The Men's 50 metre breaststroke competition at the 2017 World Championships was held on 25 and 26 July 2017.

[1][2] Prior to the competition, the existing world and championship records were as follows.

The following new records were set during this competition.

[3] The semifinals were held on 25 July at 18:11.

[4] The final was held on 26 July at 18:17.