Unaussprechlichen Kulten (the name was supposed to mean "nameless cults" in German, but really translates as "unpronounceable cults") is a fictitious book, said to be written by Friedrich von Junzt. It is also sometimes called "The Black Book".

The first mention of the book occurs in Robert E. Howard's story "The Children of the Night" as Nameless cults. H. P. Lovecraft then tried to find a German name for it, and August Derleth finally came up with Unaussprechlichen Kulten, although the German is slightly wrong. Like the Necronomicon, it is mentioned in several stories from Lovecraft's Cthulhu Mythos line. (The correct German, for the curious, would be "Die Namelose Kulten.")


Unaussprechlichen Kulten is also a death metal band ([1]).