John Gilligan
John or Jack Gilligan may refer to:
- John Gilligan (criminal), Irish criminal
- John J. Gilligan, Governor of Ohio
- John Gilligan (footballer, born 1957), footballer for Swindon Town and Sligo
- John Gilligan (footballer, born 1884), Scottish footballer for Clyde
- John Gilligan (mayor), independent councilor and former mayor of Limerick, 2008–2009
- John Gilligan (hurler), Irish hurler and footballer
- John Joseph Gilligan Jr., United States Marine
- Jack Gilligan (baseball), Major League Baseball pitcher