# 2021 European Athletics U23 Championships – Men's 400 metres

The men's 400 metres event at the 2021 European Athletics U23 Championships was held in Tallinn, Estonia, at Kadriorg Stadium on 8, 9 and 10 July.

## Records

Prior to the competition, the records were as follows:
| European U23 record | Thomas Schönlebe (GDR) | 44.33 | Rome, Italy | 3 September 1987 |
| Championship U23 record | Leslie Djhone (FRA) | 45.04 | Bydgoszcz, Poland | 19 July 2003 |

## Results
### Round 1

Qualification rule: First 4 in each heat (Q) and the next 4 fastest (q) advance to the Semi-Finals.
| Rank | Heat | Name | Nationality | Time | Notes |
| 1 | 2 | Ricky Petrucciani | Switzerland | 45.95 | Q |
| 2 | 5 | Mihai Sorin Dringo | Romania | 46.30 | Q |
| 3 | 4 | Jonathan Sacoor | Belgium | 46.34 | Q |
| 4 | 2 | Edoardo Scotti | Italy | 46.41 | Q |
| 5 | 4 | Mihai Cristian Pislaru | Romania | 46.42 | Q |
| 6 | 3 | Oleksandr Pohorilko | Ukraine | 46.45 | Q |
| 7 | 1 | Ericsson Tavares | Portugal | 46.61 | Q, PB |
| 8 | 2 | Ludovic Oucéni | France | 46.62 | Q |
| 9 | 1 | Javier Sánchez | Spain | 46.70 | Q |
| 10 | 1 | Alex Haydock-Wilson | Great Britain | 46.70 | Q |
| 11 | 1 | Boško Kijanović | Serbia | 46.72 | Q, SB |
| 12 | 5 | Bernat Erta | Spain | 46.81 | Q |
| 13 | 3 | João Coelho | Portugal | 46.85 | Q |
| 14 | 4 | Netanel Dorothea | Netherlands | 46.91 | Q |
| 15 | 2 | Oliver Murcko | Slovakia | 46.93 | Q |
| 16 | 3 | Lionel Spitz | Switzerland | 46.96 | Q |
| 17 | 4 | Lovro Mesec Košir | Slovenia | 47.00 | Q, SB |
| 18 | 5 | Matěj Krsek | Czech Republic | 47.15 | Q |
| 19 | 5 | Riccardo Meli | Italy | 47.22 | Q |
| 20 | 1 | Gregor Grahovac | Slovenia | 47.33 | q |
| 21 | 5 | Ioannis Ntetsikas | Greece | 47.36 | q, PB |
| 22 | 3 | Jure Grkman | Slovenia | 47.37 | Q |
| 23 | 3 | Matteo Raimondi | Italy | 47.44 | q |
| 23 | 4 | Iļja Petrušenko | Latvia | 47.44 | q |
| 25 | 5 | Mykyta Barabanov | Ukraine | 47.58 | |
| 26 | 3 | Daniel Lehár | Czech Republic | 47.70 | |
| 27 | 2 | Jakub Majercák | Czech Republic | 47.72 | |
| 28 | 1 | Andreas Haara Bakketun | Norway | 47.90 | |
| 29 | 2 | Yaroslav Demchenko | Ukraine | 47.95 | |
| 30 | 4 | Filippo Moggi | Switzerland | 48.02 | |
| 31 | 5 | Karl-Oskar Pajus | Estonia | 49.19 | |
| 32 | 3 | Senad Ramadani | North Macedonia | 51.82 | |
| | 2 | Jack Raftery | Ireland | DNF | DNF |

### Semifinals

Qualification rule: First 2 in each heat (Q) and the next 2 fastest (q) advance to the Final.
| Rank | Heat | Name | Nationality | Time | Notes |
| 1 | 1 | Ricky Petrucciani | Switzerland | 45.72 | Q |
| 2 | 3 | Jonathan Sacoor | Belgium | 45.77 | Q, SB |
| 3 | 3 | Edoardo Scotti | Italy | 45.84 | Q |
| 4 | 1 | Mihai Cristian Pislaru | Romania | 45.89 | Q, =PB |
| 5 | 3 | Bernat Erta | Spain | 46.00 | q |
| 6 | 3 | Oleksandr Pohorilko | Ukraine | 46.04 | q, PB |
| 7 | 2 | Mihai Sorin Dringo | Romania | 46.16 | Q |
| 8 | 2 | Ludovic Oucéni | France | 46.23 | Q |
| 9 | 1 | João Coelho | Portugal | 46.29 | PB |
| 10 | 1 | Alex Haydock-Wilson | Great Britain | 46.40 | |
| 11 | 3 | Boško Kijanović | Serbia | 46.47 | PB |
| 12 | 1 | Netanel Dorothea | Netherlands | 46.61 | |
| 13 | 2 | Ericsson Tavares | Portugal | 46.62 | |
| 14 | 2 | Oliver Murcko | Slovakia | 46.65 | SB |
| 15 | 2 | Javier Sánchez | Spain | 46.71 | |
| 16 | 2 | Lionel Spitz | Switzerland | 46.90 | |
| 17 | 1 | Lovro Mesec Košir | Slovenia | 46.99 | SB |
| 18 | 1 | Iļja Petrušenko | Latvia | 47.17 | PB |
| 19 | 3 | Matěj Krsek | Czech Republic | 47.18 | |
| 20 | 3 | Gregor Grahovac | Slovenia | 47.24 | |
| 21 | 2 | Jure Grkman | Slovenia | 47.27 | |
| 22 | 3 | Ioannis Ntetsikas | Greece | 47.53 | |
| 23 | 1 | Riccardo Meli | Italy | 47.83 |
| | 2 | Matteo Raimondi | Italy | DNS | DNS |

### Final

| Rank | Lane | Name | Nationality | Time | Notes |
| | 6 | Ricky Petrucciani | Switzerland | 45.02 | CR |
| | 3 | Jonathan Sacoor | Belgium | 45.17 | SB |
| | 5 | Edoardo Scotti | Italy | 45.68 | SB |
| 4 | 1 | Oleksandr Pohorilko | Ukraine | 45.87 | PB |
| 5 | 4 | Mihai Sorin Dringo | Romania | 45.93 | PB |
| 6 | 8 | Ludovic Oucéni | France | 45.93 | PB |
| 7 | 2 | Bernat Erta | Spain | 46.01 | |
| 8 | 7 | Mihai Cristian Pislaru | Romania | 46.67 | |