John or Jack Gilligan may refer to:
John Gilligan (criminal) (born 1952), Irish criminal John J. Gilligan (1921–2013), Governor of Ohio John Gilligan (footballer, born 1957), footballer for Swindon Town and Sligo John Gilligan (footballer, born 1884) (1884–1946), 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. (1923–1942), United States Marine Jack Gilligan (baseball) (1885–1980), Major League Baseball pitcher