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 Munsey magazines such as Argosy. From its first issue, dated September/October 1939, Famous Fantastic Mysteries was an immediate success. Less than a year later, a companion magazine, Fantastic Novels, was launched.