John Dickson Carr, American author and playwright (d. 1977)
John Dickson Carr (November 30, 1906 – February 27, 1977) was an American author of detective stories, who also published using the pseudonyms Carter Dickson, Carr Dickson, and Roger Fairbairn.

He lived in England for a number of years, and is often grouped among "British-style" mystery writers. Most (though not all) of his novels had English settings, especially country villages and estates, and English characters. His two best-known fictional detectives (Dr. Gideon Fell and Sir Henry Merrivale) were both English.

Carr is generally regarded as one of the greatest writers of so-called "Golden Age" mysteries; complex, plot-driven stories in which the puzzle is paramount. He was influenced in this regard by the works of Gaston Leroux and by the Father Brown stories of G. K. Chesterton. He was a master of the so-called locked room mystery, in which a detective solves apparently impossible crimes. The Dr. Fell mystery The Hollow Man (1935), usually considered Carr's masterpiece, was selected in 1981 as the best locked-room mystery of all time by a panel of 17 mystery authors and reviewers. He also wrote a number of historical mysteries.

The son of Wooda Nicholas Carr, a U.S. congressman from Pennsylvania, Carr graduated from The Hill School in Pottstown in 1925 and Haverford College in 1929. During the early 1930s, he moved to England, where he married Clarice Cleaves, an Englishwoman. He began his mystery-writing career there, returning to the United States as an internationally known author in 1948.

In 1950, his biography of Sir Arthur Conan Doyle earned Carr the first of his two Special Edgar Awards from the Mystery Writers of America; the second was awarded in 1970, in recognition of his 40-year career as a mystery writer. He was also presented the MWA's Grand Master award in 1963. Carr was one of only two Americans ever admitted to the British Detection Club.

In early spring 1963, while living in Mamaroneck, New York, Carr suffered a stroke, which paralyzed his left side. He continued to write using one hand, and for several years contributed a regular column of mystery and detective book reviews, "The Jury Box", to Ellery Queen's Mystery Magazine. Carr eventually relocated to Greenville, South Carolina, and died there of lung cancer on February 28, 1977.