The Dark World is a science fantasy novel credited to Henry Kuttner, although his wife C. L. Moore may have been an uncredited collaborator, or possibly even the author.

The protagonist is airman Edward Bond, who discovers that he shares his body with an alternate version of himself, a despotic wizard named Ganelon.

Bond travels through a portal into the fantastical alternate dimension and enters a conflict: the Coven (consisting of a sorceress, a werewolf and an immortal) fight for Ganelon while the white witch Freydis leads a rebellion against him.

Critic Stefan R. Dziemianowicz has suggested that Bond's split personality in the novel is "consistent with CLM's deployment of psychologically conflicted characters in her earlier fiction.

[1] Roger Zelazny said that the Kuttner story that had the greatest impression on him when younger was The Dark World and remarked that much of its appeal comes from its "colorful, semi-mythic characters and strong action."