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

The men's 100 metre backstroke competition of the 2018 FINA World Swimming Championships (25 m) was held on 11 and 12 December 2018.

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

Heats
The heats were started on 11 December at 10:52.

Semifinals
The semifinals were started on 11 December at 19:17.

Final
The final was held on 12 December at 19:08.