Wicked is a Tony Award-winning Broadway and West End musical, with songs and lyrics by Stephen Schwartz and book by Winnie Holzman. The story is based on the best-selling novel Wicked: The Life and Times of the Wicked Witch of the West by Gregory Maguire, a parallel novel of L. Frank Baum's classic story The Wonderful Wizard of Oz from the perspective of the witches of the Land of Oz.

Wicked tells the story of Elphaba, the future Wicked Witch of the West and her relationship with Galinda, later Glinda, the Good Witch of the North. Their friendship struggles through their opposing personalities and viewpoints, rivalry over the same love-interest, their reactions to the Wizard's corrupt government, and, ultimately, Elphaba's public fall from grace. The plot of the first act is set before Dorothy's arrival from Kansas, and includes several references to well-known scenes and dialogue in the 1939 film The Wizard of Oz as a backstory.

Wicked the musical premiered at San Francisco's Curran Theatre in May 2003. In October, 2003, the show moved to Broadway's Gershwin Theatre. It was produced by Universal Pictures and directed by Joe Mantello, with musical staging by Wayne Cilento. Its original stars were Idina Menzel as Elphaba, Kristin Chenoweth as Glinda, and Joel Grey as the Wizard. Although the production received mixed reviews and was panned by The New York Times, it has proved to be a favorite among patrons. The Broadway production's success spawned productions in Chicago, Los Angeles, London's West End, Tokyo, Melbourne, Sydney, Stuttgart, and San Francisco, as well as two North American tours that have visited over 30 cities in Canada and the United States.

Wicked has broken box office records around the world, holding weekly-gross-takings records in New York, Los Angeles, Chicago, St. Louis, and London, and the record for biggest opening in the West End (£100,000 in the first hour on sale). Both the West End production and the North American tour have been seen by over two million patrons. The show was nominated for ten 2004 Tony Awards, winning those for Best Actress (Menzel), Scenic Design and Costume Design. It also won six Drama Desk Awards.