# 2023 European Athletics U23 Championships – Women's 400 metres

The women's 400 metres event at the 2023 European Athletics U23 Championships was held in Espoo, Finland, at Leppävaara Stadium on 13 and 14 July.

## Records

Prior to the competition, the records were as follows:
| European U23 record | Marita Koch (GDR) | 48.60 | Turin, Italy | 4 August 1979 |
| Championship U23 record | Olga Zaytseva (RUS) | 50.72 | Erfurt, Germany | 16 July 2005 |

## Results
### Heats

Qualification rules: First 3 in each heat (Q) and the next 4 fastest (q) will qualify for the semi-finals.
| Rank | Heat | Name | Country | Time | Notes |
| 1 | 1 | Catia Gubelmann | Switzerland | 52.51 | Q, PB |
| 2 | 1 | Carmen Avilés | Spain | 52.61 | Q, PB |
| 3 | 1 | Ilaria Elvira Accame | Italy | 52.61 | Q, PB |
| 4 | 1 | Zoë Sedney | Netherlands | 52.72 | q |
| 5 | 4 | Keely Hodgkinson | Great Britain | 53.08 | Q |
| 6 | 2 | Yemi Mary John | Great Britain | 53.16 | Q |
| 7 | 3 | Berta Segura | Spain | 53.22 | Q |
| 8 | 2 | Giulia Senn | Switzerland | 53.51 | Q |
| 9 | 3 | Henriette Jæger | Norway | 53.65 | Q |
| 10 | 3 | Aleksandra Formella | Poland | 53.67 | Q |
| 11 | 4 | Katriina Wright | Finland | 53.72 | Q |
| 12 | 3 | Eleonora Foudraz | Italy | 53.72 | q |
| 13 | 2 | Veronika Drljačić | Croatia | 53.83 | Q |
| 14 | 4 | Astri Ertzgaard | Norway | 53.87 | Q |
| 15 | 2 | Tetiana Kharashchuk | Ukraine | 54.06 | q |
| 16 | 4 | Laura Elena Rami | Italy | 54.11 | q |
| 17 | 1 | Anna Orlova | Ukraine | 54.20 | PB |
| 18 | 4 | Aline Yuille | Switzerland | 54.32 | PB |
| 19 | 2 | Virág Simon | Hungary | 54.46 | |
| 20 | 3 | Ajda Kaučič | Slovenia | 54.93 | |
| 21 | 4 | Emma Maria Adnana Matyus | Romania | 55.31 | |
| 22 | 2 | Sigrid Kongssund Amlie | Norway | 56.03 | |
| 23 | 3 | Vanesa Yankova | Bulgaria | 57.01 | SB |
| 24 | 2 | Carlota Meritxell Málaga Morán | Andorra | 58.79 | |

### Semi-final

Qualification rules: First 3 in each heat (Q) and the next 2 fastest (q) will qualify for the semi-finals.
| Rank | Heat | Name | Country | Time | Notes |
| 1 | 2 | Yemi Mary John | Great Britain | 51.80 | Q |
| 2 | 1 | Zoë Sedney | Netherlands | 52.11 | Q, PB |
| 3 | 1 | Keely Hodgkinson | Great Britain | 52.44 | Q |
| 4 | 2 | Henriette Jæger | Norway | 52.78 | Q |
| 5 | 1 | Katriina Wright | Finland | 52.92 | Q |
| 6 | 1 | Berta Segura | Spain | 52.95 | q |
| 7 | 1 | Astri Ertzgaard | Norway | 52.97 | q, SB |
| 8 | 1 | Catia Gubelmann | Switzerland | 53.13 | |
| 9 | 1 | Ilaria Elvira Accame | Italy | 53.19 | |
| 10 | 2 | Giulia Senn | Switzerland | 53.20 | Q |
| 11 | 2 | Carmen Avilés | Spain | 53.56 | |
| 12 | 2 | Veronika Drljačić | Croatia | 53.83 | |
| 13 | 1 | Laura Elena Rami | Italy | 54.49 | |
| 14 | 2 | Tetiana Kharashchuk | Ukraine | 54.55 | |
| 15 | 2 | Eleonora Foudraz | Italy | 54.64 | |
| 16 | 2 | Aleksandra Formella | Poland | 54.78 | |

### Final

| Rank | Heat | Name | Country | Time | Notes |
| | 7 | Yemi Mary John | Great Britain | 51.04 | PB |
| | 6 | Henriette Jæger | Norway | 51.06 | NR |
| | 5 | Keely Hodgkinson | Great Britain | 51.76 | PB |
| 4 | 4 | Zoë Sedney | Netherlands | 52.02 | PB |
| 5 | 3 | Giulia Senn | Switzerland | 52.33 | |
| 6 | 8 | Katriina Wright | Finland | 52.65 | |
| 7 | 2 | Astri Ertzgaard | Norway | 52.95 | SB |
| 8 | 1 | Berta Segura | Spain | 53.56 | |