12 Great Classics of Science Fiction is an anthology of science fiction short stories edited by Groff Conklin. It was first published in paperback by Gold Medal Books in December 1963 and reprinted by Fawcett Gold Medal in May 1966, February 1970, and 1973.The book collects twelve novelettes and short stories by various science fiction authors, together with an introduction by the editor. The stories were previously published from 1953-1963 in various science fiction and other magazines.