| Final 17:45 | time | | | 1. Derek Pugh |  GBR | 47.3s | CR | | 2. Jacques Lunis |  FRA | 47.6s | | | 3. Lars-Erik Wolfbrandt |  SWE | 47.9s | | | 4. Guðmundur Lárusson |  ISL | 48.1s | | | 5. Leslie Lewis | GBR | 48.7s | | | 6. Luigi Paterlini |  ITA | 48.9s | |
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| History Men 400m | | -- Competitors from -- Nations. | | Venue: Heysel Stadium. |
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Semi-Finals Thusday 24.08 17:25 | | First 3 prograssed to Final. |
| Heat 1 | time | | | 1. Jacques Lunis | FRA | 47.8s | Q | | 2. Leslie Lewis | GBR | 47.9s | Q | | 3. Guðmundur Lárusson | ISL | 48.0s | NR Q | | 4. Gösta Brännström | SWE | 48.5s | | | 5. Antonio Siddi | ITA | 48.9s | | | 6. Ragnar Graeffe |  FIN | 49.5s | |
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| Heat 2 | time | | | 1. Derek Pugh | GBR | 48.6s | Q | | 2. Lars-Erik Wolfbrandt | SWE | 48.8s | Q | | 3. Luigi Paterlini | ITA | 49.2s | Q | | 4. Rolf Back | FIN | 49.2s | | | 5. Oscar Soetewey |  BEL | 51.4s | | | 6. René Leroux | FRA | DNS | |
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Heats Wednesday 23.08 18:30 |
| Heat 1 | time | | | 1. Leslie Lewis | GBR | 49.8s | Q | | 2. Ragnar Graeffe | FIN | 50.1s | Q | | -. Canekudis |  GRE | | | -. Asmundur Bjarnason | ISL | |
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| Heat 2 | time | | | 1. Derek Pugh | GBR | 49.5s | Q | | 2. Guðmundur Lárusson | ISL | 49.8s | Q | | -. Kilirenko |  URS | | | -. Gudmundur Larusson | ISL | |
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| Heat 3 | time | | | 1. Jacques Lunis | FRA | 48.9s | Q | | 2. Gösta Brännström | SWE | 49.7s | Q | | 3. Jean-Baptiste Peeters | BEL | 50.8s | | | -. Rasouin |  LUX | | | 5. Siddi | ITA | |
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| Heat 4 | time | | | 1. Lars-Erik Wolfbrandt | SWE | 48.8s | Q | | 2. Rolf Back | FIN | 49.0s | Q | | 3. Aleš Poděbrad |  CZE | 49.7s | | | -. Moina |  ROU | |
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| Heat 5 | time | | | 1. Luigi Paterlini | ITA | 49.0s | Q | | 2. René Leroux | FRA | 49.3s | Q | | 3. Zvonko Sabolović |  YUG | 49.5s | | | -. Acarbay |  TUR | |
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| Heat 6 | time | | | 1. Antonio Siddi | ITA | 49.7s | Q | | 2. Oscar Soetewey | BEL | 49.8s | Q | | 3. Lazar Milosevski | YUG | 50.6s | | | -. Komarovski | URS | |
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