John Charles James Sarsfield McCorkill (31 August 1854 – 10 March 1920) was a Canadian lawyer, judge, and politician. Born in Farnham, Quebec, the son of Robert McCorkill and Margaret Meighen, McCorkill was educated in Farnham and Saint-Jean, at the McGill Model School and Normal School, and received a Bachelor of Laws degree from McGill University in 1877. He served in the Fenian Raid of 1870 as a Captain of the 60th Battalion of Missisquoi County. He was called to the Bar of Quebec in 1878 and practiced law in Montreal, Farnham, and Cowansville. He was a major in the 5th Royal Scots while he lived in Montreal retiring in 1887.