The men's 400 metres event at the Friendship Games was held on 17 August 1984 at the Grand Arena of the Central Lenin Stadium in Moscow, Soviet Union.
| Rank | Name | Nationality | Time | Notes | |
|---|---|---|---|---|---|
| 44.78 | |||||
| 45.51 | |||||
| 45.52 | PB | ||||
| 46.01 | |||||
| 46.12 | |||||
| 46.23 | |||||
| 46.76 | |||||
| 46.82 | |||||
| 49.46 | |||||
| 10 | M. Ralambu | 50.49 | |||
| 11 | 50.87 | ||||
| 12 | A. Bah Abdoul | 51.00 | |||
| 13 | B. Tousi | 51.10 | |||
| 14 | M. Daud | 52.31 | |||
| 15 | A. A. Zakir | 52.31 | |||
| 16 | 53.79 |