John Dunning is an American writer of non-fiction and detective fiction. He is known for his reference books on old-time radio and his series of mysteries featuring Denver bookseller and ex-policeman Cliff Laneway.
In 1970 he left the newspaper where he was working, The Denver Post, and took up writing novels, while pursuing a variety of jobs. Partly because of trouble with his publishers, in 1984 he stopped writing and opened a store specializing in second-hand and rare books called the Old Algonquin Bookstore. At the urging of fellow authors, he returned to the world of novels in 1992 with his first Cliff Laneway novel, Booked to Die.