# 2021 World Athletics U20 Championships – Men's 400 metres hurdles

The men's 400 metres hurdles at the 2021 World Athletics U20 Championships was held at the Kasarani Stadium on 19, 21 and 22 August.

## Records

Standing records prior to the 2021 World Athletics U20 Championships :
| World U20 Record | Danny Harris (USA) | 48.02 | Los Angeles, United States | 17 June 1984 |
| Championship Record | Kerron Clement (USA) | 48.51 | Grosseto, Italy | 16 July 2004 |
| World U20 Leading | Sean Burrell (USA) | 47.85 | Eugene, United States | 11 June 2021 |

## Results
### Heats

Qualification: First 4 of each heat (Q) and the 4 fastest times (q) qualified for the semifinals.
| Rank | Heat | Name | Nationality | Time | Note |
| 1 | 2 | Denis Novoseltsev | Authorised Neutral Athletes | 50.88 | Q |
| 2 | 1 | Roshawn Clarke | Jamaica | 50.93 | Q, PB |
| 3 | 1 | Matic Ian Guček | Slovenia | 51.27 | Q |
| 4 | 2 | Peter Kithome | Kenya | 51.31 | Q, PB |
| 5 | 1 | Alocias Kipngetich | Kenya | 51.41 | Q, PB |
| 6 | 1 | Ezekiel Nathaniel | Nigeria | 51.63 | Q, PB |
| 7 | 4 | Devontie Archer | Jamaica | 52.17 | Q |
| 8 | 4 | Gabriel Alves dos Santos | Brazil | 52.25 | Q, PB |
| 9 | 3 | Berke Akçam | Turkey | 52.40 | Q |
| 10 | 3 | Dmitrijs Ļašenko | Latvia | 52.57 | Q |
| 11 | 4 | Jakub Sobura-Durma | Poland | 52.58 | Q |
| 12 | 4 | Amir Moghaddami | Iran | 52.68 | Q, PB |
| 13 | 3 | Jorge García | Spain | 52.73 | Q |
| 14 | 5 | Oskar Edlund | Sweden | 52.77 | Q |
| 15 | 4 | Árpád Bánóczy | Hungary | 52.79 | q, PB |
| 16 | 5 | Neider Abello | Colombia | 52.87 | Q |
| 17 | 2 | Christiaan Venter | South Africa | 52.91 | Q |
| 18 | 4 | Marc Anthony Ibrahim | Lebanon | 52.95 | q |
| 19 | 3 | Dominik Škorjanc | Croatia | 52.97 | Q |
| 20 | 2 | Stjepan Jan Cik | Croatia | 53.21 | Q |
| 21 | 3 | Rostyslav Holubovych | Ukraine | 53.35 | q |
| 22 | 2 | César Parra | Venezuela | 53.47 | q |
| 23 | 5 | Danial Bibak | Iran | 54.27 | Q |
| 24 | 5 | Rohan Gautam Kamble | India | 55.00 | Q |
| 25 | 2 | Samuel Ibáñez | El Salvador | 57.03 | |
| 26 | 1 | Hardeep Kumar | India | 1:12.80 | |
| | 5 | Amar Ebed | Qatar | DQ | TR16.8 |
| | 1 | Ismail Doudai Abakar | Qatar | DQ | TR17.3.1 |
| | 3 | Dhahir Ali Al-Hamd | Iraq | DQ | TR17.3.1 |
| | 3 | Dillon Leacock | Trinidad and Tobago | DNS | |
| | 4 | Andre Erasmus | South Africa | DNS | |
| | 2 | Michal Krátký | Czech Republic | DNS | |
| | 5 | Saad Hinti | Morocco | DNS | |

### Semifinals

Qualification: First 2 of each heat (Q) and the 2 fastest times (q) qualified for the final.
| Rank | Heat | Name | Nationality | Time | Note |
| 1 | 1 | Berke Akçam | Turkey | 49.73 | Q, NU20R |
| 2 | 1 | Devontie Archer | Jamaica | 49.93 | Q, PB |
| 3 | 2 | Denis Novoseltsev | Authorised Neutral Athletes | 50.31 | Q, PB |
| 4 | 2 | Matic Ian Guček | Slovenia | 50.56 | Q, PB |
| 5 | 3 | Oskar Edlund | Sweden | 50.70 | Q, SB |
| 6 | 2 | Peter Kithome | Kenya | 50.90 | q, PB |
| 7 | 1 | Ezekiel Nathaniel | Nigeria | 51.39 | q, PB |
| 8 | 2 | Dominik Škorjanc | Croatia | 51.63 | |
| 9 | 3 | Stjepan Jan Cik | Croatia | 51.83 | Q |
| 10 | 1 | Marc Anthony Ibrahim | Lebanon | 51.90 | NU20R |
| 11 | 3 | Alocias Kipngetich | Kenya | 51.93 | |
| 12 | 3 | Roshawn Clarke | Jamaica | 51.95 | |
| 13 | 2 | Jakub Sobura-Durma | Poland | 51.99 | |
| 14 | 2 | César Parra | Venezuela | 52.12 | PB |
| 15 | 1 | Neider Abello | Colombia | 52.34 | PB |
| 16 | 3 | Amir Moghaddami | Iran | 52.40 | PB |
| 17 | 1 | Dmitrijs Ļašenko | Latvia | 52.49 | |
| 18 | 2 | Rohan Gautam Kamble | India | 52.88 | |
| 19 | 1 | Árpád Bánóczy | Hungary | 53.47 | |
| 20 | 3 | Rostyslav Holubovych | Ukraine | 54.04 | |
| 21 | 3 | Christiaan Venter | South Africa | 54.71 | |
| 22 | 3 | Gabriel Alves dos Santos | Brazil | 56.09 | |
| | 1 | Danial Bibak | Iran | DQ | TR17.3.1 |
| | 2 | Jorge García | Spain | DQ | TR22.6.2 |

### Final

The final was held on 22 August at 15:00. Swedish athlete Oskar Edlund crossed the line first in a time of 49.20 seconds, but was later disqualified for pulling one of his legs outside his lane to clear a hurdle.
| Rank | Lane | Name | Nationality | Time | Note |
| | 3 | Berke Akçam | Turkey | 49.38 | NU20R |
| | 6 | Denis Novoseltsev | Authorised Neutral Athletes | 49.62 | PB |
| | 5 | Devontie Archer | Jamaica | 49.78 | PB |
| 4 | 1 | Ezekiel Nathaniel | Nigeria | 49.89 | PB |
| 5 | 8 | Matic Ian Guček | Slovenia | 50.80 | |
| 6 | 2 | Peter Kithome | Kenya | 50.94 | |
| 7 | 7 | Stjepan Jan Cik | Croatia | 52.60 | |
| | 4 | Oskar Edlund | Sweden | DQ | TR22.6.2 |