Gregory Maguire (born June 9, 1954) is an American novelist. He is the author of Wicked, Confessions of an Ugly Stepsister, and several dozen other novels for adults and children.

Many of Maguire's adult novels are inspired by classic children's stories. Maguire published his first novel, The Lightning Time, in 1978. Wicked, published in 1995, was his first novel for adults.