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Summary
Quarter-final 1
| Rank | Name | Nation | Time |
| 1 | Amadou Gakou | SEN | 45.5 |
| 2 | Larry James | USA | 45.7 |
| 3 | Claver Kamanya | TAN | 46.0 |
| 4 | Ross MacKenzie | CAN | 46.1 |
| 5 | Musa Dogon-Yaro | NGR | 46.1 |
| 6 | William Campbell | GBR | 46.3 |
| 7 | Naftali Bon | KEN | 46.3 |
| 8 | Sergio Bello | ITA | 46.8 |
| Rank | Name | Nation | Time |
| 1 | Amos Omolo | UGA | 45.3 |
| 2 | Lee Evans | USA | 45.5 |
| 3 | Munyoro Nyamau | KEN | 46.1 |
| 4 | Wolfgang Muller | GDR | 46.2 |
| 5 | Jan Balachowski | POL | 46.3 |
| 6 | Rodobaldo Diaz | CUB | 46.3 |
| 7 | Juan Carlos Dyrzka | ARG | 46.8 |
| Rank | Name | Nation | Time |
| 1 | Jan Werner | POL | 45.6 |
| 2 | Martin Jellinghaus | FRG | 45.9 |
| 3 | Tegegne Bezabeh | ETH | 46.0 |
| 4 | Samuel Bugri | GHA | 46.0 |
| 5 | Clifton Forbes | JAM | 46.2 |
| 6 | Daniel Rudisha | KEN | 47.6 |
| 7 | Gilles Bertould | FRA | 48.9 |
| Rank | Name | Nation | Time |
| 1 | Ronald Freeman | USA | 45.3 |
| 2 | Andrzej Badenski | POL | 45.6 |
| 3 | Helmar Muller | FRG | 45.7 |
| 4 | Jean-Claude Nallet | FRA | 45.7 |
| 5 | Martin Winbolt-Lewis | GBR | 45.9 |
| 6 | Michael Zerbes | GDR | 46.1 |
| 7 | Mamman Makama | NGR | 46.4 |
| 8 | Pedro Grajales | COL | 46.5 |