The 100 metres at the 2007 World Championships in Athletics was held at the Nagai Stadium on August 25 and August 26.

Qualification: First 3 in each heat (Q) and the next 8 fastest (q) advance to the quarterfinals.

First 4 of each Heat directly qualified (Q) for the Semifinals.

First 4 of each Heat directly qualified (Q) for the Final.