The Women's 100 metre breaststroke competition at the 2017 World Championships was held on 24 and 25 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.

The heats were held on 24 July at 10:00.

[3] The semifinals were started on 24 July at 17:58.