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Summary
Semi-final 1
| Rank | Name | Nation | Time |
| 1 | Alberto Juantorena | CUB | 45.10 |
| 2 | Alfons Brijdenbach | BEL | 45.28 |
| 3 | Maxie Parks | USA | 45.61 |
| 4 | Richard Mitchell | AUS | 45.69 |
| 5 | Bernd Herrmann | FRG | 45.94 |
| 6 | Bryan Saunders | CAN | 46.46 |
| 7 | Alfonso Diguida | ITA | 46.50 |
| 8 | Delmo Da Silva | BRA | 46.69 |
| Rank | Name | Nation | Time |
| 1 | Fred Newhouse | USA | 44.89 |
| 2 | David Jenkins | GBR | 45.20 |
| 3 | Herman Frazier | USA | 45.24 |
| 4 | Jan Werner | POL | 45.44 |
| 5 | Jerzy Pietrzyk | POL | 45.65 |
| 6 | Franz-Peter Hofmeister | FRG | 46.05 |
| 7 | Michael Solomon | TTO | 46.20 |
| 8 | Karl Honz | FRG | 46.63 |