The men's 4 x 400 metres relay event at the 2005 European Athletics U23 Championships was held in Erfurt, Germany, at Steigerwaldstadion on 16 and 17 July.
| Gold | Witold Bańka Piotr Zrada Daniel Dąbrowski Piotr Kędzia  | |
| Silver | Andrew Steele Rhys Williams Richard Davenport Robert Tobin | |
| Bronze | Daniël Ward Daniël de Wild Sjors Kampen Robert Lathouwers |
17 July
| Rank | Nation | Competitors | Time | Notes | ||
|---|---|---|---|---|---|---|
| align=left | | 3:04.41 | ||||
| align=left | 3:04.83 | |||||
| align=left | 3:04.99 | |||||
| 4 | align=left |  | 3:05.29 | |||
| 5 | align=left | 3:05.35 | ||||
| 6 | align=left |  | 3:05.64 | |||
| 7 | align=left |  | 3:05.81 | |||
| 8 | align=left |  | 3:11.10 |
16 July
Qualified: first 3 in each heat and 2 best to the Final
| Rank | Nation | Competitors | Time | Notes | ||
|---|---|---|---|---|---|---|
| 1 | al bgcolor=ccffccign=left | | 3:07.66 | Q | ||
| 2 | align=left | 3:08.66 | Q | |||
| 3 | align=left | | 3:08.87 | Q | ||
| 4 | align=left |  | 3:09.23 | |||
| 5 | align=left |  | 3:10.55 | |||
| align=left |  | DQ |
| Rank | Nation | Competitors | Time | Notes | ||
|---|---|---|---|---|---|---|
| 1 | align=left | | 3:05.37 | Q | ||
| 2 | align=left | 3:05.51 | Q | |||
| 3 | align=left | | 3:06.13 | Q | ||
| 4 | align=left | 3:06.24 | q | |||
| 5 | align=left | | 3:06.37 | q | ||
| 6 | align=left |  | 3:07.98 |
According to an unofficial count, 55 athletes from 12 countries participated in the event.
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