The Women's 50 metre butterfly competition at the 2019 World Championships was held on 26 and 27 July 2019.

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

The heats were held on 26 July at 11:11.

[3] The swim-off was held on 26 July at 12:02.

[4] The semifinals were held on 26 July at 21:09.