John Alexander Gunn (11 February 1860 – 21 September 1910) was an Australian pioneer scientist and politician.
He was born at Buninyong in Victoria to farmer Donald Gunn and Jane Surman.
Donald migrated to Australia from Brawlbin, Caithness, Scotland in 1854 and married Jane Surman in 1859 at Buninyong.
Australian born, of Scotch extraction, a successful manager of stations in various districts in New South Wales, he had devoted his leisure to a scientific investigation of Anthrax and had invented and patented a vaccine named after him - the Gunn vaccine ...
He was a thorough-going individualist, objecting altogether to Government regulation and the necessity of taking out a licence for his experimental work - a fine fellow for all that - hard working and upright, with that interesting combination of speculative intelligence and a keen commercial instinct ... For the rest he was a materialist in metaphysic, a reactionary in politics, and an autocrat in the home.