# 2017 European Athletics U23 Championships – Men's 400 metres

The men's 400 metres event at the 2017 European Athletics U23 Championships was held in Bydgoszcz, Poland, at Zdzisław Krzyszkowiak Stadium on 13, 14 and 15 July.

## Medalists

| Gold | Luka Janežič Slovenia |
| Silver | Karsten Warholm Norway |
| Bronze | Benjamin Lobo Vedel Denmark |

## Results
### Heats

14 July
Qualification rule: First 3 (Q) and the next 4 fastest (q) qualified for the semifinals.
| Rank | Heat | Name | Nationality | Time | Notes |
| 1 | 1 | Luka Janežič | Slovenia | 46.44 | Q |
| 2 | 4 | Karsten Warholm | Norway | 46.70 | Q |
| 3 | 4 | Maarten Stuivenberg | Netherlands | 46.75 | Q, =PB |
| 4 | 1 | Giuseppe Leonardi | Italy | 46.76 | Q |
| 5 | 4 | Kajetan Duszyński | Poland | 46.80 | Q |
| 6 | 2 | Daniele Corsa | Italy | 46.82 | Q |
| 7 | 4 | Gilles Biron | France | 46.82 | q |
| 8 | 1 | Dariusz Kowaluk | Poland | 46.87 | Q |
| 9 | 1 | Robert Parge | Romania | 46.88 | q, PB |
| 10 | 4 | Rokas Pacevičius | Lithuania | 47.09 | q, PB |
| 11 | 3 | Benjamin Lobo Vedel | Denmark | 47.19 | Q |
| 12 | 2 | Cameron Chalmers | Great Britain | 47.25 | Q |
| 13 | 4 | Andrew Mellon | Ireland | 47.38 | q |
| 14 | 1 | Michael Rossaert | Belgium | 47.44 | |
| 15 | 3 | Brayan Lopez | Italy | 47.47 | Q |
| 16 | 1 | Vincent Notz | Switzerland | 47.47 | |
| 17 | 2 | Darwin Andrés Echeverry | Spain | 47.50 | Q |
| 18 | 3 | Batuhan Altıntaş | Turkey | 47.66 | Q |
| 19 | 1 | Mateo Parlov | Croatia | 47.63 | |
| 20 | 4 | Zhivko Stoyanov | Bulgaria | 47.65 | |
| 21 | 2 | Luca Flück | Switzerland | 47.79 | |
| 22 | 3 | Harry Purcell | Ireland | 48.04 | |
| 23 | 2 | Konstadinos Koutsoukis | Greece | 48.05 | |
| 24 | 3 | Mario Gebhardt | Austria | 48.13 | |
| 25 | 2 | Gabrijel Stojanović | Croatia | 48.17 | |
| 26 | 3 | Mateo Kovačić | Croatia | 48.22 | |
| 27 | 3 | Cristian Radu | Romania | 48.26 | |
| 28 | 2 | Zeno Moraru | Romania | 48.32 | |
| 29 | 3 | Alexander Doom | Belgium | 48.52 | |
| 30 | 2 | Alessandro Gasperoni | San Marino | 50.86 | |
| 31 | 1 | Brandon Arrey | Ireland | 53.00 | |

### Semifinals

14 July
Qualification rule: First 3 (Q) and the next 2 fastest (q) qualified for the final.
| Rank | Heat | Name | Nationality | Time | Notes |
| 1 | 2 | Luka Janežič | Slovenia | 45.73 | Q |
| 2 | 2 | Benjamin Lobo Vedel | Denmark | 45.85 | Q, NU23 |
| 3 | 2 | Kajetan Duszyński | Poland | 45.98 | Q, PB |
| 4 | 1 | Karsten Warholm | Norway | 46.06 | Q |
| 5 | 1 | Daniele Corsa | Italy | 46.20 | Q |
| 6 | 1 | Cameron Chalmers | Great Britain | 46.32 | Q |
| 7 | 2 | Maarten Stuivenberg | Netherlands | 46.33 | q, PB |
| 8 | 1 | Darwin Andrés Echeverry | Spain | 46.39 | q, PB |
| 9 | 2 | Batuhan Altıntaş | Turkey | 46.49 | |
| 10 | 2 | Gilles Biron | France | 46.56 | |
| 11 | 1 | Giuseppe Leonardi | Italy | 46.60 | |
| 12 | 1 | Dariusz Kowaluk | Poland | 46.74 | |
| 13 | 1 | Rokas Pacevičius | Lithuania | 46.93 | PB |
| 14 | 1 | Robert Parge | Romania | 47.06 | |
| 15 | 2 | Brayan Lopez | Italy | 47.23 | |
| 16 | 2 | Andrew Mellon | Ireland | 47.32 | =SB |

### Final

15 July
| Rank | Lane | Name | Nationality | Time |
| | 6 | Luka Janežič | Slovenia | 45.33 |
| | 4 | Karsten Warholm | Norway | 45.75 |
| | 7 | Benjamin Lobo Vedel | Denmark | 46.08 |
| 4 | 8 | Cameron Chalmers | Great Britain | 46.29 |
| 5 | 5 | Daniele Corsa | Italy | 46.51 |
| 6 | 3 | Maarten Stuivenberg | Netherlands | 46.79 |
| 7 | 9 | Kajetan Duszyński | Poland | 46.80 |
| 8 | 2 | Darwin Andrés Echeverry | Spain | 46.92 |