The men's 400 metres event at the 2002 African Championships in Athletics was held in Radès, Tunisia on August 6–8.[1]
| width=200 bgcolor=gold | Gold | width=200 bgcolor=silver | Silver | width=200 bgcolor=CC9966 | Bronze |
| Eric Milazar | Sofiane Labidi | Marcus la Grange |
| Rank | Heat | Name | Nationality | Time | Notes | |
|---|---|---|---|---|---|---|
| 1 | 5 | 46.45 | Q | |||
| 2 | 5 | 46.56 | Q | |||
| 3 | 2 | 46.69 | Q | |||
| 4 | 5 | 46.72 | q | |||
| 5 | 2 | 46.75 | Q | |||
| 6 | 5 | 46.83 | q | |||
| 7 | 1 | 47.22 | Q | |||
| 8 | 2 | 47.41 | q | |||
| 9 | 4 | 47.65 | Q | |||
| 10 | 3 | 47.69 | Q | |||
| 11 | 4 | 47.74 | Q | |||
| 12 | 1 | 47.75 | Q | |||
| 13 | 3 | 48.13 | Q | |||
| 14 | 4 | 48.37 | q | |||
| 15 | 2 | 48.54 | q | |||
| 16 | 1 | 48.56 | q | |||
| 17 | 5 | 48.72 | ||||
| 18 | 3 | 48.77 | ||||
| 19 | 4 | 48.93 | ||||
| 20 | 5 | 49.27 | ||||
| 21 | 1 | 49.36 | ||||
| 22 | 4 | 50.40 | ||||
| 23 | 5 | 50.46 | ||||
| 24 | 3 | 50.80 | ||||
| 25 | 2 | 54.81 | ||||
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| Rank | Heat | Name | Nationality | Time | Notes | |
|---|---|---|---|---|---|---|
| 1 | 1 | 45.98 | Q | |||
| 2 | 1 | 46.07 | Q | |||
| 3 | 1 | 46.09 | Q | |||
| 4 | 2 | 46.53 | Q | |||
| 5 | 1 | 46.55 | Q | |||
| 6 | 2 | 46.64 | Q | |||
| 7 | 2 | 46.70 | Q | |||
| 8 | 2 | 46.80 | Q | |||
| 9 | 2 | 47.04 | ||||
| 10 | 1 | 47.38 | ||||
| 11 | 1 | 47.77 | ||||
| 12 | 1 | 48.09 | ||||
| 13 | 2 | 48.36 | ||||
| 14 | 1 | 48.43 | ||||
| 15 | 2 | 48.76 | ||||
| 2 |
| Rank | Name | Nationality | Time | Notes | |
|---|---|---|---|---|---|
| 45.67 | |||||
| 45.87 | |||||
| 45.95 | |||||
| 4 | 46.26 | ||||
| 5 | 47.03 | ||||
| 6 | 47.26 | ||||
| 7 | |||||