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Date: 4 August 1948 / 5 August 1948
Heats
Quarter-finals
Semi-finals
Final
| Rank | Name | Nation | Time |
| 1 | Arthur Wint | JAM | 46.2 |
| 2 | Herb McKenley | JAM | 46.4 |
| 3 | Malvin Whitfield | USA | 46.9 |
| 4 | David Bolen | USA | 47.2 |
| 5 | Morris Curotta | AUS | 47.9 |
| 6 | George Guida | USA | 50.2 |
| Semi-finals | |||
| 7 | George Rhoden | JAM | 47.7 |
| 8 | Jimmy Reardon | IRL | 47.8 |
| 9 | Dennis Shore | RSA | 48.8 |
| 10 | Rosalvo Ramos | BRA | 49.1 |
| 11 | Robert McFarlane | CAN | 51.7 |
| 12 | Rune Larsson | SWE | |
| Quarter-finals | |||
| 13 | Kurt Lundquist | SWE | 48.4 |
| 14 | William Roberts | GBR | 48.6 |
| 15 | Derek Pugh | GBR | 48.8 |
| 16 | Jacques Lunis | FRA | 48.9 |
| 17 | Leslie Lewis | GBR | 49.2 |
| 18 | Zvonko Sabolovic | YUG | 49.5 |
| 19 | Bjorn Vade | NOR | 49.7 |
| 20 | John Bartram | AUS | 49.9 |
| 20 | Francis Schewetta | FRA | 49.9 |
| 22 | Folke Alnevik | SWE | 50.6 |
| 23 | Marko Racic | YUG | 52.1 |
| 24 | Herman Kunnen | BEL | |
| Heats | |||
| 25 | Oskar Hardmeier | SUI | 49.2 |
| 26 | Raymond Crapet | FRA | 49.4 |
| 27 | Don McFarlane | CAN | 49.5 |
| 27 | Gustavo Ehlers | CHI | 49.5 |
| 29 | Ferenc Banhalmi | HUN | 49.6 |
| 30 | Ernest McCullough | CAN | 49.9 |
| 31 | Angel Garcia | CUB | 50.2 |
| 32 | Bill Ramsay | AUS | 50.3 |
| 32 | Walter Keller | SUI | 50.3 |
| 34 | Olavi Talja | FIN | 50.4 |
| 35 | Runar Holmberg | FIN | 50.6 |
| 36 | Antonio Pocovi | ARG | 50.7 |
| 37 | Jaime Aparicio | COL | 50.8 |
| 38 | Chen Yinglang | CHN | 50.9 |
| 38 | Carlos Monges | MEX | 50.9 |
| 38 | Max Trepp | SUI | 50.9 |
| 41 | John de Saram | SRI | 51.2 |
| 42 | Mario Rosas | COL | 51.4 |
| 42 | Reynir Sigurdsson | ISL | 51.4 |
| 44 | Tauno Suvanto | FIN | 51.5 |
| 44 | Kemal Horulu | TUR | 51.5 |
| 44 | Jaime Jitelman | CHI | 51.5 |
| 47 | Guillermo Evans | ARG | 51.8 |
| 48 | Stylianos Stratakos | GRE | 52.8 |
| 49 | Hazzard Dill | BER | 53.0 |
| 49 | Dosan Acarbay | TUR | 53.0 |
| 51 | Georgios Karagiorgos | GRE | 54.5 |
| 51 | Stefanos Petrakis | GRE | 54.5 |
| 53 | L.? Hasso | IRQ | 56.8 |