This article is about the women's 100 metre butterfly event in swimming, at the 2013 World Aquatics Championships.

The event took place on 28–29 July at the Palau Sant Jordi in Barcelona, Spain.

[1][2] Prior to this competition, the existing world and championship records were: The heats were held at 10:00.

[7] The semifinals were held at 18:02.

[8] The final was held at 18:10.