The Men's 50 metre breaststroke competition of the 2018 FINA World Swimming Championships (25 m) was held on 15 and 16 December 2018 at the Hangzhou Olympic Sports Center.

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

The following new records were set during this competition: The heats were started at 11:31.

[2] The semifinals were held at 20:01.

[3] The final was held at 19:21.