The men's 4 x 100 metres relay event at the 2003 European Athletics U23 Championships was held in Bydgoszcz, Poland, at Zawisza Stadion on 19 and 20 July.
| Gold | Tyrone Edgar Chris Lambert Darren Chin Dwayne Grant | |
| Silver | Daniel Adolia Fabrice Calligny David Socrier Leslie Djhone  | |
| Bronze | Pieter-Jan Vereecke François Gourmet Kristof Beyens Xavier de Baerdemaeker  |
20 July
| Rank | Nation | Competitors | Time | Notes | ||
|---|---|---|---|---|---|---|
| align=left | 39.31 | |||||
| align=left | | 39.38 | ||||
| align=left | | 39.54 | ||||
| 4 | align=left |  | 39.64 | |||
| 5 | align=left |  | 39.69 | |||
| 6 | align=left |  | 40.28 | |||
| align=left |  | DNF | ||||
| align=left |  | DNF |
19 July
Qualified: first 3 in each heat and 2 best to the Final
| Rank | Nation | Competitors | Time | Notes | ||
|---|---|---|---|---|---|---|
| 1 | align=left | | 39.65 | Q | ||
| 2 | align=left | | 39.71 | Q | ||
| 3 | align=left | | 40.15 | Q | ||
| 4 | align=left |  | 40.33 | |||
| 5 | align=left | 40.72 |
| Rank | Nation | Competitors | Time | Notes | ||
|---|---|---|---|---|---|---|
| 1 | align=left | | 39.63 | Q | ||
| 2 | align=left | | 39.91 | Q | ||
| 3 | align=left | 40.02 | Q | |||
| 4 | align=left | | 40.19 | q | ||
| 5 | align=left | | 40.27 | q | ||
| 6 | align=left | 40.52 |
According to an unofficial count, 49 athletes from 11 countries participated in the event.
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