V-Day is a global activist movement to end violence against women and girls started by author, playwright and activist Eve Ensler. V-Day began on February 14, 1998, when the very first V-Day benefit performance of Ensler's play The Vagina Monologues took place in NYC, raising over $250k for local anti-violence groups. V-Day was formed and became a 501(c)(3) organization with a mission to raise funds and awareness to end violence against all women and girls (cisgender, transgender, and those who hold fluid identities that are subject to gender based violence). Through V-Day, activists stage royalty free, benefit performances of The Vagina Monologues "to fund local programs, support safe houses, rape crisis centers, and domestic violence shelters, change laws to protect women and girls, and educate local communities to raise awareness and change social attitudes toward violence against women" during the month February, with most of the benefit productions taking place on or about February 14. Ensler has been quoted as saying that it was women's reactions to the play that inspired her and her colleagues to launch V-Day. The 'V' in V-Day stands for Victory, Valentine and Vagina.

Since it launched, thousands of V-Day events have taken place and raised “over 100 million dollars for anti-violence programs across the globe and staged events in more than 200 countries.” V-Day helped launch and supports the City of Joy in Congo – “a transformational leadership community for women survivors of violence in the Democratic Republic of Congo, which is owned and run by local Congolese—as well as One Billion Rising, the biggest annual mass action to end violence against women in history."