Swimming at the 2024 World Aquatics Championships – Men's 100 metre butterfly

The Men's 100 metre butterfly competition at the 2024 World Aquatics Championships was held on 16 and 17 February 2024.

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

Heats
The heats were started on 16 February at 09:31.

Swim-off
The swim-off was started on 16 February at 11:38.

Semifinals
The semifinals were held on 16 February at 19:09.

Final
The final was held on 17 February at 19:42.