2023 Asian Athletics Championships – Men's 400 metres

The men's 400 metres event at the 2023 Asian Athletics Championships was held on 12 and 13 July.

Heats
Held on 12 July

Qualification rule: First 3 in each heat (Q) and the next 4 fastest (q) qualified for the semifinals.

Semifinals
Held on 12 July Qualification rule: First 3 in each heat (Q) and the next 2 fastest (q) qualified for the final.

Final
Held on 13 July