2018 FINA World Swimming Championships (25 m) – Men's 100 metre individual medley

The men's 100 metre individual medley competition of the 2018 FINA World Swimming Championships (25 m) was held on 13 and 14 December 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 13 December at 9:30.

Semifinals
The semifinals were started on 13 December at 19:14.

Final
The final was held on 14 December at 19:13.