Swimming at the 2018 European Aquatics Championships – Men's 100 metre butterfly

The Men's 100 metre butterfly competition of the 2018 European Aquatics Championships was held on 8 and 9 August 2018.

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

The following new records were set during this competition.

Heats
The heats were started on 8 August at 09:35.

Semifinals
The semifinals were started on 8 August at 17:17.

Final
The final was started on 9 August at 17:00.