| Final | time | age | | 1. Ralph Doubell |  AUS | 1:44.3 | | 2. Wilson Kiprugut |  KEN | 1:44.5 | | 3. Tom Farrell |  USA | 1:45.4 | | 4. Walter Adams |  FRG | 1:45.8 | | 5. Josef Plachy |  TCH | 1:45.9 | | 6. Dieter Fromm |  GDR | 1:46.2 | | 7. Thomas Saisi | KEN | 1:47.5 | | 8. Benedict Cayenne |  TRI | 1:54.3 |
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| Heat 1 | time | | 1. Walter Adams | FRG | 1:46.4 | | 2. Dieter Fromm | GDR | 1:46.5 | | 3. Thomas Saisi | KEN | 1:46.6 | | 4. Benedict Cayenne | TRI | 1:46.8 | | 5. Ronald Kutschinski | USA | 1:47.3 | | 6. Jean Dufresne |  FRA | 1:51.8 | | -. Eugeny Arzhanov |  URS | DNS | | -. Henryk Szordykowski |  POL | DNS |
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| Semi 2 | time | | 1. Ralph Doubell | AUS | 1:45.7 | | 2. Wilson Kiprugut | KEN | 1:45.8 | | 3. Josef Plachy | TCH | 1:45.9 | | 4. Thomas Farrell | USA | 1:46.1 | | 5. Robert Ouko | KEN | 1:47.1 | | 6. Byron Dyce |  JAM | 1:47.2 | | 7. Franz-Josef Kemper | FRG | 1:47.3 | | 8. David Cropper |  GBR | 1:47.6 |
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| Heat 1 | time | | 1. Thomas Saisi | KEN | 1:47.0 | | 2. Jean Dufresne | FRA | 1:47.6 | | 3. Matias Habtemichael |  ETI | 1:49.6 | | 4. Papa N'Diaye |  SEN | 1:51.3 | | 5. Wade Bell | USA | 1:51.5 | | 6. Robert Honti |  HUN | 1:53.8 |
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| Heat 2 | time | | 1. Dieter Fromm | GDR | 1:46.9 | | 2. Franz-Josef Kemper | FRG | 1:47.0 | | 3. Ronald Kutschinski | USA | 1:47.6 | | 4. Subramaniom Ramasamy |  MAL | 1:50.8 | | 5. Gilbert Van Manshoven |  BEL | 1:52.3 |
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| Heat 3 | time | | 1. Walter Adams | FRG | 1:48.4 | | 2. Josef Plachy | TCH | 1:48.6 | | 3. Noel Carroll | IRL | 1:49.0 | | 4. Ahmet Issa | CHA | 1:49.0 | | 5. Roberto Silva | MEX | 1:50.4 | | 6. Gerd Larsen | DEN | 1:51.9 |
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| Heat 4 | time | | 1. Ralph Doubell | AUS | 1:47.2 | | 2. Henryk Szordykowski | POL | 1:47.4 | | 3. Robert Ouko | KEN | 1:47.6 | | 4. John Ametepey |  GHA | 1:50.7 | | 4. Gilles Sibon | FRA | 1:50.8 | | 6. Christopher Carter | GBR | 1:52.9 | | 7. Jose L'Oficial |  DOM | 1:55.6 | | 8. Alfredo Cubias |  SAL | 2:08.7 |
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| Heat 5 | time | | 1. Wilson Kiprugut | KEN | 1:46.1 | | 2. Thomas Farrell | USA | 1:47.9 | | 3. Tomas Jungwirth | TCH | 1:48.7 | | 4. Anders Garderud |  SUE | 1:48.9 | | 5. Jun Nagai |  JPN | 1:51.2 | | 6. Hussein Angelo |  SUD | 1:53.4 | | 7. Jacques Pennewaret | BEL | 1:53.8 | | 8. Francisco Menocal |  NIC | 1:58.9 |
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| Heat 6 | time | | 1. David Cropper | GBR | 1:47.9 | | 2. Benedict Cayenne | TRI | 1:48.2 | | 3. Eugeny Arzhanov | URS | 1:48.4 | | 4. Byron Dyce | JAM | 1:48.5 | | 5. Sebsibe Mamo |  ETH | 1.49.7 | | 6. Gianni Del Buono |  ITA | 1:50.2 | | 7. Xaver Frick |  LIE | 1:52.6 | | 8. Carlos Baez |  PUR | 1:52.6 |
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