Athletics at the 1984 Summer Olympics – Men's 400 metres
The Men's 400 metres at the 1984 Summer Olympics in Los Angeles, California had an entry list of 76 competitors, with ten qualifying heats, four quarterfinals and two semi-finals, before the final took off.Medalists
Abbreviations
Records
These were the standing world and Olympic records prior to the 1984 Summer Olympics.
| World Record | 43.86 |  Lee Evans | Mexico City | October 18, 1968 |
| Olympic Record | 43.86 | Lee Evans | Mexico City | October 18, 1968 |
Results
Final
| Rank | Athlete | Nation | Time | Notes |
| Alonzo Babers | | 44.27 PB | - |
| Gabriel Tiacoh | | 44.54 | - |
| Antonio McKay | | 44.71 | - |
| 4 | Darren Clark | | 44.75 | - |
| 5 | Sunder Nix | | 44.75 | - |
| 6 | Sunday Uti | | 44.93 | - |
| 7 | Innocent Egbunike | | 45.35 | - |
| Bertland Cameron | | DNS | - |
Semifinals
| Rank | Athlete | Nation | Time | Notes |
| 1 | Gabriel Tiacoh | | 44.64 | - |
| 2 | Sunday Uti | | 44.83 | - |
| 3 | Antonio McKay | | 44.92 | - |
| 4 | Bertland Cameron | | 45.10 | - |
| 5 | Bruce Frayne | | 45.21 | - |
| 6 | Elvis Forde | | 45.32 | - |
| 7 | David Kitur | | 45.62 | - |
| 8 | Dave Lishebo | | 45.97. | - |
Quarterfinals
| Rank | Athlete | Nation | Time | Notes |
| 1 | Innocent Egbunike | | 45.26 | - |
| 2 | Sunder Nix | | 45.31 | - |
| 3 | Elvis Forde | | 45.60 | - |
| 4 | Aldo Canti | | 45.64 | - |
| 5 | Angel Heras | | 45.88 | - |
| 6 | Marcel Arnold | | 46.10 | - |
| 7 | Philip Brown | | 46.63 | - |
| 8 | Anton Skerritt | | 46.93. | - |
| Rank | Athlete | Nation | Time | Notes |
| 1 | Alonzo Babers | | 44.75 PB | - |
| 2 | Sunday Uti | | 45.01 | - |
| 3 | Bertland Cameron | | 45.16 | - |
| 4 | Bruce Frayne | | 45.35 | - |
| 5 | Todd Bennett | | 45.51 | - |
| 6 | Antonio Sánchez | | 45.79 | - |
| 7 | Oddur Sigurdsson | | 46.07 | - |
| 8 | Doug Hinds | | 46.19. | - |
| Rank | Athlete | Nation | Time | Notes |
| 1 | Gabriel Tiacoh | | 45.15 | - |
| 2 | David Kitur | | 45.78 | - |
| 3 | Michael Paul | | 45.84 | - |
| 4 | Susumu Takano | | 45.91 | - |
| 5 | Erwin Skamrahl | | 46.39 | - |
| 6 | Mark Senior | | 46.50 | - |
| 7 | Gerson Souza | | 46.65 | - |
| 8 | Isidro del Prado | | 46.71. | - |
Preliminary Heats
| Rank | Athlete | Nation | Time | Notes |
| 1 | Davison Lishebo | | 46.20 | - |
| 2 | David Peltier | | 46.57 | - |
| 3 | Allan Ingraham | | 46.72 | - |
| 4 | Boubacar Diallo | | 46.73 | - |
| 5 | Dean Greenaway | | 47.33 | - |
| 6 | Evaldo da Silva | | 47.55 | - |
| 7 | Ibrahim Okash | | 47.91 | - |
| 8 | Issaka Hassane | | 49.64 | - |
| Rank | Athlete | Nation | Time | Notes |
| 1 | Gabriel Tiacoh | | 45.96 | - |
| 2 | David Kitur | | 46.25 | - |
| 3 | Marcel Arnold | | 46.46 | - |
| 4 | Gary Minihan | | 46.93 | - |
| 5 | Nordin Jadi | | 47.12 | - |
| 6 | Tommy Johansson | | 47.77 | - |
| 7 | Daniel Andre | | 49.09 | - |
