.194 | 58.25 | |||
| 7 | align=left | align=left | 0.198 | 58.60 | ||||
| 8 | align=left | align=left |  | 0.211 | 59.37 |
10 July
| Rank | Name | Nationality | Reaction Time | Time | Notes | |||
|---|---|---|---|---|---|---|---|---|
| 1 | align=left | align=left | 0.169 | 57.40 | Q | |||
| 2 | align=left | align=left | 0.160 | 57.42 | Q | |||
| 3 | align=left | align=left | | 0.242 | 58.18 | Q | ||
| 4 | align=left | align=left | | 0.227 | 59.03 | q | ||
| 5 | align=left | align=left | | 0.195 | 59.29 | SB q | ||
| 6 | align=left | align=left | | 0.168 | 60.15 | |||
| 7 | align=left | align=left |  | 0.196 | 60.59 |
| Rank | Name | Nationality | Reaction Time | Time | Notes | |||
|---|---|---|---|---|---|---|---|---|
| 1 | align=left | align=left | | 0.211 | 58.02 | Q | ||
| 2 | align=left | align=left | | 0.186 | 58.61 | Q | ||
| 3 | align=left | align=left | | 0.200 | 58.93 | Q | ||
| 4 | align=left | align=left | 0.192 | 59.21 | q | |||
| 5 | align=left | align=left | | 0.248 | 59.29 | q | ||
| 6 | align=left | align=left |  | 0.175 | 59.78 | |||
| 7 | align=left | align=left |  | 0.140 | 61.62 |
| Rank | Name | Nationality | Reaction Time | Time | Notes | |||
|---|---|---|---|---|---|---|---|---|
| 1 | align=left | align=left | | 0.175 | 58.24 | Q | ||
| 2 | align=left | align=left | | 0.151 | 58.51 | Q | ||
| 3 | align=left | align=left | | 0.203 | 58.64 | Q | ||
| 4 | align=left | align=left | | 0.196 | 59.47 | PB | ||
| 5 | align=left | align=left |  | 0.160 | 60.03 | |||
| 6 | align=left | align=left |  | 0.148 | 60.49 | |||
| 7 | align=left | align=left | | 0.212 | 64.36 |
| Rank | Name | Nationality | Reaction Time | Time | Notes | |||
|---|---|---|---|---|---|---|---|---|
| 1 | align=left | align=left | | 0.198 | 57.91 | Q | ||
| 2 | align=left | align=left | 0.273 | 58.49 | Q | |||
| 3 | align=left | align=left | | 0.183 | 58.50 | Q | ||
| 4 | align=left | align=left |  | 59.29 | ||||
| 5 | align=left | align=left | | 0.166 | 59.90 | PB | ||
| 6 | align=left | align=left | 0.197 | 60.35 | ||||
| 7 | align=left | align=left | 0.207 | 61.90 |
According to an unofficial count, 28 athletes from 20 countries participated in the event.