John Abernethy may refer to: John Abernethy (bishop of Caithness), Scottish bishop, died 1639 John Abernethy (judge) (born 1947), Australian judge John Abernethy (minister) (1680–1740), Presbyterian minister in Ireland John Abernethy (surgeon) (1764–1831), English surgeon and grandson of the above, and originator of the Abernethy biscuit Jack Abernathy (1876–1941), United States Marshall See also Abernethy (surname)