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This article is on the astronomer John Bolton. For other people named "John Bolton," see John Bolton (disambiguation).

John Gatenby Bolton FRS (5 June 1922 – 6 July 1993) was a British-Australian astronomer from Sheffield, England. He attended King Edward VII School (Sheffield), followed by Trinity College, Cambridge from 1940 to 1942, during which time he met C. P. Snow. After graduation he joined the navy, serving on HMS Unicorn during World War II. His ship went to Australia; he remained there after the war. In September 1946 he began working at the CSIRO Division of Radiophysics. At that time the field of radio astronomy was quite new and Bolton took the opportunity to become a pioneer in the field with experimentation at Dover Heights. His group found a number of radio sources in the sky, and realized that certain "radio stars" were actually located outside our galaxy and worked on mapping the structure of our galaxy.