Gregory Maguire (born 9 June 1954) is the author of The Wicked Years series of alternate Oz books.
Maguire earned his B.A. from the State University of New York at Albany, and his Ph.D. in English and American Literature from Tufts University. He has been active in promotion of children's literature, with the National Children's Book and Literacy Alliance and other organizations.
Maguire has published a score of works in children's literature, from The Lightning Time (1978) to What-the-Dickens: The Story of a Rogue Tooth Fairy (2007). He has also written fantasy works for adults, which tend to take ironic, satiric, deconstructive approaches to the traditional fantasy literature. The title of his 1999 book Confessions of an Ugly Stepsister shows this orientation. Maguire's reversal of the traditional Oz literature, in which the villainess becomes the heroine, takes a comparable approach.