Swimming at the 2013 World Aquatics Championships – Men's 100 metre freestyle

The men's 100 metre freestyle event in swimming at the 2013 World Aquatics Championships took place on 31 July and 1 August at the Palau Sant Jordi in Barcelona, Spain.

Records
Prior to this competition, the existing world and championship records were:

Heats
The heats were held at 10:13.

Semifinals
The semifinals were held at 18:02.

Final
The final was held at 18:33.