The Women's 100 metre freestyle competition at the 2017 World Championships was held on 27 and 28 July 2017.

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

During the competition, prior to this 100 metre event, on 23 July 2017, Sarah Sjöström set a new world record in the 4 × 100 metre freestyle relay final; her mark was at 51.71.

[3] The swim-off was held on 27 July at 10:58.

[5] The final was held on 28 July at 17:32.