| Final | time | L | | 1. Willi Wulbeck |  FRG | 1:43.65 | | 2. Rob Druppers |  NED | 1:44.20 | | 3. Joaquim Cruz |  BRA | 1:44.27 | | 4. Peter Elliott |  GBR | 1:44.87 | | 5. James Robinson |  USA | 1:45.12 | | 6. Agberto Guimaraes | BRA | 1:45.46 | | 7. Hans-Peter Ferner | FRG | 1:45.74 | | 8. David Patrick | USA | 1:46.56 |
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| Semi 1 | time | | 1. Joaquim Cruz | BRA | 1:45.62 | | 2. James Robinson | USA | 1:46.16 | | 3. Philippe Dupont |  FRA | 1:46.36 | | 4. Viktor Kalinkin |  URS | 1:46.83 | | 5. Mike Solomon |  TRI | 1:47.10 | | 6. Matthias Assmann | FRG | 1:48.73 | | 7. Mike Hillardt |  AUS | 1:49.64 | | -. Alberto Juantorena |  CUB | DNS |
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| Semi 2 | time | | 1. Willi Wulbeck | FRG | 1:46.21 | | 2. Agberto Guimaraes | BRA | 1:46.37 | | 3. Jose Marajo | FRA | 1:46.39 | | 4. David Mack | USA | 1:46.39 | | 5. Coloman Trabado |  ESP | 1:46.85 | | 6. Garry Cook | GBR | 1:47.48 | | 7. Sammy Koskei |  KEN | 1:48.92 | | 8. Binko Kolev |  BUL | 1:50.23 |
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| Semi 3 | time | | 1. Hans-Peter Ferner | FRG | 1:45.24 | | 2. David Patrick | USA | 1:45.30 | | 3. Peter Elliott | GBR | 1:45.38 | | 4. Rob Druppers | NED | 1:45.55 | | 5. Detlef Wagenknecht |  GDR | 1:45.70 | | 6. Peter Pearless |  NZL | 1:47.82 | | 7. Jose Luiz Barbosa | BRA | 1:48.05 | | 8. Jorma Harkonen |  FIN | 1:49.39 |
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| Heat 1 | time | | 1. James Robinson | USA | 1:46.32 | | 2. Garry Cook | GBR | 1:46.44 | | 3. Viktor Kalinkin | URS | 1:46.57 | | 4. Christoph Ulmer |  SUI | 1:47.98 | | 5. Jama Aden |  SOM | 1:48.69 | | 6. Paul Gilbert | AUS | 1:51.39 | | 7. Khaled Khalifa |  KUW | 1:52.84 | | 8. Sekou Camara |  GUI | 1:59.90 |
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| Heat 2 | time | | 1. Matthias Assmann | FRG | 1:47.45 | | 2. Jose Luiz Barbosa | BRA | 1:47.47 | | 3. Binko Kolev | BUL | 1:47.49 | | 4. Peter Bourke | AUS | 1:48.15 | | 5. Petru Dragoescu |  ROU | 1:48.33 | | 6. Bo Breigan |  NOR | 1:49.53 | | 7. Mohammed Darwish |  IRQ | 1:50.68 |
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| Heat 3 | time | | 1. Willi Wulbeck | FRG | 1:46.55 | | 2. Philippe Dupont | FRA | 1:46.62 | | 3. David Patrick | USA | 1:46.76 | | 4. Babacar Niang |  SEN | 1:47.54 | | 5. Donato Sabia |  ITA | 1:47.62 | | 6. Sotirios Moutsanas |  GRE | 1:48.23 | | 7. Vincent Confait |  SEY | 1:55.04 | | 8. Jean-Marie Rudasinqwa |  RWA | 1:55.12 |
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| Heat 4 | time | | 1. Detlef Wagenknecht | GDR | 1:49.20 | | 2. Sammy Koskei | KEN | 1:49.35 | | 3. Omer Khalifa |  SUD | 1:49.67 | | 4. Ronny Olsson |  SWE | 1:49.72 | | 5. Simon Hoogewerf |  CAN | 1:49.92 | | -. Charlie Oliver |  SOL | DNS | | -. Ryszard Ostrowski |  POL | DNS |
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| Heat 5 | time | | 1. Agberto Guimaraes | BRA | 1:48.30 | | 2. Alberto Juantorena | CUB | 1:48.40 | | 3. Juma Ndiwa | KEN | 1:48.40 | | 4. Mohamed Zahafi |  MAR | 1:49.43 | | 5. Gordan Hinds |  BAR | 1:50.92 | | 6. Didier Le Guillou | FRA | 1:52.49 | | 7. Ruthsel Martina |  AHO | 1:55.67 |
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| Heat 6 | time | | 1. David Mack | USA | 1:45.84 | | 2. Jorma Harkonen | FIN | 1:46.39 | | 3. Peter Elliott | GBR | 1:46.53 | | 4. Jose Marajo | FRA | 1:46.78 | | 5. Coloman Trabado | ESP | 1:47.10 | | 6. Bock-Ju Kim |  KOR | 1:48.40 | | 7. Tisbite Rakotoarisoa |  MAD | 1:50.70 | | 8. Antonio Cadio Paraiso |  STP | 1:58.47 |
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| Heat 7 | time | | 1. Rob Druppers | NED | 1:46.12 | | 2. Joaquim Cruz | BRA | 1:46.12 | | 3. Peter Pearless | NZL | 1:47.22 | | 4. Mike Solomon | TRI | 1:47.30 | | 5. Faouzi Lahbi | MAR | 1:47.76 | | 6. Gawain Guy |  JAM | 1:49.19 | | 7. John Chappory |  GIB | 1:52.30 |
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| Heat 8 | time | | 1. Hans-Peter Ferner | FRG | 1:48.34 | | 2. Mike Hillardt | AUS | 1:48.44 | | 3. James Maina Boi | KEN | 1:48.69 | | 4. Mark Handelsman |  ISR | 1:49.02 | | 5. Mohamed Alouini |  TUN | 1:49.09 | | 6. William Wuyke |  VEN | 1:50.71 | | 7. Luis Ramirez |  NCA | 1:55.77 | | 8. Clive Williams |  BIZ | 2:03.64 |
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