John Abernethy

John Abernethy may refer to:
 * John Abernethy (bishop) (c. 1570–1639), Scottish bishop
 * 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 marshal