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Summary
Quarter-final 1
| Rank | Name | Nation | Time |
| 1 | Wendell Mottley | TTO | 45.8 |
| 2 | Ollan Cassell | USA | 46.2 |
| 3 | Jean-Pierre Boccardo | FRA | 46.3 |
| 4 | Peter Vassella | AUS | 46.5 |
| 5 | Peter Laeng | SUI | 46.7 |
| 6 | Sergio Bello | ITA | 46.9 |
| 7 | Ebenezer Quartey | GHA | 47.0 |
| 8 | Muhamad Sadiq | PAK | 48.0 |
| Rank | Name | Nation | Time |
| 1 | Andrzej Badenski | POL | 46.5 |
| 2 | William Crothers | CAN | 46.7 |
| 3 | Timothy Graham | GBR | 46.8 |
| 4 | Lawrence Kahn | JAM | 46.9 |
| 5 | Josef Trousil | TCH | 47.2 |
| 6 | Johannes Schmitt | GER | 47.2 |
| 7 | Kenneth Roche | AUS | 48.0 |
| 8 | Grigory Sverbetov | URS | 48.0 |
| Rank | Name | Nation | Time |
| 1 | Michael Larrabee | USA | 46.5 |
| 2 | Kent Bernard | TTO | 46.7 |
| 3 | Robbie Brightwell | GBR | 47.1 |
| 4 | Jorg Juttner | GER | 47.2 |
| 5 | Rupert Hoilette | JAM | 47.6 |
| 6 | Gary Eddy | AUS | 47.6 |
| 7 | Wilson Kiprugut | KEN | 47.7 |
| 8 | Vadim Arkhipchuk | URS | 47.9 |
| Rank | Name | Nation | Time |
| 1 | Edwin Skinner | TTO | 46.9 |
| 2 | Ulis Williams | USA | 46.9 |
| 3 | Tegegne Bezabeh | ETH | 47.2 |
| 4 | James Addy | GHA | 47.3 |
| 5 | Adrian Metcalfe | GBR | 47.8 |
| 6 | Pedro Grajales | COL | 47.8 |
| 7 | Viktor Bychkov | URS | 47.9 |
| Did not start | |||
| Ireneusz Kluczek | POL | ||