Swimming at the 2018 Mediterranean Games – Men's 100 metre butterfly

The men's 100 metre butterfly competition at the 2018 Mediterranean Games was held on 23 June 2018 at the Campclar Aquatic Center.

Records
Prior to this competition, the existing world and Mediterranean Games records were as follows:

Heats
The heats were held at 10:03.

Final
The final was held at 18:06.