The Man in the High Castle is an alternate history novel by American writer Philip K. Dick. Published and set in 1962, the novel takes place fifteen years after an alternative ending to World War II, and concerns intrigues between the victorious Axis Powers—primarily, Imperial Japan and Nazi Germany—as they rule over the former United States, as well as daily life under the resulting totalitarian rule. The Man in the High Castle won the Hugo Award for Best Novel in 1963. Beginning in 2015, the book was adapted as a multi-season TV series, with Dick's daughter, Isa Dick Hackett, serving as one of the show's producers.

Reported inspirations include Ward Moore's alternate Civil War history, Bring the Jubilee (1953), various classic World War II histories, and the I Ching (referred to in the novel). The novel features a "novel within the novel" comprising an alternate history within this alternate history wherein the Allies defeat the Axis (though in a manner distinct from the actual historical outcome).