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Date: 30 July 1948 / 31 July 1948
Heats
Semi-finals
Final
| Rank | Name | Nation | Time |
| 1 | Roy Cochran | USA | 51.1 |
| 2 | Duncan White | SRI | 51.8 |
| 3 | Rune Larsson | SWE | 52.2 |
| 4 | Richard Ault | USA | 52.4 |
| 5 | Yves Cros | FRA | 53.3 |
| 6 | Ottavio Missoni | ITA | 54.0 |
| Semi-finals | |||
| 7 | Jean-Claude Arifon | FRA | 52.2 |
| 8 | Jeffery Kirk | USA | 52.5 |
| 9 | Harry Whittle | GBR | 53.4 |
| 10 | Bebbe Storskrubb | FIN | 53.5 |
| 11 | John Holland | NZL | 53.9 |
| 12 | Jacques Andre | FRA | 56.3 |
| Heats | |||
| 13 | Alf Westman | SWE | 54.5 |
| 14 | Hermenegildo Alberti | ARG | 54.6 |
| 15 | William LaRochelle | CAN | 54.9 |
| 16 | Jaime Aparicio | COL | 55.1 |
| 16 | Kemal Horulu | TUR | 55.1 |
| 16 | Ronald Unsworth | GBR | 55.1 |
| 19 | Michael Pope | GBR | 55.3 |
| 20 | Sergio Guzman | CHI | 55.9 |
| 20 | Mario Rosas | COL | 55.9 |
| 22 | Werner Christen | SUI | 56.7 |
| 23 | Ng Liangchian | CHN | 57.7 |
| 24 | Lazaros Petropoulakis | GRE | 57.9 |
| 25 | Mohsin Mirza Khan | PAK | 59.5 |