The Men's 100 metre freestyle competition at the 2017 World Championships was held on 26 and 27 July 2017.

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

The heats were held on 26 July at 09:45.

[3] The semifinals were held on 26 July at 17:41.

[4] The final was held on 27 July at 17:51.