John or Jack Gilligan may refer to:
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John Gilligan (criminal) (born 1952), Irish criminal
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John J. Gilligan (1921–2013), Governor of Ohio
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John Gilligan (footballer, born 1957), footballer for Swindon Town and Sligo
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John Gilligan (footballer, born 1884) (1884–1946), Scottish footballer for Clyde
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John Gilligan (mayor), independent councilor and former mayor of Limerick, 2008–2009
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John Gilligan (hurler), Irish hurler
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John Joseph Gilligan Jr. (1923–1942), United States Marine
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Jack Gilligan (baseball) (1885–1980), Major League Baseball pitcher
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