Sherlock Holmes () is a fictional detective created by British author Arthur Conan Doyle. Referring to himself as a "consulting detective" in his stories, Holmes is known for his proficiency with observation, deduction, forensic science and logical reasoning that borders on the fantastic, which he employs when investigating cases for a wide variety of clients, including Scotland Yard.

The character Sherlock Holmes first appeared in print in 1887's A Study in Scarlet. His popularity became widespread with the first series of short stories in The Strand Magazine, beginning with "A Scandal in Bohemia" in 1891; additional tales appeared from then until 1927, eventually totalling four novels and 56 short stories. All but one are set in the Victorian or Edwardian eras between 1880 and 1914. Most are narrated by the character of Holmes's friend and biographer, Dr. John H. Watson, who usually accompanies Holmes during his investigations and often shares quarters with him at the address of 221B Baker Street, London, where many of the stories begin.

Though not the first fictional detective, Sherlock Holmes is arguably the best known. By the 1990s, over 25,000 stage adaptations, films, television productions, and publications had featured the detective, and Guinness World Records lists him as the most portrayed human literary character in film and television history. Holmes's popularity and fame are such that many have believed him to be not a fictional character but an actual person; many literary and fan societies have been founded on this pretence. Avid readers of the Holmes stories helped create the modern practice of fandom, with the Sherlock Holmes fandom being one of the first cohesive fan communities in the world. The character and stories have had a profound and lasting effect on mystery writing and popular culture as a whole, with the original tales, as well as thousands written by authors other than Conan Doyle, being adapted into stage and radio plays, television, films, video games, and other media for over one hundred years.

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