None but Lucifer is a fantasy novel written by Horace L. Gold and L. Sprague de Camp. It was first published in the fantasy magazine Unknown in September 1939. Despite its good reception by the readership and the prominence of its authors (Gold was the founding editor of Galaxy Science Fiction magazine, and de Camp quickly became a leading light of science fiction and fantasy during those genres' "golden age"), the book remained unpublished in book form for over sixty years, until finally issued as a trade paperback by Gateways Retro Science Fiction in 2002. It is also available as an electronic publication.