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Date: 29 July 1948 / 30 July 1948 / 31 July 1948
Heats
Semi-finals
Final
| Rank | Name | Nation | Time |
| 1 | Walter Ris | USA | 57.3 |
| 2 | Alan Ford | USA | 57.8 |
| 3 | Geza Kadas | HUN | 58.1 |
| 4 | Keith Carter | USA | 58.3 |
| 5 | Alexandre Jany | FRA | 58.3 |
| 6 | Per-Olof Olsson | SWE | 59.3 |
| 7 | Zoltan Szilard | HUN | 59.6 |
| 8 | Taha El-Gamal | EGY | 1:00.5 |
| Semi-finals | |||
| 9 | Bruce Bourke | AUS | 1:00.0 |
| 10 | Alberto Isaac | MEX | 1:00.1 |
| 11 | Martin Lunden | SWE | 1:00.2 |
| 12 | Horatio White | ARG | 1:00.4 |
| 13 | Elemer Szathmary | HUN | 1:00.5 |
| 14 | Aram Boghossian | BRA | 1:01.0 |
| 14 | Ronald Stedman | GBR | 1:01.0 |
| 16 | Warren Boyd | AUS | 1:01.1 |
| Heats | |||
| 17 | Manuel Guerra | ESP | 1:00.7 |
| 18 | Olle Johansson | SWE | 1:01.0 |
| 18 | Peter Salmon | CAN | 1:01.0 |
| 20 | Jesus Dominguez | ESP | 1:01.3 |
| 21 | Henri Padou | FRA | 1:01.5 |
| 22 | Sergio Rodrigues | BRA | 1:01.6 |
| 22 | Ari Guðmundsson | ISL | 1:01.6 |
| 24 | Augusto Canton | ARG | 1:01.8 |
| 25 | Nicasio Silverio | CUB | 1:02.0 |
| 26 | Patrick Kendall | GBR | 1:02.1 |
| 27 | Trevor Harrop | GBR | 1:02.3 |
| 28 | Ali Bagdadi | EGY | 1:02.4 |
| 29 | Dorri El-Said | EGY | 1:02.5 |
| 29 | Raul Garcia | CUB | 1:02.5 |
| 31 | Eric Jubb | CAN | 1:02.8 |
| 32 | Go Choan-Yick | CHN | 1:03.5 |
| 33 | Plauto Guimaraes | BRA | 1:03.7 |
| 34 | Sachindra Nag | IND | 1:03.8 |
| 35 | Isidoro Perez | ESP | 1:04.0 |
| 36 | Fernand Martinaux | FRA | 1:04.2 |
| 37 | Walter Schneider | SUI | 1:05.1 |
| 38 | Isaac Monsoor | IND | 1:06.4 |
| 39 | Dilip Mitra | IND | 1:06.9 |
| 40 | Panagiotis Hadjikyriakakis | GRE | 1:07.4 |
| 41 | Derek Oatway | BER | 1:08.6 |