| Final | time | | | 1. Carl Lewis |  United States | 9.99s | | | 2. Sam Graddy | United States | 10.19s | | | 3. Ben Johnson |  Canada | 10.22s | | | 4. Ron Brown | United States | 10.26s | | | 5. Mike McFarlane |  Great Britain | 10.27s | | | 6. Ray Stewart |  Jamaica | 10.29s | | | 7. Donovan Reid | Great Britain | 10.33s | | | 8. Tony Sharpe | Canada | 10.35s | |
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| | | Venue: Los Angeles Memorial Coliseum 100,000. 84 competitors from -- nations. |
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| World Record: 9.93s Calvin Smith, United States Colorado Springs, United States July 3, 1983 | | Olympic Record: 9.95s Jim Hines, United States Mexico City, Mexico October 14, 1968 |
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| | | First 4 from each Semi advanced to Final. |
| Semi 1 | time | | | 1. Ray Stewart | Jamaica | 10.26s | Q | | 2. Sam Graddy | United States | 10.27s | Q | | 3. Donovan Reid | Great Britain | 10.32s | Q | | 4. Ron Brown | United States | 10.34s | Q | | 5. Desai Williams | Canada | 10.34s | | | 6. Christian Haas |  West Germany | 10.41s | | | 7. Marc Gasparoni |  France | 10.49s | | | 8. Mohamed Purnomo |  Indonesia | 10.51s | |
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| Semi 2 | time | | | 1. Carl Lewis | United States | 10.14s | Q | | 2. Ben Johnson | Canada | 10.42s | Q | | 3. Mike McFarlane | Great Britain | 10.45s | Q | | 4. Tony Sharpe | Canada | 10.52s | Q | | 5. Luis Morales |  Puerto Rico | 10.54s | | | 6. Stefano Tilli |  Italy | 10.55s | | | 7. Norman Edwards | Jamaica | 10.63s | | | 8. Allan Wells | Great Britain | 10.71s | |
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| Quarter 1 | time | | | 1. Ben Johnson | Canada | 10.41s | Q | | 2. Donovan Reid | Great Britain | 10.47s | Q | | 3. Christian Haas | West Germany | 10.51s | Q | | 4. Hasely Crawford |  Trinidad Tobago | 10.56s | | | 5. Antonio Ullo | Italy | 10.57s | | | 6. Bruno Marie-Rose | France | 10.60s | | | 7. Paul Narracott |  Australia | 10.60s | | | 8. Alfonso Pitters |  Panama | 10.63s | |
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| Quarter 2 | time | | | 1. Sam Graddy | United States | 10.15s | Q | | 2. Tony Sharpe | Canada | 10.33s | Q | | 3. Norman Edwards | Jamaica | 10.44s | Q | | 4. Nelson dos Santos |  Brazil | 10.53s | | | 5. Charles-Louis Seck |  Senegal | 10.54s | | | 6. Yu Zhuanghui |  China | 10.59s | | | 7. Neville Hodge |  US Virgin Islands | 10.69s | | | -. Ronald Desruelles |  Belgium | DNS | |
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| Quarter 3 | time | | | 1. Stefano Tilli | Italy | 10.39s | Q | | 2. Ron Brown | United States | 10.40s | Q | | 3. Marc Gasparoni | France | 10.56s | Q | | 4. Sumet Promna |  Thailand | 10.61s | | | 5. Katsuhiko Nakaya | Brazil | 10.69s | | | 6. Hiroki Fuwa |  Japan | 10.75s | | | 7. Philip Attipoe |  Ghana | 10.78s | | | 8. Kouadio Otokpa |  Ivory Coast | 10.80s | |
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| Quarter 4 | time | | | 1. Ray Stewart | Jamaica | 10.30s | Q | | 2. Allan Wells | Great Britain | 10.33s | Q | | 3. Mohamed Purnomo | Indonesia | 10.43s | Q | | 4. José Javier Arqués |  Spain | 10.52s | | | 4. Peter Van Miltenburg | Australia | 10.52s | | | 6. Antoine Richard | France | 10.53s | | | 7. Paulo Roberto Correia | Brazil | 10.54s | | | 8. Audrick Lightbourne |  Bahamas | 10.59s | |
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| Quarter 5 | time | | | 1. Carl Lewis | United States | 10.04s | Q | | 2. Desai Williams | Canada | 10.27s | Q | | 3. Luis Morales | Puerto Rico | 10.35s | Q | | 4. Mike McFarlane | Great Britain | 10.36s | q | | 5. Chidi Imoh |  Nigeria | 10.42s | | | 6. Dudley Parker | Bahamas | 10.58s | | | 7. Fred Martin | Australia | 10.61s | | | 8. Evers Jürgen | West Germany | 10.69s | |
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| Heat 1 | time | | | 1. Carl Lewis | United States | 10.32s | Q | | 2. Tony Sharpe | Canada | 10.38s | Q | | 3. Mike McFarlane | Great Britain | 10.47s | Q | | 4. Hasely Crawford | Trinidad Tobago | 10.48s | q | | 5. Peter Van Miltenburg | Australia | 10.55s | q | | 6. Vicente Daniel |  Mozambique | 10.81s | | | 7. Henry Ngolwe |  Zambia | 10.94s | | | 8. Paul Réneau |  Belize | 10.96s | |
