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Sam Youd (16 April 1922 – 3 February 2012), known professionally as Christopher Samuel Youd, was a British writer, best known for science fiction under the pseudonym John Christopher, including the novel The Death of Grass and the young-adult novel series The Tripods. He won the Guardian Prize in 1971 and the Deutscher Jugendliteraturpreis in 1976.

Youd also wrote under variations of his own name and under the pseudonyms Stanley Winchester, Hilary Ford, William Godfrey, William Vine, Peter Graaf, Peter Nichols, and Anthony Rye.