Galligan is a surname. Notable people with this surname include:
Claire Galligan, American freestyle swimmer Danielle Galligan (born 1992), Irish actress and theatre maker Devin Galligan (died 2003), founder of the charitable organization "Strain the Brain" John Galligan (1865–1937), American baseball player Mike Galligan (born 1968), Irish sportsperson Paul Galligan (1888–1966), Irish politician Pete Galligan (1860–1917), American politician and baseball player Rory Galligan (1973–2012), Irish rally car driver Roseanne Galligan (born 1987), Irish athlete Shane Galligan, American drag queen and musician, stage name Thorgy Thor Tom Galligan (college president) (born 1955), American lawyer, legal scholar, administrator and educator Tom Galligan (mayor) (born 1946), mayor of Jeffersonville, Indiana, US Walter T. Galligan (1925–2010), American Air Force lieutenant general Yvonne Galligan, Irish political scientist and consultant Zach Galligan (born 1964), American actor, Gremlins
See also Galga Galgan