The men's 100 metres at the 1983 IAAF World Championships was held at the Olympic Stadium in Helsinki, Finland on 7 and 8 August 1983. 67 athletes from 49 nations entered to the competition
Existing records at the start of the event.
The qualifying heats took place on 7 August, with the 67 athletes involved being split into 9 heats. The first 3 athletes in each heat ( <span style="border: 1px solid #a2a9b1;padding: 0.1em 0.4em; background-color: #ccffcc">Q</span> ) and the next 5 fastest ( <span style="border: 1px solid #a2a9b1;padding: 0.1em 0.4em; background-color: #ddffdd">q</span> ) qualified for the quarter-finals.
The quarter-finals took place on 7 August, with the 32 athletes involved being split into 4 heats. The first 4 athletes in each heat ( <span style="border: 1px solid #a2a9b1;padding: 0.1em 0.4em; background-color: #ccffcc">Q</span> ) qualified for the semifinals.
The semi-finals took place on 8 August, with the 16 athletes involved being split into 2 heats. The first 4 athletes in each heat ( <span style="border: 1px solid #a2a9b1;padding: 0.1em 0.4em; background-color: #ccffcc">Q</span> ) qualified for the final.
The final took place on August 8.