The women'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 | Nataliya Pyhyda Iryna Shepetyuk Olena Chebanu Marina Maydanova  | |
| Silver | Anna Radoszewska Daria Onyśko Dorota Dydo Małgorzata Flejszar  | |
| Bronze | Tanja Kuckelkorn Lisa Schorr Katja Wakan Nadine Hentschke |
20 July
| Rank | Nation | Competitors | Time | Notes | ||
|---|---|---|---|---|---|---|
| align=left | | 44.29 | ||||
| align=left | | 44.51 | ||||
| align=left | 44.59 | |||||
| 4 | align=left |  | 44.71 | |||
| 5 | align=left |  | 44.82 | |||
| 6 | align=left | 44.87 | ||||
| 7 | align=left |  | 44.94 | |||
| 8 | align=left | 45.69 |
19 July
Qualified: first 3 in each heat and 2 best to the Final
| Rank | Nation | Competitors | Time | Notes | ||
|---|---|---|---|---|---|---|
| 1 | align=left | | 45.20 | Q | ||
| 2 | align=left | 45.35 | Q | |||
| 3 | align=left | 45.41 | Q | |||
| 4 | align=left | | 45.59 | q | ||
| 5 | align=left | 46.21 | q |
| Rank | Nation | Competitors | Time | Notes | ||
|---|---|---|---|---|---|---|
| 1 | align=left | | 44.34 | Q | ||
| 2 | align=left | | 44.55 | Q | ||
| 3 | align=left | | 45.29 | Q | ||
| align=left |  | DQ |
According to an unofficial count, 38 athletes from 9 countries participated in the event.
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