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William Olaf Stapledon (May 10, 1886 – September 6, 1950) was a British philosopher and author of several influential works of science fiction.

Stapledon's writings directly influenced Arthur C. Clarke, Brian Aldiss, Stanislaw Lem, C. S. Lewis and John Maynard Smith and indirectly influenced many others, contributing many ideas to the world of science fiction. The "supermind" composed of many individual consciousnesses forms a recurring theme in his work. Star Maker contains the first known description of what are now called Dyson spheres. Freeman Dyson credits the novel with giving him the idea. Last and First Men features early descriptions of genetic engineering and terraforming. Sirius describes a dog whose intelligence is increased to the level of a human being's.

Stapledon's fiction often presents the strivings of some intelligence that is beaten down by an indifferent universe and its inhabitants who, through no fault of their own, fail to comprehend its lofty yearnings. It is filled with protagonists who are tormented by the conflict between their "higher" and "lower" impulses