The Incomplete Enchanter is a collection of two fantasy novellas by American writers L. Sprague de Camp and Fletcher Pratt, the first volume in their Harold Shea series.

[2][1] The Harold Shea stories are parallel world tales in which magic exists in separate universes which coexist with our own, and which can be reached by aligning one's mind to them by a system of symbolic logic.

In the stories collected as The Incomplete Enchanter, the authors' protagonist Harold Shea visits two such worlds, that of Norse mythology and that of Edmund Spenser's The Faerie Queene.

"[4] P. Schuyler Miller declared that these "first and best of the Harold Shea stories," through the authors' "fiendishly clever application of symbolic logic", have "annexed the entire realm of "pure" fantasy to science fiction.

"[7] The book was also reviewed by E. J. Carnell in Operation Fantast, #6, September 1950; the editor in Thrilling Wonder Stories, October 1950; P. Schuyler Miller in Other Worlds Science Stories, January 1951; Joseph H. Crawford, Jr., James J. Donahue and Donald M. Grant in '333': A Bibliography of the Science-Fantasy Novel, 1953; John Carnell in Science Fantasy, August 1962; Joseph Nicholas in Paperback Parlour, December 1979; Everett F. Bleiler in The Guide to Supernatural Fiction, 1983; and Bill Fawcett and Jody Lynn Nye in Galaxy's Edge Magazine, Issue 19, March 2016.