•
John A. Hartigan (born 1937), Australian-American statistician •
John Patrick Hartigan (1887–1968), American jurist • John Hartigan, American captain of
1911 Boston College football team •
John Hartigan (rowing) (1940–2020), American coxswain •
John Hartigan (media executive) (born 1947), Australian journalist •
John C. Hartigan, American Emmy nominee in 2014
Primetime Emmy Award for Outstanding Special Visual Effects • John Hartigan, Australian director of Land Registry, subordinate in 2001 to
Elizabeth O'Keeffe • John Hartigan, English Labour Party candidate in Shipston ward of
2017 Warwickshire County Council election ==Characters==