Famous Fantastic Mysteries was an American science fiction and fantasy pulp magazine published from 1939 to 1953. The editor was Mary Gnaedinger. It was launched by the Munsey Company as a way to reprint the many science fiction and fantasy stories which had appeared over the preceding decades in the Munsey magazines, such as Argosy. The first issue was dated September/October 1939; the magazine was immediately successful, and less than a year later a companion magazine, Fantastic Novels, was launched.
Frequently reprinted authors included George Allan England, A. Merritt, and Austin Hall; the artwork was also a major reason for the success of the magazine, with artists such as Virgil Finlay and Lawrence Stevens contributing some of their best work. In late 1942 Popular Publications acquired the title from Munsey, and Famous Fantastic Mysteries stopped reprinting short stories from the earlier magazines. It continued to reprint longer works, including titles by G. K. Chesterton, H. G. Wells, and H. Rider Haggard. Original short fiction also began to appear, including Arthur C. Clarke's "Guardian Angel", which would later form the first section of his novel Childhood's End. In 1951 the publishers experimented briefly with a large digest format, but returned quickly to the original pulp layout. The magazine ceased publication in 1953, almost at the end of the pulp era.
By the early decades of the 20th century, science fiction (sf) stories were frequently seen in popular magazines. The Munsey Company, a major pulp magazine publisher, printed a great deal of science fiction in these years, but it was not until 1926 that Amazing Stories, the first pulp magazine specializing in science fiction appeared. Munsey continued to print sf in Argosy during the 1930s, including stories such as Murray Leinster's The War of the Purple Gas and Arthur Leo Zagat's "Tomorrow", though they owned no magazines that specialized in science fiction. By the end of the 1930s science fiction was a growing market, with several new sf magazines launched in 1939. That year Munsey took advantage of science fiction's growing popularity by launching Famous Fantastic Mysteries as a vehicle for reprinting the most popular fantasy and sf stories from the Munsey magazines.