The Book of Eibon may refer to:
- Book of Eibon/Manga: The version that appears in the manga. It is a powerful Demon Book of Magic with a unique world within it and contains knowledge collected by it's creator, Eibon.
- Book of Eibon/Anime: The version that appears in the anime. It is a book in which contains knowledge collected by the Sorcerer, Eibon.
The Book of Eibon is based off a similar spellbook with the same name from H. P. Lovecraft's Cthulhu mythos. This version of the Book of Eibon was written by Eibon, a character who first appeared in Clark Ashton Smith's Hyperborea stories and referenced repeatedly in Lovecraft's own stories. Smith and Lovecraft's Book of Eibon chronicles Eibon's life and includes his magical formula.