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Date: 3 August 1984 / 4 August 1984 / 5 August 1984
Heats
Semi-finals
Final
| Rank | Name | Nation | Time |
| 1 | Edwin Moses | USA | 47.75 |
| 2 | Danny Harris | USA | 48.13 |
| 3 | Harald Schmid | FRG | 48.19 |
| 4 | Sven Nylander | SWE | 48.97 |
| 5 | Amadou Dia Ba | SEN | 49.28 |
| 6 | Tranel Hawkins | USA | 49.42 |
| 7 | Michel Zimmermann | BEL | 50.69 |
| 8 | Henry Amike | NGR | 53.78 |
| Semi-finals | |||
| 9 | Karl Smith | JAM | 49.58 |
| 10 | Simon Kitur | KEN | 49.80 |
| 11 | Franz Meier | SUI | 49.89 |
| 12 | Ryoichi Yoshida | JPN | 49.92 |
| 13 | Rik Tommelein | BEL | 50.06 |
| 14 | Uwe Schmitt | FRG | 50.08 |
| 15 | Greg Rolle | BAH | 50.16 |
| 16 | Antonio Ferreira | BRA | 50.70 |
| Heats | |||
| 17 | Shigenori Omori | JPN | 50.14 |
| 18 | Thomas Futterknecht | AUT | 50.25 |
| 19 | Rene Meledje Djedjemel | CIV | 50.27 |
| 20 | George Vamvakas | GRE | 50.39 |
| 21 | Ken Gray | JAM | 50.46 |
| 22 | Thomas Nyberg | SWE | 50.47 |
| 23 | Peter Rwamuhanda | UGA | 50.55 |
| 24 | Ahmed Hamada | BRN | 50.62 |
| 25 | Martin Briggs | GBR | 50.80 |
| 26 | Gerard Brunel | FRA | 50.99 |
| 27 | Lloyd Guss | CAN | 51.02 |
| 28 | Ahmed Abdel Chalim Ghanem | EGY | 51.08 |
| 29 | Ian Newhouse | CAN | 51.14 |
| 30 | Athanassios Kalogiannis | GRE | 51.27 |
| 30 | Phil Beattie | GBR | 51.27 |
| 30 | Christer Gullstrand | SWE | 51.27 |
| 33 | Franck Jonot | FRA | 51.39 |
| 34 | Oswaldo Zea | VEN | 51.44 |
| 35 | Jasem Al-Duaillah Jamaan | KUW | 51.45 |
| 36 | Pierre Leveille | CAN | 51.47 |
| 37 | Meshak Munyoro | KEN | 51.99 |
| 38 | Martin Gillingham | GBR | 52.15 |
| 39 | Jean Pierre Abossolo Ze | CMR | 52.85 |
| 40 | Vincent Confait | SEY | 53.62 |
| 41 | Faustin Butera | RWA | 54.36 |
| 42 | Domingos Mendes | MOZ | 54.52 |
| 43 | Khamis Ebrahim | UAE | 55.50 |
| 44 | Nicolas Chaparro | PAR | 56.98 |
| Did not finish | |||
| Jose Alonso | ESP | ||
| Did not start | |||
| Alphonse Mandonda | CGO | ||