Isaac Asimov's Magical Worlds of Fantasy is a series of twelve themed paperback fantasy and science fiction anthologies edited by Isaac Asimov, Martin H. Greenberg and Charles G. Waugh, a companion set to the ten volume Isaac Asimov's Wonderful Worlds of Science Fiction, produced by the same editors. It was published by Signet/New American Library from 1983 to 1991. Volumes 1 and 2 were also issued in hardcover in an omnibus collection titled Isaac Asimov's Magical Worlds of Fantasy: Witches & Wizards.
Each volume in the series featured stories devoted to a different fantastic theme, as indicated in the individual volume titles. Most volumes also included an introduction by Asimov.