An American magazine with 82 issues edited by Mary Gnaedinger from September/October 1939 until its demise in June 1953 as shown below.
A reprint magazine leaning towards fantasy until sold to Popular Publications during the March 1943 issue when original material was used in short story format. Changing to full length novels during August 1940.
Fantastic artwork by Lawrence Sterne Stevens and Virgil Finley
Super Science Stories in Canada was a reprint of Famous Fantastic Mysteries.
A further reprinting under the name of Famous Fantastic Mysteries took place in Canada between February 1948 and August 1952