The Women's Equality Party (WEP) is a feminist political party set up in the United Kingdom in 2015. The idea was conceived by Catherine Mayer and Sandi Toksvig at the Women of the World Festival, when they concluded that there was a need for a party to campaign for gender equality to the benefit of all. The launch meeting was on 28 March 2015 under the title "The Women's Equality Party needs you. But probably not as much as you need the Women's Equality Party". The party's full policy was launched by its then-leader Sophie Walker at Conway Hall on 20 October 2015. In January 2020, Mandu Reid took over as party leader.

Catherine Mayer is an American-born British author and journalist, and the co-founder and President of the Women's Equality Party (WE) in the UK.