| Final 18:50 | time | | | 1. David Jenkins |  GBR | 45.45s | CR NR | | 2. Marcello Fiasconaro |  ITA | 45.49s | CR NR | | 3. Jan Werner |  POL | 45.57s | | | 4. Markku Kukkoaho |  FIN | 45.74s | NR | | 5. Thomas Jordan |  FRG | 46.01s | | | 6. Hermann Köhler | FRG | 46.07s | | | 7. Aleksandr Bratchikov |  URS | 46.40s | | | 8. Klaus Hauke |  GDR | 46.88s | |
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| History Men 400m | | Qualification Standard: 46.4s |
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Semi-Finals - Thursday 12.08 17:00 | | First 4 progress to Final. |
| Semi 1 | time | & | | 1. Thomas Jordan | FRG | 46.29s | Q | | 2. Hermann Köhler | FRG | 46.44s | Q | | 3. Marcello Fiasconaro | ITA | 46.44s | Q | | 4. Aleksandr Bratchikov | URS | 46.66s | Q | | 5. Andrzej Badeński | POL | 46.80s | | | 6. Per Rom |  NOR | 46.92s | | | 7. Miroslav Tulis |  TCH | 47.05s | | | 8. Michael Fredriksson |  SWE | 48.4s | |
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| Semi 2 | time | & | | 1. Jan Werner | POL | 46.11s | Q | | 2. David Jenkins | GBR | 46.22s | Q | | 3. Markku Kukkoaho | FIN | 46.25s | Q | | 4. Klaus Hauke | GDR | 46.38s | Q | | 5. Martin Jellinghaus | FRG | 46.78s | | | 6. Gilles Bertould |  FRA | 47.23s | | | 7. Fanahan McSweeney |  IRL | 47.69s | | | -. Waldemar Korycki | POL | DNS | |
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| Heat 1 | time | & | | 1. Jan Werner | POL | 46.44s | Q | | 2. Marcello Fiasconaro | ITA | 46.49s | Q | | 3. Gilles Bertould | FRA | 46.81s | Q | | 4. Miroslav Tulis | TCH | 46.83s | Q | | 5. Semyon Kocher | URS | 46.90s | | | 6. M. Kocuvan |  YUG | 47.6s | | | -. Alberto Matos |  POR | DNS | | | -. M. Guneygif |  TUR | DNS | |
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| Heat 2 | time | & | | 1. David Jenkins | GBR | 46.66s | Q | | 2. Andrzej Badeński | POL | 46.68s | Q | | 3. Per Rom | NOR | 46.73s | Q | | 4. Hermann Köhler | FRG | 46.77s | Q | | 5. Yevgeniy Borisenko | URS | 47.12s | | | 6. Christian Nicolau | FRA | 47.12s | | | 6. Miro Kocuvan | YUG | 47.63s | | | 7. Anders Faager | SWE | 47.32s | |
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| Heat 3 | time | & | | 1. Klaus Hauke | GDR | 46.84s | Q | | 2. Martin Jellinghaus | FRG | 46.96s | Q | | 3. Waldemar Korycki | POL | 47.10s | Q | | 4. Michael Fredriksson | SWE | 47.44s | Q | | 5. Giacomo Puosi | ITA | 47.63s | | | 6. Hugues Roger | FRA | 47.75s | | | 7. John Robertson | GBR | 48.20s | |
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| Heat 4 | time | & | | 1. Markku Kukkoaho | FIN | 46.72s | Q | | 2. Thomas Jordan | FRG | 46.98s | Q | | 3. Aleksandr Bratchikov | URS | 47.21s | Q | | 4. Fanahan McSweeney | IRL | 47.34s | Q | | 5. René Bervoets |  BEL | 47.42s | | | 6. Martin Bilham | GBR | 48.13s | | | -. L. Susanj | YUG | DNS | |
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