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[edit]
| Gold | Luka Janežič Slovenia |
| Silver | Karsten Warholm Norway |
| Bronze | Benjamin Lobo Vedel Denmark |
Results[edit]
Heats[edit]
14 July[1]
Qualification rule: First 3 (Q) and the next 4 fastest (q) qualified for the semifinals.
Semifinals[edit]
14 July[2]
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[edit]
15 July[3]
| Rank | Lane | Name | Nationality | Time | Notes |
|---|---|---|---|---|---|
 | 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 |