The Men's 100 metre freestyle competition at the 2019 World Championships was held on 24 and 25 July 2019.

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

The heats were held on 24 July at 10:15.

[3] The semifinals were held on 24 July at 20:26.

[4] The final was held on 25 July at 20:22.