| Final | time | | 1. Roger Black |  Great Britain | 45.08s | | 2. Thomas Schoenlebe |  East Germany | 45.13s | | 3. Jens Carlowitz | East Germany | 45.27s | | 4. Cayetano Cornet |  Spain | 45.30s | | 5. Norbert Dobeleit |  West Germany | 45.42s | | 6. Slobodan Brankovic |  Yugoslavia | 45.49s | | 7. Nenad Djurovic | Yugoslavia | 46.19s | | 8. Tomasz Jedrusik |  Poland | 46.25s |
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| Venue: Stadion Polijud. | | EC History Men 400m. |
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| Semi 1 | time | | 1. Roger Black | Great Britain | 45.46s | | 2. Thomas Schoenlebe | East Germany | 45.66s | | 3. Nenad Djurovic | Yugoslavia | 45.67s | | 4. Tomasz Jedrusik | Poland | 45.80s | | 5. Paul Sanders | Great Britain | 46.06s | | 6. Olivier Noirot |  France | 46.07s | | 7. Andrea Nuti |  Italy | 46.11s | | -. Jorg Vaihinger | West Germany | |
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| Semi 2 | time | | 1. Cayetano Cornet | Spain | 45.00s | | 2. Jens Carlowitz | East Germany | 45.15s | | 3. Norbert Dobeleit | West Germany | 45.15s | | 4. Slobodan Brankovic | Yugoslavia | 45.30s | | 5. Dejan Jovkovic | Yugoslavia | 46.07s | | 6. Dmitry Golovastov |  Soviet Union | 46.22s | | 7. Lewis Samuel | Great Britain | 46.98s | | 8. Roberto Ribaud | Italy | 47.39s |
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| Heat 1 | time | | 1. Roger Black | Great Britain | 45.53s | | 2. Slobodan Brankovic | Yugoslavia | 45.77s | | 3. Tomasz Jedrusik | Poland | 45.92s | | 4. Thomas Schonlebe | East Germany | 45.98s | | 5. Dmitry Golovastov | Soviet Union | 46.15s | | 6. Roberto Ribaud | Italy | 46.54s | | 7. Jorg Vaihinger | West Germany | 46.56s | | 8. Antonio Sanchez | Spain | 46.99s |
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| Heat 2 | time | | 1. Norbert Dobeleit | West Germany | 45.71s | | 2. Jens Carlowitz | East Germany | 46.10s | | 3. Olivier Noirot | France | 46.14s | | 4. Lewis Samuel | Great Britain | 46.74s | | 5. Dejan Jovkovic | Yugoslavia | 46.79s | | 6. Jose Luis Palacios | Spain | 46.90s | | 7. Ari Pinomaki |  Finland | 47.16s | | 8. Aleksey Petukhov | Soviet Union | 47.46s |
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| Heat 3 | time | | 1. Cayetano Cornet | Spain | 46.07s | | 2. Nenead Djurovic | Yugoslavia | 46.42s | | 3. Andrea Nuti | Italy | 46.61s | | 4. Paul Sanders | Great Britain | 46.75s | | 5. Tamas Molnar |  Hungary | 46.80s | | 6. Ajvar Ojastu | Soviet Union | 46.85s |
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