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

Results

Heats
Qualification: First 4 of each heat (Q) and the 4 fastest times (q) qualified for the semifinals. Semifinals
Qualification: First 2 of each heat (Q) and the 2 fastest times (q) qualified for the final. Final
The final was held on 22 August at 15:00. References

400 metres hurdles
400 metres hurdles at the World Athletics U20 Championships