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 novels The Death of Grass, The Possessors, 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.
Except where stated otherwise, all items listed are novels or novellas published as books.
Christopher's novel The Year of the Comet saw its first U.S. publication in the August 1957 issue of Satellite Science Fiction
Christopher's novella "A World of Slaves" was the cover story on the March 1959 issue of Satellite Science Fiction
- The Twenty-Second Century (1954) (short story collection)
- The Year of the Comet (Michael Joseph, 1955); US title, Planet in Peril (Avon, 1959)
- The Death of Grass (Michael Joseph, 1956); US title, No Blade of Grass (Simon & Schuster, 1957)
- The Caves of Night (1958)
- A Scent of White Poppies (1959)
- The Long Voyage (US title The White Voyage, 1960)
- The World in Winter (US title The Long Winter, 1962)
- Cloud on Silver (US title Sweeney's Island, 1964)
- The Possessors (1964)
- A Wrinkle in the Skin (US title The Ragged Edge, 1965)
- The Little People (1966)
- The Tripods trilogy(expanded to tetralogy, 1988)
- The White Mountains (1967) Macmillan (US); Hamish Hamilton(UK)
- The City of Gold and Lead (1967) Macmillan (US); Hamish Hamilton (UK)
- The Pool of Fire (1968) Macmillan (US); Hamish Hamilton (UK)
- When the Tripods Came (prequel) (1988)
- Pendulum (1968)
- The Lotus Caves (1969) Macmillan (US); Hamish Hamilton (UK) ISBN 0-241-01729-7
- The Guardians (1970)
- The Sword of the Spirits trilogy
- In the Beginning Longman (1972) ISBN 0-582-53726-6
- Dom and Va (1973)
- Wild Jack (1974)
- Empty World (1977)
- The Fireball trilogy
- A Dusk of Demons (1993)
- Bad Dream (2003)