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Summary
Quarter-final 1
| Rank | Name | Nation | Time |
| 1 | Louis Jones | USA | 47.4 |
| 1 | John Salisbury | GBR | 47.4 |
| 3 | Ivan Rodriguez | PUR | 47.5 |
| 4 | Terry Tobacco | CAN | 47.7 |
| 5 | Jurgen Kuhl | GER | 48.0 |
| Did not start | |||
| Abdullah Khan | PAK | ||
| Rank | Name | Nation | Time |
| 1 | Ardalion Ignatyev | URS | 46.8 |
| 2 | Malcolm Spence | JAM | 47.4 |
| 3 | Peter Higgins | GBR | 47.4 |
| 4 | Graham Gipson | AUS | 47.4 |
| 5 | Jacques Degats | FRA | 48.7 |
| 6 | Murray Cockburn | CAN | 49.5 |
| Rank | Name | Nation | Time |
| 1 | Voitto Hellsten | FIN | 46.8 |
| 2 | Malcolm Spence | RSA | 47.1 |
| 3 | Melville Spence | JAM | 47.3 |
| 4 | Pierre Haarhoff | FRA | 47.6 |
| 5 | James Lea | USA | 48.1 |
| 6 | Kibet Boit | KEN | 49.1 |
| Rank | Name | Nation | Time |
| 1 | Kevan Gosper | AUS | 46.7 |
| 2 | Karl-Friedrich Haas | GER | 47.3 |
| 3 | Charles Jenkins | USA | 47.5 |
| 4 | George Kerr | JAM | 47.7 |
| 5 | Michael Wheeler | GBR | 47.9 |
| 6 | Jean-Paul Martin du Gard | FRA | 48.2 |