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Date: 23 September 1988 / 24 September 1988 / 25 September 1988
Heats
Semi-finals
Final
| Rank | Name | Nation | Time |
| 1 | Andre Phillips | USA | 47.19 |
| 2 | Amadou Dia Ba | SEN | 47.23 |
| 3 | Edwin Moses | USA | 47.56 |
| 4 | Kevin Young | USA | 47.94 |
| 5 | Winthrop Graham | JAM | 48.04 |
| 6 | Kriss Akabusi | GBR | 48.69 |
| 7 | Harald Schmid | FRG | 48.76 |
| 8 | Edgar Itt | FRG | 48.78 |
| Semi-finals | |||
| 9 | Toma Tomov | BUL | 48.90 |
| 10 | Joseph Maritim | KEN | 49.50 |
| 11 | Jose Alonso | ESP | 49.57 |
| 12 | Simon Kitur | KEN | 49.74 |
| 13 | Alain Cuypers | BEL | 49.75 |
| 14 | Klaus Ehrle | AUT | 51.04 |
| 15 | John Graham | CAN | 51.33 |
| 16 | Gideon Yego | KEN | |
| Heats | |||
| 17 | Jozef Kucej | TCH | 49.89 |
| 18 | Ahmed Abdel Chalim Ghanem | EGY | 50.44 |
| 19 | Ryoichi Yoshida | JPN | 50.49 |
| 20 | Hwang Hong-Chul | KOR | 50.52 |
| 21 | Leigh Miller | AUS | 50.53 |
| 22 | Rok Kopitar | YUG | 50.54 |
| 23 | Hamadou Mbaye | SEN | 50.58 |
| 24 | Max Robertson | GBR | 50.67 |
| 25 | Phil Harries | GBR | 50.81 |
| 26 | Samuel Matete | ZAM | 51.06 |
| 27 | Domingo Cordero | PUR | 51.26 |
| 28 | Branislav Karaulic | YUG | 51.32 |
| 29 | Ahmed Hamada | BRN | 51.34 |
| 30 | Benjamin Grant | SLE | 51.73 |
| 31 | Jasem Al-Duaillah Jamaan | KUW | 51.87 |
| 32 | Allan Ince | BAR | 52.76 |
| 33 | Oral Selkridge | ANT | 53.44 |
| 34 | Yousif Al-Dosari | KSA | 53.51 |
| 35 | Joseph Rodan | FIJ | 53.66 |
| 36 | Jorge Fidel Ponce | HON | 55.38 |
| 37 | Damber Kunwar | NEP | 56.80 |
| Did not start | |||
| Sven Nylander | SWE | ||