John (Jack) William Gordon (19 November 1925 – 20 November 2017) was an English writer of young-adult supernatural fiction. He wrote sixteen fantasy novels including The Giant Under the Snow, four short story collections, over fifty short stories, and a teenage memoir. His short stories have appeared in more than 50 anthologies and other publications and he is included in The Cambridge Guide to Children's Books in English. His work has been translated into many languages, including Russian, Japanese, Italian, Swedish, Danish, Czech, Spanish, Polish and Lithuanian.