The men's 400 metres event at the 2023 African Games was held on 18, 19 and 20 March 2024 in Accra, Ghana.
[1] Held on 18 March Qualification: First 3 in each heat (Q) and the next 6 fastest (q) advanced to the semifinals.
[2] Held on 19 March Qualification: First 2 in each semifinal (Q) and the next 2 fastest (q) advanced to the final.
[3] Held on 20 March[4]