The Women's 100 metre backstroke competition at the 2019 World Championships was held on 22 and 23 July 2019.

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

The heats were held on 22 July at 10:00.

[3] The semifinals were held on 22 July at 20:54.

[4] The final was held on 23 July at 20:51.