John Gratton Wilson (18 August 1863 – 20 August 1948) was an Australian politician. Born in Melbourne, he was educated at Wesley College and the University of London before becoming a doctor and farmer near Warrnambool. In 1902, he was elected to the Victorian Legislative Assembly for the seat of Villiers and Heytesbury, but in 1903 he transferred to federal politics, winning the Australian House of Representatives seat of Corangamite as a member of the Free Trade Party.