For Sherlock Holmes' assistant, please see John H. Watson.

Watson was a Starfleet engineer serving on board the USS Enterprise under Lieutenant Commander Montgomery Scott during the late 2260s.

Watson gave Dohlman Elaan and her guards a tour of the Enterprise's engineering section during their visit in 2268. Watson was later performing his engineering rounds when he discovered Kryton attempting to blow up the warp drive; Kryton killed him by breaking his neck. (TOS: "Elaan of Troyius")