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 was called to the Bar of Quebec in 1878 and practiced law in Montreal, Farnham, and Cowansville.

He unsuccessfully ran for the Legislative Assembly of Quebec for the electoral district of Missisquoi in the 1886 election and in an 1888 by-election.

He resigned in 1903 when he was appointed Treasurer in the cabinets of Simon-Napoléon Parent and Lomer Gouin.