2024 World Athletics Indoor Championships – Men's 400 metres

The men's 400 metres at the 2024 World Athletics Indoor Championships took place on 1 and 2 March 2024.

Heats
Qualification: First 2 in each heat (Q) and the next 4 fastest (q) advance to the Semi-Finals

The heats were started on 1 March at 11:52.

Semifinal
Qualification: First 3 in each heat (Q) advance to the final.

The heats were started on 1 March at 21:10.

Final
The final was started on 2 March at 21:10.