Xero was a fanzine edited and published by Dick Lupoff, Pat Lupoff and Bhob Stewart from 1960 to 1963, winning a Hugo Award in the latter year. With science fiction and comic books as the core subjects, Xero also featured essays, satire, articles, poetry, artwork and cartoons on a wide range of other topics, material later collected into two hardcover books.

Richard Allen Lupoff was an American science-fiction and mystery author, who also wrote humor, satire, nonfiction and reviews. In addition to his two dozen novels and more than 40 short stories, he also edited science-fantasy anthologies. He was an expert on the writing of Edgar Rice Burroughs, and had an equally strong interest in H. P. Lovecraft. He also co-edited the non-fiction anthology All in Color For a Dime, which has been described as "the very first published volume dedicated to comic book criticism"; as well as its sequel, The Comic-Book Book.