- Watson, Thomas Augustus Watson - United States telephone engineer who assisted Alexander Graham Bell in his experiments (1854-1934)
--1 is a kind of engineer, applied scientist, technologist
- Watson, John Broadus Watson - United States psychologist considered the founder of behavioristic psychology (1878-1958)
--2 is a kind of psychologist
- Watson, James Watson, James Dewey Watson - United States geneticist who (with Crick in 1953) helped discover the helical structure of DNA (born in 1928)
--3 is a kind of geneticist