2018 African Championships in Athletics – Men's 400 metres

The men's 400 metres event at the 2018 African Championships in Athletics was held on 2 and 3 August in Asaba, Nigeria.

Heats
Qualification: First 4 of each heat (Q) and the next 4 fastest (q) qualified for the semifinals.

Semifinals
Qualification: First 2 of each semifinal (Q) and the next 2 fastest (q) qualified for the final.