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Summary
Quarter-final 1
| Rank | Name | Nation | Time |
| 1 | Malvin Whitfield | USA | 48.0 |
| 2 | George Rhoden | JAM | 48.6 |
| 3 | Rosalvo Ramos | BRA | 48.7 |
| 4 | Leslie Lewis | GBR | 49.2 |
| 5 | Zvonko Sabolovic | YUG | 49.5 |
| 6 | Folke Alnevik | SWE | 50.6 |
| Rank | Name | Nation | Time |
| 1 | Arthur Wint | JAM | 47.7 |
| 2 | Morris Curotta | AUS | 48.4 |
| 3 | Dennis Shore | RSA | 48.5 |
| 4 | William Roberts | GBR | 48.6 |
| 5 | Bjorn Vade | NOR | 49.7 |
| Did not start | |||
| Herman Kunnen | BEL | ||
| Rank | Name | Nation | Time |
| 1 | Herb McKenley | JAM | 48.0 |
| 2 | George Guida | USA | 48.0 |
| 3 | Rune Larsson | SWE | 48.8 |
| 4 | John Bartram | AUS | 49.9 |
| 5 | Francis Schewetta | FRA | 49.9 |
| 6 | Marko Racic | YUG | 52.1 |
| Rank | Name | Nation | Time |
| 1 | David Bolen | USA | 48.0 |
| 2 | Jimmy Reardon | IRL | 48.3 |
| 3 | Robert McFarlane | CAN | 48.4 |
| 4 | Kurt Lundquist | SWE | 48.4 |
| 5 | Derek Pugh | GBR | 48.8 |
| 6 | Jacques Lunis | FRA | 48.9 |