The men's 100 metres event at the 2005 European Athletics U23 Championships was held in Erfurt, Germany, at Steigerwaldstadion on 14 and 16 July.
| Gold | Oudéré Kankarafou | |
| Silver | Eddy De Lépine | |
| Bronze | Stefan Wieser |
16 July
Wind: 2.4 m/s
| Rank | Name | Nationality | Time | Notes | |||
|---|---|---|---|---|---|---|---|
| align=left | align=left | | 10.26 w | ||||
| align=left | align=left | | 10.30 w | ||||
| align=left | align=left | 10.32 w | |||||
| 4 | align=left | align=left |  | 10.34 w | |||
| 5 | align=left | align=left | 10.35 w | ||||
| 6 | align=left | align=left | 10.39 w | ||||
| 7 | align=left | align=left |  | 10.43 w | |||
| 8 | align=left | align=left | 10.52 w |
14 July
Qualified: first 3 in each heat and 2 best to the Final
Wind: -0.9 m/s
| Rank | Name | Nationality | Time | Notes | |||
|---|---|---|---|---|---|---|---|
| 1 | align=left | align=left | 10.42 | Q | |||
| 2 | align=left | align=left | | 10.50 | Q | ||
| 3 | align=left | align=left | 10.52 | Q | |||
| 4 | align=left | align=left | | 10.52 | q | ||
| 5 | align=left | align=left | | 10.60 | q | ||
| 6 | align=left | align=left | | 10.62 | |||
| 7 | align=left | align=left | | 10.69 | |||
| 8 | align=left | align=left |  | 10.79 |
Wind: -2.0 m/s
| Rank | Name | Nationality | Time | Notes | |||
|---|---|---|---|---|---|---|---|
| 1 | align=left | align=left | | 10.52 | Q | ||
| 2 | align=left | align=left | 10.56 | Q | |||
| 3 | align=left | align=left | 10.59 | Q | |||
| 4 | align=left | align=left | | 10.60 | |||
| 5 | align=left | align=left | | 10.64 | |||
| 6 | align=left | align=left | | 10.82 | |||
| 7 | align=left | align=left |  | 10.87 | |||
| align=left | align=left |  | DNF |
According to an unofficial count, 16 athletes from 8 countries participated in the event.
(1) (3) (1) (3) (3) (1)