Swimming at the 2001 World Aquatics Championships – Men's 100 metre freestyle

The men's 100 metre freestyle event at the 2001 World Aquatics Championships took place 27 July. The heats and semifinals were held on 26 July.

Records
Prior to the competition, the existing world and championship records were as follows.

The following record was established during the competition: * Split from the men's 4 × 100 m freestyle relay