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Date: 4 August 1948 / 5 August 1948 / 6 August 1948
Heats
Semi-finals
Final
| Rank | Name | Nation | Time |
| 1 | Allen Stack | USA | 1:06.4 |
| 2 | Robert Cowell | USA | 1:06.5 |
| 3 | Georges Vallerey | FRA | 1:07.8 |
| 4 | Mario Chaves | ARG | 1:09.0 |
| 4 | Clemente Mejia | MEX | 1:09.0 |
| 6 | Johannes Wild | RSA | 1:09.1 |
| 7 | John Brockway | GBR | 1:09.2 |
| 8 | Albert Kinnear | GBR | 1:09.6 |
| Semi-finals | |||
| 9 | Paulo da Fonseca y Silva | BRA | 1:09.8 |
| 10 | Howard Patterson | USA | 1:09.9 |
| 11 | Helio Silva | BRA | 1:10.1 |
| 12 | Bruce Bourke | AUS | 1:11.2 |
| 13 | Cornelius Kievit | NED | 1:11.3 |
| 14 | Lucien Zins | FRA | 1:11.5 |
| 15 | Ilo da Fonseca | BRA | 1:11.6 |
| 16 | Rene Pirolley | FRA | 1:12.9 |
| Heats | |||
| 17 | Thomas Summers | GBR | 1:11.2 |
| 18 | Gyula Valent | HUN | 1:11.8 |
| 18 | Federico Neumayer | ARG | 1:11.8 |
| 20 | Manuel Alua Simas | POR | 1:12.8 |
| 21 | Jiri Kovar | TCH | 1:12.9 |
| 22 | Peter Mingie | CAN | 1:13.2 |
| 23 | Fritz Zwazl | AUT | 1:13.5 |
| 24 | Jose Vegazzi | ARG | 1:13.8 |
| 25 | Francisco Calamita | ESP | 1:14.2 |
| 26 | Eric Jubb | CAN | 1:14.3 |
| 27 | Per-Olof Olsson | SWE | 1:14.6 |
| 28 | Manuel Guerra | ESP | 1:14.8 |
| 29 | Carlos Noreiga | URU | 1:15.0 |
| 30 | Martin Lunden | SWE | 1:15.6 |
| 30 | Tonatiuh Gutierrez | MEX | 1:15.6 |
| 32 | Donald Shanks | BER | 1:17.1 |
| 33 | Hans Blumer | SUI | 1:18.5 |
| 34 | Dorri El-Said | EGY | 1:19.0 |
| 35 | Gudmundur Ingolfsson | ISL | 1:19.4 |
| 36 | Khamlillal Shah | IND | 1:19.9 |
| 37 | Nikolaos Melanofidis | GRE | 1:22.0 |
| 38 | Prahtip Mitra | IND | 1:24.5 |
| 39 | Jaffar Ali Shah | PAK | 1:30.2 |