The Men's 100 metre butterfly competition of the 2022 FINA World Swimming Championships (25 m) was held on 17 and 18 December 2022.

[1] Prior to the competition, the existing world and championship records were as follows.

The heats were started on 17 December at 12:16.

[2] The semifinals were started on 17 December at 20:22.

[3] The final was held on 18 December at 19:42.