The men's 100 metres event at the 2003 European Athletics U23 Championships was held in Bydgoszcz, Poland, at Zawisza Stadion on 17 and 19 July.
| Gold | Ronald Pognon | |
| Silver | Argo Golberg | |
| Bronze | Fabrice Calligny |
19 July
Wind: 1.2 m/s
| Rank | Name | Nationality | Time | Notes | |||
|---|---|---|---|---|---|---|---|
| align=left | align=left | | 10.19 | CR | |||
| align=left | align=left | | 10.28 | ||||
| align=left | align=left | | 10.34 | ||||
| 4 | align=left | align=left |  | 10.35 | |||
| 5 | align=left | align=left |  | 10.35 | |||
| 6 | align=left | align=left | | 10.40 | |||
| 7 | align=left | align=left |  | 10.49 | |||
| 8 | align=left | align=left | 10.52 |
17 July
Qualified: first 2 in each heat and 2 best to the Final
Wind: 0.1 m/s
| Rank | Name | Nationality | Time | Notes | |||
|---|---|---|---|---|---|---|---|
| 1 | align=left | align=left | | 10.36 | Q | ||
| 2 | align=left | align=left | | 10.36 | Q | ||
| 3 | align=left | align=left |  | 10.60 | |||
| 4 | align=left | align=left |  | 10.60 | |||
| 5 | align=left | align=left |  | 11.36 | |||
| align=left | align=left |  | DNS |
Wind: 0.0 m/s
| Rank | Name | Nationality | Time | Notes | |||
|---|---|---|---|---|---|---|---|
| 1 | align=left | align=left | | 10.30 | Q | ||
| 2 | align=left | align=left | | 10.32 | Q | ||
| 3 | align=left | align=left |  | 10.63 | |||
| 4 | align=left | align=left |  | 10.70 | |||
| 5 | align=left | align=left | 10.77 | ||||
| 6 | align=left | align=left |  | 10.80 |
Wind: -0.2 m/s
| Rank | Name | Nationality | Time | Notes | |||
|---|---|---|---|---|---|---|---|
| 1 | align=left | align=left | | 10.40 | Q | ||
| 2 | align=left | align=left | | 10.47 | Q | ||
| 3 | align=left | align=left | | 10.49 | q | ||
| 4 | align=left | align=left | 10.52 | q | |||
| 5 | align=left | align=left |  | 10.61 | |||
| 6 | align=left | align=left | 10.83 |
According to an unofficial count, 17 athletes from 14 countries participated in the event.
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