Charles Fort was an American researcher from the early twentieth century who cataloged reports of unexplained phenomena he found in newspapers and science journals. A minor bestseller with a cult appeal, Fort's work was posthumously republished in the pulp science fiction magazine Astounding Stories in 1934. His idiosyncratic books fascinated, scared, and entertained readers, many of them authors and editors of science fiction. Fort's work prophesied the paranormal mainstays of SF literature to come: UFOs, poltergeists, strange disappearances, cryptids, ancient mysteries, unexplained natural phenomena, and everything in between. Science fiction authors latched on to Fort's topics and hypotheses as perfect fodder for SF stories. Writers like Arthur C. Clarke, Philip K. Dick, Robert Heinlein, H.P. Lovecraft, and others are examined in this exploration of Fortean science fiction—a genre that borrows from the reports and ideas of Fort and others who saw the possible science-fictional nature of our reality.