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| Heat 2 | time | | | 1. Allan Wells | Great Britain | 10.32s | Q | | 2. Mohamed Purnomo | Indonesia | 10.40s | Q | | 3. José Javier Arqués | Spain | 10.42s | Q | | 4. Marc Gasparoni | France | 10.47s | q | | 5. Emilio Samayoa |  Guatemala | 10.84s | | | 6. Barnabé Messomo |  Cameroon | 10.98s | | | 7. Charles Mbazira |  Uganda | 11.03s | | | 8. Mohamed Abdullah |  United Arab Emirates | 11.11s | |
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| Heat3 | time | | | 1. Desai Williams | Canada | 10.35s | Q | | 2. Chidi Imoh | Nigeria | 10.39s | Q | | 3. Charles-Louis Seck | Senegal | 10.45s | Q | | 4. Christian Nenepath | Indonesia | 10.66s | | | 4. Henri Ndinga |  Congo | 10.66s | | | 6. Abdullah Sulaiman Al-Akbary |  Oman | 10.86s | | | 7. Inoke Bainimoli |  Fiji | 11.15s | | | 8. Daniel André |  Mauritius | 11.19s | |
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| Heat 4 | time | | | 1. Sumet Promna | Thailand | 10.52s | Q | | 2. Paul Narracott | Australia | 10.55s | Q | | 3. Neville Hodge | US Virgin Islands | 10.58s | Q | | 4. Audrick Lightbourne | Bahamas | 10.64s | | | 5. Gus Young | Jamaica | 10.64s | | | 6. Bill Trott |  Bermuda | 10.76s | | | 7. Kgosiemang Khumoyarano |  Botswana | 11.49s | |
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| Heat 5 | time | | | 1. Sam Graddy | United States | 10.29s | Q | | 2. Donovan Reid | Great Britain | 10.41s | Q | | 3. Evers Jürgen | West Germany | 10.54s | Q | | 4. Hiroki Fuwa | Japan | 10.56s | | | 5. Philip Attipoe | Ghana | 10.60s | | | 6. Jean-Yves Mallat |  Lebanon | 10.83s | | | 7. Markus Büchel |  Liechtenstein | 10.98s | | | 8. Clifford Mamba |  Swaziland | 11.24s | |
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| Heat 6 | time | | | 1. Ray Stewart | Jamaica | 10.24s | Q | | 2. Antoine Richard | France | 10.35s | Q | | 3. Antonio Ullo | Italy | 10.36s | Q | | 4. Paulo Roberto Correia | Brazil | 10.45s | q | | 5. Anthony Jones |  Barbados | 10.69s | | | 6. Oliver Daniels |  Liberia | 10.76s | | | 7. Muhammad Mansha |  Pakistan | 10.87s | |
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| Heat 7 | time | | | Heat 7 | time | | | 1. Ben Johnson | Canada | 10.35s | Q | | 2. Yu Zhuanghui |  China | 10.53s | Q | | 3. Bruno Marie-Rose | France | 10.59s | Q | | 4. Earl Haley |  Guyana | 10.74s | | | 5. Julien Thode |  Netherlands Antilles | 10.92s | | | 6. Ronald Russell | US Virgin Islands | 11.02s | | | 7. Denis Rose |  Seychelles | 11.04s | |
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| Heat 8 | time | | | 1. Ronald Desruelles | Belgium | 10.46s | Q | | 2. Stefano Tilli | Italy | 10.48s | Q | | 3. Fred Martin | Australia | 10.64s | Q | | 4. Luís Barroso |  Portugal | 10.76s | | | 5. Gustavo Envela |  Equatorial Guinea | 10.79s | | | 6. Oumar Fye |  Gambia | 10.87s | | | 7. Anthony Henry |  Antigua Barbuda | 10.99s | | | 8. Saidur Rahman Dawn |  Bangladesh | 11.25s | |
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| Heat 9 | time | | | 1. Ron Brown | United States | 10.58s | Q | | 2. Luis Morales | Puerto Rico | 10.60s | Q | | 3. Nelson dos Santos | Brazil | 10.70s | Q | | 4. Ralf Lübke | West Germany | 10.70s | | | 5. Collins Mensah | Ghana | 10.92s | | | 6. Ivan Benjamin |  Sierra Leone | 11.13s | | | 7. Johnson Kere |  Solomon Islands | 11.57s | |
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| Heat 10 | time | | | 1. Norman Edwards | Jamaica | 10.57s | Q | | 2. Dudley Parker | Bahamas | 10.65s | Q | | 3. Kouadio Otokpa | Ivory Coast | 10.72s | Q | | 4. Pierfrancesco Pavoni | Italy | 10.72s | | | 5. Faraj Saad Marzouk |  Qatar | 10.78s | | | 6. Odiya Silweya |  Malawi | 11.22s | | | 7. Glen Abrahams |  Costa Rica | 11.31s | |
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| Heat 11 | time | | | Heat 11 | time | | | 1. Christian Haas | West Germany | 10.41s | Q | | 2. Alfonso Pitters | Panama | 10.50s | Q | | 3. Katsuhiko Nakaya | Brazil | 10.55s | Q | | 4. Bakary Jarjue | Gambia | 10.68s | | | 5. Sim Deok-seop |  South Korea | 10.72s | | | 6. Guy Hill |  British Virgin Islands | 11.11s | | | 7. Aldo Salandra |  El Salvador | 11.31s | |
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