Wicked is a musical with songs and lyrics by Stephen Schwartz and a 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, 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 is set mostly 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.