Lovecraft's Book is a historical novel by American author Richard A. Lupoff.

The original 160,000-word manuscript was lost, but a carbon-copy was found in 2000 and the full original novel was published unabridged as Marblehead: A Novel of H. P. Lovecraft (2006).

The story concerns an offer made to the unworldly fantasist and ghost-writer H. P. Lovecraft by the canny fascist sympathizer, George Sylvester Viereck.

Lovecraft is hired to write a political tract in the nature of an American Mein Kampf.

In return, Viereck promises to arrange for the publication of a volume of Lovecraft's stories.