The Men's 400 metres hurdles event at the 2011 European Athletics U23 Championships was held in Ostrava, Czech Republic, at Městský stadion on 14, 15 and 16 July.
| Gold | Jack Green | |
| Silver | Nathan Woodward | |
| Bronze | Emir Bekrić |
16 July 2011 / 16:15
| Rank | Name | Nationality | Lane | Reaction Time | Time | Notes | |||
|---|---|---|---|---|---|---|---|---|---|
| align=left | align=left | 7 | 0.194 | 49.13 | |||||
| align=left | align=left | 6 | 0.178 | 49.28 | |||||
| align=left | align=left | | 3 | 0.198 | 49.61 | NR | |||
| 4 | align=left | align=left |  | 5 | 0.180 | 49.62 | PB | ||
| 5 | align=left | align=left |  | 1 | 0.202 | 49.76 | PB | ||
| 6 | align=left | align=left | 2 | 0.201 | 49.97 | PB | |||
| 7 | align=left | align=left |  | 8 | 0.225 | 50.28 | PB | ||
| 8 | align=left | align=left | 4 | 0.188 | 50.32 |
Qualified: First 2 in each heat (Q) and 2 best performers (q) advance to the Final
| Rank | Name | Nationality | Time | Notes | |||
|---|---|---|---|---|---|---|---|
| 1 | align=left | align=left | 49.59 | Q | |||
| 2 | align=left | align=left | | 50.12 | Q PB | ||
| 3 | align=left | align=left | 50.16 | Q | |||
| 4 | align=left | align=left | 50.21 | q PB | |||
| 5 | align=left | align=left | | 50.31 | Q PB | ||
| 6 | align=left | align=left | | 50.41 | Q | ||
| 7 | align=left | align=left | | 50.45 | q | ||
| 8 | align=left | align=left | 50.56 | PB | |||
| 9 | align=left | align=left | 50.86 | Q | |||
| 10 | align=left | align=left |  | 51.09 | PB | ||
| 10 | align=left | align=left |  | 51.09 | |||
| 12 | align=left | align=left | | 51.10 | PB | ||
| 13 | align=left | align=left |  | 51.31 | |||
| 14 | align=left | align=left | 51.70 | ||||
| 15 | align=left | align=left |  | 51.76 | |||
| 16 | align=left | align=left | | 51.77 | |||
| 17 | align=left | align=left |  | 51.93 | |||
| 18 | align=left | align=left | 51.97 | ||||
| 19 | align=left | align=left | | 52.44 | |||
| 20 | align=left | align=left | 52.55 | ||||
| 21 | align=left | align=left |  | 52.59 | |||
| 22 | align=left | align=left |  | 52.65 | |||
| 23 | align=left | align=left | 52.69 | ||||
| 24 | align=left | align=left | | 53.41 |
15 July 2011 / 15:50
| Rank | Name | Nationality | Lane | Reaction Time | Time | Notes | |||
|---|---|---|---|---|---|---|---|---|---|
| 1 | align=left | align=left | 6 | 0.169 | 49.59 | Q | |||
| 2 | align=left | align=left | | 5 | 0.182 | 50.12 | Q PB | ||
| 3 | align=left | align=left | 4 | 0.193 | 50.21 | q PB | |||
| 4 | align=left | align=left | | 7 | 0.232 | 51.09 | PB | ||
| 5 | align=left | align=left | | 8 | 0.224 | 51.10 | PB | ||
| 6 | align=left | align=left | 2 | 0.182 | 51.70 | ||||
| 7 | align=left | align=left | | 3 | 0.179 | 52.44 | |||
| 8 | align=left | align=left | | 1 | 0.160 | 52.65 |
15 July 2011 / 15:56
| Rank | Name | Nationality | Lane | Reaction Time | Time | Notes | |||
|---|---|---|---|---|---|---|---|---|---|
| 1 | align=left | align=left | 4 | 0.234 | 50.16 | Q | |||
| 2 | align=left | align=left | | 7 | 0.292 | 50.31 | Q PB | ||
| 3 | align=left | align=left | | 6 | 0.269 | 50.45 | q | ||
| 4 | align=left | align=left | 3 | 0.188 | 50.56 | PB | |||
| 5 | align=left | align=left | | 5 | 0.241 | 51.31 | |||
| 6 | align=left | align=left | | 8 | 0.198 | 51.77 | |||
| 7 | align=left | align=left | | 1 | 0.239 | 51.93 | |||
| 8 | align=left | align=left | 2 | 0.188 | 51.97 |
15 July 2011 / 16:02
| Rank | Name | Nationality | Lane | Reaction Time | Time | Notes | |||
|---|---|---|---|---|---|---|---|---|---|
| 1 | align=left | align=left | | 5 | 0.239 | 50.41 | Q | ||
| 2 | align=left | align=left | 4 | 0.216 | 50.86 | Q | |||
| 3 | align=left | align=left | | 6 | 0.253 | 51.09 | |||
| 4 | align=left | align=left | | 7 | 0.286 | 51.76 | |||
| 5 | align=left | align=left | 2 | 0.204 | 52.55 | ||||
| 6 | align=left | align=left | | 3 | 0.226 | 52.59 | |||
| 7 | align=left | align=left | 8 | 0.220 | 52.69 | ||||
| 8 | align=left | align=left | | 1 | 0.180 | 53.41 |
Qualified: First 4 in each heat (Q) and 4 best performers (q) advance to the Semifinals
| Rank | Name | Nationality | Time | Notes | |||
|---|---|---|---|---|---|---|---|
| 1 | align=left | align=left | 50.85 | Q | |||
| 2 | align=left | align=left | | 50.96 | Q | ||
| 2 | align=left | align=left | | 50.96 | Q | ||
