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

The men's 100 metre breaststroke event at the 2001 World Aquatics Championships took place 24 July. The heats and semifinals took place 23 July, with the final being held on 24 July.

Records
Prior to the competition, the existing world and championship records were as follows: The following record was established during the competition: