The women's 4 × 400 metres relay event at the 2015 European Athletics U23 Championships was held in Tallinn, Estonia, at Kadriorg Stadium on 12 July.
| Gold | Seren Bundy-Davies Zoey Clark Victoria Ohuruogu Kirsten McAslan | |
| Silver | Małgorzata Curyło Martyna Dąbrowska Adrianna Janowicz Patrycja Wyciszkiewicz  | |
| Bronze | Yana Glotova Yuliya Spiridonova Tatyana Zotova Yekaterina Renzhina |
12 July
| Rank | Name | Nationality | Reaction Time | Time | Notes | ||
|---|---|---|---|---|---|---|---|
| align=left | Seren Bundy-Davies Zoey Clark Victoria Ohuruogu Kirsten McAslan | 0.192 | 3:30.07 | NUR | |||
| align=left | | Małgorzata Curyło Martyna Dąbrowska Adrianna Janowicz Patrycja Wyciszkiewicz | 0.172 | 3:30.24 | |||
| align=left | Yana Glotova Yuliya Spiridonova Tatyana Zotova Yekaterina Renzhina | 0.199 | 3:30.78 | ||||
| 4 | align=left | Laura Müller Luisa Valeske Anna-Sophie Bellerich Christina Hering | 0.147 | 3:32.01 | |||
| 5 | align=left |  | Viktoriya Tkachuk Anastasiya Tkachuk Olena Kolesnychenko Kateryna Klymyuk | 0.203 | 3:32.86 | ||
| 6 | align=left | Ylenia Vitale Joyce Mattagliano Giulia Teruzzi Valentina Cavalleri | 0.206 | 3:43.87 | |||
| align=left |  | Alexandra Toth Verena Preiner Ivona Dadic Carina Schrempf | 0.182 | DQ | |||
| align=left | Déborah Sananes Brigitte Ntiamoah Laura Chantrayne Aurélie Chaboudez | 0.239 | DQ |
According to an unofficial count, 32 athletes from 8 countries participated in the event.