These are the official results of the men's 100 metres event at the 2003 IAAF World Championships in Paris, France.

There were a total number of 79 participating athletes, with ten qualifying heats, four quarter-finals, two semi-finals and the final held on Monday 25 August 2003.

[1][2][3][4] At 18 years, 318 days old, silver medallist Darrel Brown became the youngest ever world medallist for the men's 100 m.[5] The winning margin was 0.01 seconds which as of 2024 remains the joint-narrowest winning margin in the men's 100 metres at these championships.

The other occurrence was in 2015.

Held on Sunday 2003-08-25