The Mad God's Amulet is a fantasy novel by English writer Michael Moorcock, first published in 1968 as Sorcerer's Amulet. The novel is the second in the four-volume The History of the Runestaff.

Michael John Moorcock is an English–American writer, particularly of science fiction and fantasy, who has published a number of well-received literary novels as well as comic thrillers, graphic novels and non-fiction. He has worked as an editor and is also a successful musician. He is best known for his novels about the character Elric of Melniboné, which were a seminal influence on the field of fantasy in the 1960s and 1970s.