V, formerly Eve Ensler (/ˈɛnslər/; born May 25, 1953), is an American playwright, author, performer, feminist, and activist. V is best known for her play The Vagina Monologues. In 2006 Charles Isherwood of The New York Times called The Vagina Monologues "probably the most important piece of political theater of the last decade."

In 2011, V was awarded the Isabelle Stevenson Award at the 65th Tony Awards, which recognizes an individual from the theater community who has made a substantial contribution of volunteered time and effort on behalf of humanitarian, social service, or charitable organizations. V was given this award for her creation of the non-profit V-Day movement which raises money and educates the public about violence against women, gender expansive people, and the Earth - and efforts to stop it.

She writes for The Guardian and has been featured in films including V-Day's Until the Violence Stops, the PBS documentary What I Want My Words to Do to You, and the Netflix documentary City of Joy, among others. She regularly appears in print, radio, podcast, and television interviews including on CNN, Democracy Now, TODAY, Real Time with Bill Maher and Russell Simmons Presents Def Poetry.

V was born in New York City, the second of three children of Arthur Ensler, an executive in the food industry, and Chris Ensler. She was raised in the northern suburb of Scarsdale. Her father was Jewish and her mother Christian, and she grew up in a predominantly Jewish community; however, V identifies herself as a Nichiren Buddhist and says that her spiritual practice includes chanting Namu Myōhō Renge Kyō and doing yoga.

V says that from the ages of five to ten, she was sexually and physically abused by her father. Growing up, she has said she was "very sad, very angry, very defiant. I was the girl with the dirty hair. I didn't fit anywhere."

V attended Middlebury College in Vermont, where she became known as a militant feminist. After graduating in 1975, she had a string of abusive relationships and became dependent on drugs and alcohol. In 1978, she married Richard Dylan McDermott, a 34-year-old bartender, who convinced her to enter rehab. She adopted Mark Anthony McDermott, her husband's 16-year-old son from his first marriage. Their relationship came to be a close one, and V said that it taught her "how to be a loving human being". After V suffered a miscarriage, Mark took the name she had planned for her baby, Dylan. V and Dylan's father separated in 1988, the former citing that she "needed the independence, the freedom". According to a 2012 article in the Sydney Morning Herald, "After her marriage ended, she had a long relationship with the artist and psychotherapist Ariel Orr Jordan but is single now, which seems to suit her nomadic lifestyle – she has homes in New York and Paris but travels much of the year."

A June 2010 article by V in The Guardian said that she was receiving treatment for uterine cancer. She wrote about her experience with cancer in her memoir, In The Body of the World. In an interview with Democracy Now! in 2012, V stated that she was two and a half years cancer free.

After publishing her book The Apology in 2019, where she described sexual and physical abuse by her late father, the author stated she wished to distance herself from the surname he used and expressed her preference to be called by the mononym V.