| 8 | Faustin Butéra | | 51.41. | - |
| Rank | Athlete | Nation | Time | Notes |
| 1 | Innocent Egbunike | | 46.63 | - |
| 2 | Mark Senior | | 46.73 | - |
| 3 | Gérson de Souza | | 47.02 | - |
| 4 | Manuel Ramirez-Caicedo | | 47.17 | - |
| 5 | Brian Saunders | | 47.40 | - |
| 6 | Mohamed Amer Al-Malky | | 47.61 | - |
| 7 | Meesaq Rizvi | | 49.58. | - |
| 8 | Secundino Borabota | | DQ | - |
| Rank | Athlete | Nation | Time | Notes |
| 1 | Bertland Cameron | | 46.14 | - |
| 2 | Oddur Sigurdsson | | 46.30 | - |
| 3 | Doug Hinds | | 46.42 | - |
| 4 | Richard Louis | | 46.70 | - |
| 5 | Jean-Didiace Bémou | | 47.26 | - |
| 6 | Hector Llatser | | 47.30 | - |
| 7 | Phillip Pipersburg | | 48.04 | - |
| 8 | Alberto López | | 52.21. | - |
| Rank | Athlete | Nation | Time | Notes |
| 1 | Alonzo Babers | | 45.81 | - |
| 2 | Michael Paul | | 46.18 | - |
| 3 | Philip Brown | | 46.26 | - |
| 4 | Moses Kyeswa | | 46.78 | - |
| 5 | Tim Bethune | | 46.98 | - |
| 6 | Joseph Ramotshabi | | 48.11 | - |
| 7 | Dawda Jallow | | 48.36 | - |
| 8 | René López | | 48.71. | - |
| Rank | Athlete | Nation | Time | Notes |
| 1 | Bruce Frayne | | 46.08 | - |
| 2 | Aldo Canti | | 46.14 | - |
| 3 | Susumu Takano | | 46.26 | - |
| 4 | Nafi Mersal | | 46.46 | - |
| 5 | Alfred Browne | | 47.29 | - |
| 6 | Rashid Al-Jirbi | | 48.71 | - |
| 7 | Siegfried Cruden | | 50.07. | - |
| 8 | Hassan El-Kashief | | DNF | - |
| Rank | Athlete | Nation | Time | Notes |
| 1 | Sunder Nix | | 45.42 | - |
| 2 | Elvis Forde | | 45.47 | - |
| 3 | Antonio Sánchez | | 46.03 | - |
| 4 | Anton Skerritt | | 46.30 | - |
| 5 | James Atuti | | 47.04 | - |
| 6 | Adjé Adjeoda Vignon | | 47.43 | - |
| 7 | Lapule Tamean | | 47.60 | - |
| 8 | Pushpa Raj Ojha | | 52.12. | - |
| Rank | Athlete | Nation | Time | Notes |
| 1 | Antonio McKay | | 45.55 | - |
| 2 | John Anzarah | | 46.12 | - |
| 3 | Isidro del Prado | | 46.82 | - |
| 4 | Leonardo Loforte | | 47.07 | - |
| 5 | Joseph Rodan | | 49.00 | - |
| 6 | Agripa Mwausegha | | 49.12 | - |
| 7 | Charles Moses | | 50.39. | - |
| 8 | Ali St. Louis | | DNF | - |
| Rank | Athlete | Nation | Time | Notes |
| 1 | Erwin Skamrahl | | 45.94 | - |
| 2 | Angel Heras | | 46.06 | - |
| 3 | Todd Bennett | | 46.09 | - |
| 4 | Yann Quentrec | | 46.94 | - |
| 5 | Wilson dos Santos | | 47.55 | - |
| 6 | Mark Handelsman | | 48.17 | - |
| 7 | Chris Madzokere | | 48.49 | - |
| 8 | Arsène Randriamahazomana | | 48.86. | - |
| Rank | Athlete | Nation | Time | Notes |
| 1 | Kriss Akabusi | | 45.64 | - |
| 2 | Darren Clark | | 45.68 | - |
| 3 | Sunday Uti | | 45.74 | - |
| 4 | Devon Morris | | 45.80 | - |
| 5 | Mike Okot | | 46.68 | - |
| 6 | Samuel Sarkpa | | 47.65 | - |
| 7 | Mama Moluh | | 48.90. | - |
| 8 | Vincent Confait | | DQ | - |
In the UK TV show Little Britain, character Denver Mills is credited as having won the silver medal in the 400 metres at the 1984 Olympics.
