The men's 400 metres event at the 2024 African Championships in Athletics was held on 21, 22, and 23 June in Douala, Cameroon.
[1][2] Qualification: First 2 of each heat (Q) and the next 6 fastest (q) qualified for the semifinals.
Qualification: First 3 of each semifinal (Q) and the next 2 fastest (q) qualified for the final.