John Young Thomson Greig (1891–1963) was a British literary scholar and award-winning biographer. He was born in Manchuria where his father was a Presbyterian missionary. He served in the First World War as an officer in the Northumberland Fusiliers. After the war, he studied at the University of Glasgow, receiving his MA in 1913, and a DLitt in 1924. Till 1931 he was on the staff of Armstrong College in Newcastle-upon-Tyne. In 1932, he moved to the University of Witwatersrand in South Africa where he succeeded Professor Max Drennan as chair of the English Department.