The Watchers Out of Time and Others is a collection of stories by August Derleth inspired in part by notes left by H. P. Lovecraft after his death and presented as a "posthumous collaboration" between the two writers. (Derleth acted as Lovecraft's literary executor.) Some controversy exists among Lovecraft's admirers as to the ethics of presenting the stories as collaborative works. It was in an edition of 5,070 copies. The book is an omnibus volume of Derleth's posthumous collaborations with Lovecraft. Several of the stories relate to the Cthulhu Mythos and had appeared previously in the earliest collections The Lurker at the Threshold, The Survivor and Others, The Shuttered Room and Other Pieces, The Dark Brotherhood and Other Pieces and other Arkham House publications.