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Summary
Semi-final 1
| Rank | Name | Nation | Time |
| 1 | Arthur Wint | JAM | 46.3 |
| 2 | Morris Curotta | AUS | 47.2 |
| 3 | Malvin Whitfield | USA | 47.4 |
| 4 | George Rhoden | JAM | 47.7 |
| 5 | Jimmy Reardon | IRL | 47.8 |
| Did not start | |||
| Rune Larsson | SWE | ||
| Rank | Name | Nation | Time |
| 1 | Herb McKenley | JAM | 47.3 |
| 2 | David Bolen | USA | 47.9 |
| 3 | George Guida | USA | 48.3 |
| 4 | Dennis Shore | RSA | 48.8 |
| 5 | Rosalvo Ramos | BRA | 49.1 |
| 6 | Robert McFarlane | CAN | 51.7 |