Gregory Maguire (born June 9, 1954) is an American novelist. He is renowned for his novel Wicked: The Life and Times of the Wicked Witch of the West, which was adapted into a highly successful Broadway musical in 2003. This novel is one of several dozen that Maguire has penned for both adults and children, with many of his works offering a revisionist take on classic children's stories.

His first novel, The Lightning Time, was published in 1978. Wicked, published in 1995, was his first novel aimed at adults. The story of Wicked is a reimagining of the Wicked Witch of the West from L. Frank Baum's The Wonderful Wizard of Oz, transforming her into the sympathetic character Elphaba.

Beyond Wicked, Maguire's works include Confessions of an Ugly Stepsister and Mirror, Mirror, the latter being a retelling of Snow White. His writing often explores themes of identity and morality, inviting readers to view well-known tales from new perspectives.

Gregory Maguire holds a Ph.D. in English and American Literature from Tufts University and a B.A. from the State University of New York at Albany. He was a professor and co-director at the Simmons College Center for the Study of Children's Literature from 1979 to 1985. In 1987, he co-founded the non-profit educational charity, Children's Literature New England.

Maguire is married to American painter Andy Newman, and their marriage was one of the first same-sex marriages in the state of Massachusetts. Together, they have adopted two children, Luke and Alex.