John Henry Sexton OBE (2 July 1863 – 3 November 1954) was a Baptist minister in South Australia.
He grew up in Mount Barker and studied for the Baptist ministry at Union College, was ordained in 1885, and served as minister to Baptist churches in Georgetown, Gumeracha, Morphett Vale and Gawler.
He was actively involved with Adelaide City Mission for over 25 years and its president in 1926.
He was a member of the State Advisory Council for Aborigines from 1918 to 1940 and on occasion served as secretary.
In 1935 he served as a member of a board called by the Commonwealth to investigate the treatment of Aborigines at Hermannsburg Mission and the killing of Yokunnunna, an unarmed Aboriginal man, at Ayers Rock (now Uluru) by Constable W.