Athletics at the 1984 Summer Olympics – Men's 100 metres

The event was won by Carl Lewis of the United States, that nation's first title after two Games of missing the podium (4th in 1976, boycotted in 1980).

Defending gold medal winner Allan Wells of Great Britain was the only finalist from the Moscow Games to return.

The American team was strong, led by 1983 World Championship winner Carl Lewis, who was attempting to match Jesse Owens's 1936 quadruple (100, 200, 4x100, and long jump).

[2] Thirteen nations appeared in the event for the first time: Antigua and Barbuda, Bangladesh, the British Virgin Islands, China (in its People's Republic form), Costa Rica, Equatorial Guinea, The Gambia, Mauritius, Oman, Qatar, the Solomon Islands, Swaziland, and the United Arab Emirates.

The event retained the same basic four round format introduced in 1920: heats, quarterfinals, semifinals, and a final.