| 4 | align=left | align=left | | 50.99 | Q | ||
| 5 | align=left | align=left | 51.14 | Q | |||
| 6 | align=left | align=left | 51.23 | Q | |||
| 7 | align=left | align=left | | 51.24 | Q PB | ||
| 8 | align=left | align=left | | 51.27 | Q SB | ||
| 9 | align=left | align=left | | 51.29 | Q | ||
| 10 | align=left | align=left | 51.30 | Q | |||
| 11 | align=left | align=left | | 51.33 | Q | ||
| 12 | align=left | align=left | 51.42 | Q | |||
| 13 | align=left | align=left | | 51.46 | Q | ||
| 14 | align=left | align=left | | 51.56 | Q | ||
| 15 | align=left | align=left | | 51.59 | Q | ||
| 16 | align=left | align=left | 51.66 | q | |||
| 17 | align=left | align=left | | 51.72 | Q | ||
| 18 | align=left | align=left | 51.75 | q SB | |||
| 19 | align=left | align=left | | 51.77 | Q | ||
| 20 | align=left | align=left | 51.78 | Q | |||
| 21 | align=left | align=left | | 51.86 | q | ||
| 22 | align=left | align=left | 51.87 | Q | |||
| 23 | align=left | align=left | | 51.90 | Q | ||
| 24 | align=left | align=left | | 51.97 | q SB | ||
| 25 | align=left | align=left | | 52.04 | |||
| 26 | align=left | align=left |  | 52.07 | |||
| 26 | align=left | align=left | 52.07 | ||||
| 28 | align=left | align=left |  | 52.09 | |||
| 29 | align=left | align=left |  | 52.21 | PB | ||
| 30 | align=left | align=left | | 52.72 | |||
| 31 | align=left | align=left | | 52.82 | |||
| 31 | align=left | align=left |  | 52.82 | |||
| 33 | align=left | align=left |  | 53.77 | |||
| align=left | align=left | | DNS |
14 July 2011 / 12:00
| Rank | Name | Nationality | Lane | Reaction Time | Time | Notes | |||
|---|---|---|---|---|---|---|---|---|---|
| 1 | align=left | align=left | | 5 | 0.200 | 50.96 | Q | ||
| 2 | align=left | align=left | | 3 | 0.189 | 50.99 | Q | ||
| 3 | align=left | align=left | | 6 | 0.244 | 51.27 | Q SB | ||
| 4 | align=left | align=left | | 8 | 0.217 | 51.77 | Q | ||
| 5 | align=left | align=left | | 4 | 0.188 | 51.86 | q | ||
| 6 | align=left | align=left | | 7 | 0.167 | 51.97 | q SB | ||
| align=left | align=left | | 2 | DNS |
14 July 2011 / 12:07
| Rank | Name | Nationality | Lane | Reaction Time | Time | Notes | |||
|---|---|---|---|---|---|---|---|---|---|
| 1 | align=left | align=left | 4 | 0.197 | 51.14 | Q | |||
| 2 | align=left | align=left | 5 | 0.174 | 51.42 | Q | |||
| 3 | align=left | align=left | | 6 | 0.181 | 51.72 | Q | ||
| 4 | align=left | align=left | 3 | 0.192 | 51.78 | Q | |||
| 5 | align=left | align=left | 7 | 0.192 | 52.07 | ||||
| 6 | align=left | align=left | | 8 | 0.214 | 52.82 | |||
| 7 | align=left | align=left | | 2 | 0.202 | 53.77 |
14 July 2011 / 12:14
| Rank | Name | Nationality | Lane | Reaction Time | Time | Notes | |||
|---|---|---|---|---|---|---|---|---|---|
| 1 | align=left | align=left | | 3 | 0.236 | 50.96 | Q | ||
| 2 | align=left | align=left | | 4 | 0.283 | 51.46 | Q | ||
| 3 | align=left | align=left | 6 | 0.175 | 51.87 | Q | |||
| 4 | align=left | align=left | | 2 | 0.198 | 51.90 | Q | ||
| 5 | align=left | align=left | | 5 | 0.198 | 52.04 | |||
| 6 | align=left | align=left | | 7 | 0.182 | 52.09 |
14 July 2011 / 12:21
| Rank | Name | Nationality | Lane | Reaction Time | Time | Notes | |||
|---|---|---|---|---|---|---|---|---|---|
| 1 | align=left | align=left | 3 | 0.182 | 51.23 | Q | |||
| 2 | align=left | align=left | | 6 | 0.210 | 51.29 | Q | ||
| 3 | align=left | align=left | | 4 | 0.212 | 51.56 | Q | ||
| 4 | align=left | align=left | | 5 | 0.211 | 51.59 | Q | ||
| 5 | align=left | align=left | 7 | 0.198 | 51.75 | q SB | |||
| 6 | align=left | align=left | | 2 | 0.161 | 52.07 | |||
| 7 | align=left | align=left | | 8 | 0.153 | 52.72 |
14 July 2011 / 12:28
| Rank | Name | Nationality | Lane | Reaction Time | Time | Notes | |||
|---|---|---|---|---|---|---|---|---|---|
| 1 | align=left | align=left | 5 | 0.187 | 50.85 | Q | |||
| 2 | align=left | align=left | | 4 | 0.176 | 51.24 | Q PB | ||
| 3 | align=left | align=left | 6 | 0.192 | 51.30 | Q | |||
| 4 | align=left | align=left | | 3 | 0.228 | 51.33 | Q | ||
| 5 | align=left | align=left | 2 | 0.189 | 51.66 | q | |||
| 6 | align=left | align=left | | 7 | 0.228 | 52.21 | PB | ||
| 7 | align=left | align=left | | 8 | 0.207 | 52.82 |
According to an unofficial count, 33 athletes from 20 countries participated in the event.