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Date: 13 October 1968 / 14 October 1968 / 15 October 1968
Heats
Semi-finals
Final
| Rank | Name | Nation | Time |
| 1 | David Hemery | GBR | 48.1 |
| 2 | Gerhard Hennige | FRG | 49.0 |
| 3 | John Sherwood | GBR | 49.0 |
| 4 | Geoff Vanderstock | USA | 49.0 |
| 5 | Viacheslav Skomarokhov | URS | 49.1 |
| 6 | Ronald Whitney | USA | 49.2 |
| 7 | Rainer Schubert | FRG | 49.2 |
| 8 | Roberto Frinolli | ITA | 50.1 |
| Semi-finals | |||
| 9 | Gary Knoke | AUS | 49.6 |
| 10 | Juan Carlos Dyrzka | ARG | 49.8 |
| 11 | John Cooper | GBR | 50.8 |
| 11 | Jaakko Tuominen | FIN | 50.8 |
| 13 | Robert Poirier | FRA | 51.2 |
| 14 | Roger Johnson | NZL | 51.8 |
| 15 | Mamadou Sarr | SEN | 52.1 |
| 16 | Victor Maldonado | VEN | 52.2 |
| Heats | |||
| 17 | Kimaru Songok | KEN | 50.6 |
| 18 | Wilhelm Weistand | POL | 50.7 |
| 19 | Wilfried Geeroms | BEL | 51.2 |
| 20 | Kiyoo Yui | JPN | 51.5 |
| 20 | Wesley Brooker | CAN | 51.5 |
| 22 | William Quaye | GHA | 51.6 |
| 22 | Alejandro Sanchez | MEX | 51.6 |
| 24 | Robert McLaren | CAN | 51.8 |
| 24 | Juan Garcia | CUB | 51.8 |
| 26 | Miguel Olivera | CUB | 51.9 |
| 27 | Santiago Gordon | CHI | 52.4 |
| 28 | Georgios Birbilis | GRE | 52.6 |
| 29 | Abdul Zambrose | MAS | 53.2 |
| 30 | Mohamed Asswai | LBA | 54.3 |