THE THING ON THE DOORSTEP is a Cthulhu Mythos story, written in 1933 and first published in the January 1937 issue of Weird Tales.

The story is narrated by Daniel Upton, who confesses to murdering his lifelong friend, Edward Derby—but insists it was not truly Derby he killed. As Upton recounts the strange events leading up to the crime, he describes Derby’s marriage to the mysterious Asenath Waite, a woman from the coastal town of Innsmouth with disturbing ties to the occult and the Esoteric Order of Dagon.