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Date: 23 November 1956 / 24 November 1956
Heats
Semi-finals
Final
| Rank | Name | Nation | Time |
| 1 | Glenn Davis | USA | 50.1 |
| 2 | Eddie Southern | USA | 50.8 |
| 3 | Josh Culbreath | USA | 51.6 |
| 4 | Yury Lituyev | URS | 51.7 |
| 5 | David Lean | AUS | 51.8 |
| 6 | Gerhardus Potgieter | RSA | 56.0 |
| Semi-finals | |||
| 7 | Guy Cury | FRA | 51.5 |
| 8 | Anatoly Yulin | URS | 51.7 |
| 9 | Ilie Savel | ROU | 52.0 |
| 10 | Ross Parker | AUS | 52.6 |
| 11 | Harry Kane | GBR | 52.7 |
| 12 | Ioannis Kambadellis | GRE | 53.8 |
| Heats | |||
| 13 | Jaime Aparicio | COL | 52.0 |
| 14 | Ossi Mildh | FIN | 52.1 |
| 15 | Geoffrey Goodacre | AUS | 52.5 |
| 15 | Robert Shaw | GBR | 52.5 |
| 17 | Thomas Farrell | GBR | 52.7 |
| 18 | Alexandre Yankoff | FRA | 53.1 |
| 18 | Muhamad Yaqub | PAK | 53.1 |
| 20 | Keiji Ogushi | JPN | 53.2 |
| 21 | Ulysses dos Santos | BRA | 53.8 |
| 22 | Ovidio de Jesus | PUR | 54.0 |
| 22 | Marcel Lambrechts | BEL | 54.0 |
| 24 | Amadeo Francis | PUR | 54.3 |
| 25 | Pablo Somblingo | PHI | 54.5 |
| 26 | Tsai Cheng-Fu | TPE | 54.6 |
| 27 | Kalim Khawaja | PAK | 55.1 |
| 28 | Jagdev Singh | IND | 55.2 |