The men's 50 metre backstroke competition of the 2018 FINA World Swimming Championships (25 m) was held on 13 and 14 December 2018.

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

The heats were started on 13 December at 9:56.

[2] The semifinals were started on 13 December at 20:22.

[3] The final was held on 14 December at 20:30.