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Date: 14 October 1964 / 15 October 1964 / 16 October 1964
Heats
Semi-finals
Final
| Rank | Name | Nation | Time |
| 1 | Warren "Rex" Cawley | USA | 49.6 |
| 2 | John Cooper | GBR | 50.1 |
| 3 | Salvatore Morale | ITA | 50.1 |
| 4 | Gary Knoke | AUS | 50.4 |
| 5 | James Luck | USA | 50.5 |
| 6 | Roberto Frinolli | ITA | 50.7 |
| 7 | Vasily Anisimov | URS | 51.1 |
| 8 | Wilfried Geeroms | BEL | 51.4 |
| Semi-finals | |||
| 9 | Kenneth Roche | AUS | 50.8 |
| 10 | William Hardin | USA | 50.9 |
| 11 | Victor Maldonado | VEN | 51.1 |
| 12 | Peter Warden | GBR | 51.2 |
| 13 | Ferdinand Haas | GER | 51.6 |
| 14 | Edvins Zageris | URS | 52.2 |
| 15 | Juan Carlos Dyrzka | ARG | 53.1 |
| 16 | Jaakko Tuominen | FIN | 54.0 |
| Heats | |||
| 17 | Joachim Singer | GER | 52.1 |
| 18 | Jean-Jacques Behm | FRA | 52.2 |
| 19 | Jerom Ochana | UGA | 52.4 |
| 20 | John Hogan | GBR | 52.5 |
| 21 | Robert Poirier | FRA | 52.6 |
| 22 | Valeriu Jurca | ROU | 52.7 |
| 23 | Keiki Iijima | JPN | 52.8 |
| 23 | Boguslaw Gierajewski | POL | 52.8 |
| 25 | Mamadou Sarr | SEN | 53.2 |
| 26 | Imants Kuklich | URS | 53.3 |
| 26 | Amrit Pal | IND | 53.3 |
| 28 | Keiji Ogushi | JPN | 53.6 |
| 29 | Jose Cavero | PER | 53.7 |
| 30 | Karu Selvaratnam | MAS | 53.8 |
| 30 | William Gairdner | CAN | 53.8 |
| 32 | Samir Vincent | IRQ | 54.0 |
| 33 | Kimaru Songok | KEN | 54.5 |
| 34 | Helmut Haid | AUT | 54.6 |
| 35 | Kiyoo Yui | JPN | 54.7 |
| 36 | Manzoor Ul-Haq Khan | PAK | 55.3 |
| 37 | Michael Ryan | AUS | 58.0 |
| Did not finish | |||
| Horst Giesler | GER | ||
| Disqualified | |||
| Djani Kovac | YUG | ||
| Did not start | |||
| Nicola Dagorov | BUL | ||