| Final | time | | | | 1. Dieter Fromm |  GDR | 1:45.98 | CR | 1:45.98 | | 2. Jozef Plachý |  TCH | 1:46.26 | | 1:46.26 | | 3. Manfred Matuschewski | GDR | 1:46.83 | | 1:46.83 | | 4. Yevgeniy Arzhanov |  URS | 1:47.1 | | | 5. Hansruedi Mumenthaler |  SUI | 1:47.2 | | | 6. Andrzej Kupczyk |  POL | 1:47.5 | | | 7. Noel Carroll |  IRL | 1:49.1 | | | 8. Erhard Schulze | GDR | 1:55.4 | |
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| History Men 800m | | World Record: Snell (NZL) 1:44.3 - 1962, Doubell (AUS) 1:44.3 - 1968 | | European Record: Kemper (FRG) 1:44.9 -1966 | | Semi-Finals | | Heats |
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Semi_Finals - Thursday 18.09 19:50 | | First 4 progress to Final. |
| Semi 1 | time | | | 1. Yevgeniy Arzhanov | URS | 1:49.2 | Q | | 2. Erhard Schulze | GDR | 1:49.4 | Q | | 3. Manfred Matuschewski | GDR | 1:49.4 | Q | | 4. Noel Carroll | IRL | 1:49.5 | Q | | 5. Andy Carter |  GBR | 1:49.6 | | | 6. Jože Međimurec |  YUG | 1:49.6 | | | 7. Stanisław Waśkiewicz | POL | 1:49.6 | | | 8. Tomás Jungwirth | TCH | 1:50.0 | |
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| Semi 2 | time | | | 1. Jozef Plachý | TCH | 1:48.9 | Q | | 2. Dieter Fromm | GDR | 1:49.0 | Q | | 3. Hansruedi Mumenthaler | SUI | 1:49.1 | Q | | 4. Andrzej Kupczyk | POL | 1:49.2 | Q | | 5. David Cropper | GBR | 1:50.0 | | | 6. Bob Adams | GBR | 1:50.9 | | | 7. Sergey Kryuchok | URS | 1:53.3 | | | 8. Kazimierz Wardak | POL | 1:57.1 | |
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Heats - Wednesday 17.09 17:00 | | First 5 and Best 1 (Sergey Kryuchok) progressed to Semi-Finals. |
| Heat 1 | time | | | 1. Erhard Schulze | GDR | 1:48.7 | Q | | 2. Bob Adams | GBR | 1:49.2 | Q | | 3. Jozef Plachý | TCH | 1:49.8 | Q | | 4. Stanisław Waśkiewicz | POL | 1:50.4 | Q | | 5. Jože Međimurec | YUG | 1:50.5 | Q | | 6. Zlatko Valchev |  BUL | 1:50.6 | |
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| Heat 2 | time | | | 1. Andrzej Kupczyk | POL | 1:50.5 | Q | | 2. David Cropper | GBR | 1:50.8 | Q | | 3. Manfred Matuschewski | GDR | 1:50.9 | Q | | 4. Yevgeniy Arzhanov | URS | 1:51.0 | Q | | 5. Tomás Jungwirth | TCH | 1:51.0 | Q | | 6. Knut Brustad |  NOR | 1:51.1 | | | 7. Rudi Simon |  BEL | 1:51.1 | | | 8. Ali Erte |  TUR | 1:53.5 | |
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| Heat 3 | time | | | 1. Dieter Fromm | GDR | 1:50.1 | Q | | 2. Hansruedi Mumenthaler | SUI | 1:50.1 | Q | | 3. Noel Carroll | IRL | 1:50.2 | Q | | 4. Andy Carter | GBR | 1:50.3 | Q | | 5. Kazimierz Wardak | POL | 1:50.3 | Q | | 6. Sergey Kryuchok | URS | 1:50.3 | Q | | 7. Michel Medinger |  LUX | 1:50.8 | |
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