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

The Men's 100 metre butterfly competition of the 2024 European Aquatics Championships was held on 19 and 20 June 2024.

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

Heats
The heats were started on 19 June 2024 at 09:48. Qualification Rules: The 16 fastest from the heats qualify to the semifinals.

Swim-off
The swim-off was held on 19 June at 10:47. Qualification Rules: The best time advance to the semifinals.

Semifinals
The semifinals were started on 19 June at 19:04. Qualification Rules: The first 2 competitors of each semifinal and the remaining fastest (up to a total of 8 qualified competitors) from the semifinals advance to the final.

Final
The final was held on 20 June at 18:30.