Mark Haddon (born 26 September 1962) is an English novelist, best known for The Curious Incident of the Dog in the Night-Time (2003). He won the Whitbread Award, the Dolly Gray Children's Literature Award, the Guardian Prize, and a Commonwealth Writers Prize for his work.

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In 2003, Haddon won the Whitbread Book of the Year Award—in the Novels rather than Children's Books category—for The Curious Incident of the Dog in the Night-Time. He also won the Commonwealth Writers Prize in the Best First Book category, as The Curious Incident was considered his first book written for adults;^[1] he also won the Guardian Children's Fiction Prize, a once-in-a-lifetime award judged by a panel of children's writers.^[2] The book was furthermore long-listed for the 2003 Man Booker Prize.^[3]

The Curious Incident is written from the perspective of an autistic 15-year-old boy, Christopher John Francis Boone. In an interview at Powells.com, Haddon claimed that this was the first book that he wrote intentionally for an adult audience; he was surprised when his publisher suggested marketing it to both adult and child audiences (it has been very successful with adults and children alike).^[1]

His short story "The Pier Falls" was longlisted for the 2015 Sunday Times EFG Private Bank Short Story Award, the richest prize in the world for a single short story.^[4]

Haddon is a vegetarian. He describes himself as a "hard-line atheist".^[5][6]

Haddon lives in Oxford with his wife Sos Eltis, a Fellow of Brasenose College, Oxford, and their two sons.^[5]

• Gilbert's Gobstopper (1987)
• Toni and the Tomato Soup (1988)
• A Narrow Escape for Princess Sharon (1989)
• Agent Z Meets the Masked Crusader (1993)
• Titch Johnson, Almost World Champion (1993)
• Agent Z Goes Wild (1994)
  • At Home
  • At Playgroup
  • In the Garden
  • On Holiday
• Gridzbi Spudvetch! (1992)
• The Real Porky Philips (1994)
• Agent Z and the Penguin from Mars (1995)
• The Sea of Tranquility (1996)
• Secret Agent Handbook
• Agent Z and the Killer Bananas (2001)
• Ocean Star Express (2001)
• The Ice Bear's Cave (2002)
• The Curious Incident of the Dog in the Night-Time (2003)
• Boom! (An improved version of Gridzbi Spudvetch) (2009)