The women's 4 x 400 metres relay event at the 2003 European Athletics U23 Championships was held in Bydgoszcz, Poland, at Zawisza Stadion on 20 July.
| Gold | Yuliya Gushchina Natalya Ivanova Oksana Gulumyan Tatyana Firova  | |
| Silver | Jennifer Meadows Danielle Halsall Kim Wall Helen Karagounis | |
| Bronze | Eileen Müller Katharina Gröb Tina Kron Claudia Hoffmann |
20 July
| Rank | Nation | Competitors | Time | Notes | ||
|---|---|---|---|---|---|---|
| align=left | | 3:29.55 | ||||
| align=left | 3:30.44 | |||||
| align=left | 3:33.59 | |||||
| 4 | align=left |  | 3:33.63 | |||
| 5 | align=left |  | 3:34.04 |
According to an unofficial count, 20 athletes from 5 countries participated in the event.
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