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

The men's 100 meter backstroke event at the 2001 World Aquatics Championships took place 23 July. The heats and semifinals took place 22 July, with the final being held on 23 July.

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