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Date: 4 August 1984 / 5 August 1984 / 8 August 1984
Heats
Quarter-finals
Semi-finals
Final
| Rank | Name | Nation | Time |
| 1 | Alonzo Babers | USA | 44.27 |
| 2 | Gabriel Tiacoh | CIV | 44.54 |
| 3 | Antonio McKay | USA | 44.71 |
| 4 | Darren Clark | AUS | 44.75 |
| 5 | Sunder Nix | USA | 44.75 |
| 6 | Sunday Uti | NGR | 44.93 |
| 7 | Innocent Egbunike | NGR | 45.35 |
| 8 | Bert Cameron | JAM | |
| Semi-finals | |||
| 9 | Bruce Frayne | AUS | 45.21 |
| 10 | Elvis Forde | BAR | 45.32 |
| 11 | Aldo Canti | FRA | 45.59 |
| 12 | Michael Paul | TTO | 45.60 |
| 13 | David Kitur | KEN | 45.62 |
| 14 | Kriss Akabusi | GBR | 45.69 |
| 15 | Susumu Takano | JPN | 45.88 |
| 16 | Dave Lishebo | ZAM | 45.97 |
| Quarter-finals | |||
| 17 | Todd Bennett | GBR | 45.51 |
| 18 | Angel Heras | ESP | 45.66 |
| 19 | John Anzarah | KEN | 45.67 |
| 20 | Antonio Sanchez | ESP | 45.79 |
| 21 | Oddur Sigurdsson | ISL | 46.07 |
| 22 | Marcel Arnold | SUI | 46.10 |
| 23 | Devon Morris | JAM | 46.14 |
| 23 | Allan Ingraham | BAH | 46.14 |
| 25 | Doug Hinds | CAN | 46.19 |
| 26 | Erwin Skamrahl | FRG | 46.39 |
| 27 | David Peltier | BAR | 46.48 |
| 28 | Mark Senior | JAM | 46.50 |
| 29 | Phil Brown | GBR | 46.63 |
| 30 | Gerson Souza | BRA | 46.65 |
| 31 | Isidro Del Prado | PHI | 46.71 |
| 32 | Anton Skerritt | TTO | 46.93 |
| Heats | |||
| 33 | Nafee Mersal | EGY | 46.46 |
| 34 | Mike Okot | UGA | 46.68 |
| 35 | Richard Louis | BAR | 46.70 |
| 36 | Boubacar Diallo | SEN | 46.73 |
| 37 | Moses Kyeswa | UGA | 46.78 |
| 38 | Gary Minihan | AUS | 46.93 |
| 39 | Yann Quentrec | FRA | 46.94 |
| 40 | Tim Bethune | CAN | 46.98 |
| 41 | James Atuti | KEN | 47.04 |
| 42 | Leonardo Loforte | MOZ | 47.07 |
| 43 | Nordin Jadi | MAS | 47.12 |
| 44 | Manuel Ramirez-Caicedo | COL | 47.17 |
| 45 | Jean-Didace Bemou | CGO | 47.26 |
| 46 | Alfred Browne | ANT | 47.29 |
| 47 | Hector Llatser | FRA | 47.30 |
| 48 | Dean Greenaway | IVB | 47.33 |
| 49 | Bryan Saunders | CAN | 47.40 |
| 50 | Adje-Adjeoda Vignon | TOG | 47.43 |
| 51 | Wilson David Santos | BRA | 47.55 |
| 51 | Evaldo Rosa Silva | BRA | 47.55 |
| 53 | Lapule Tamean | PNG | 47.60 |
| 54 | Mohammed Almaliki | OMA | 47.61 |
| 55 | Samuel Sarkpa | LBR | 47.65 |
| 56 | Tommy Johansson | SWE | 47.77 |
| 57 | Ibrahim Okash Omar | SOM | 47.91 |
| 58 | Phillip Pipersburg | BIZ | 48.04 |
| 59 | Joseph Ramotshabi | BOT | 48.11 |
| 60 | Mark Handelsman | ISR | 48.17 |
| 61 | Dawda Jallow | GAM | 48.36 |
| 62 | Chris Madzokere | ZIM | 48.49 |
| 63 | Rashed Jerbeh | UAE | 48.71 |
| 63 | Rene Lopez Escobar | ESA | 48.71 |
| 65 | Arsene Randriamahazoman | MAD | 48.86 |
| 66 | Mama Moluh | CMR | 48.90 |
| 67 | Joseph Rodan | FIJ | 49.00 |
| 68 | Daniel Andre | MRI | 49.09 |
| 69 | Agripa Mwausegha | MAW | 49.12 |
| 70 | Meesaq Rizvi | PAK | 49.58 |
| 71 | Issaka Hassane | CHA | 49.64 |
| 72 | Siegfried Cruden | SUR | 50.07 |
| 73 | Charles Mows | GHA | 50.39 |
| 74 | Faustin Butera | RWA | 51.41 |
| 75 | Pushpa Raj Ojha | NEP | 52.12 |
| 76 | Alberto Lopez-Davila | GUA | 52.21 |
| Did not finish | |||
| Ali St. Louis | TTO | ||
| El Kashief Hassan | SUD | ||
| Disqualified | |||
| Secundino Borabota | GEQ | ||
| Vincent Confait | SEY | ||