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- For other uses, see John.
- See Watson for other articles with titles that contain, either by relationship or by coincidence, this character's surname.
In the literature of Sherlock Holmes written by Sir Arthur Conan Doyle, John H. Watson was a fictional character, a then-modern 19th century Human man who lived in London, England on the planet Earth. (TNG episodes: "Elementary, Dear Data", "Ship in a Bottle")