Halligan is a surname of Irish origin, deriving from Irish Ó hAilechain or Ó hAleagain. Bearers include:
Bob Halligan, Jr., US Christian rock musicianBrendan Halligan, Irish economist and politicianBrian Halligan, CEO of HubSpotCaitlin Halligan, US lawyer and judicial nomineeDanny Halligan, New Zealand soccer playerDaryl Halligan, New Zealand rugby league playerDick Halligan, US jazz-rock musicianJames Halligan (1778–1806), an Irishman hanged for murder in AmericaJames Reginald Halligan (1894–1968), Australian public servantJim Halligan, US politicianJocko Halligan, US baseball playerJohn Halligan (ice hockey), US ice hockey executiveJohn Halligan, Jr., US Navy admiralJohnny Halligan, Scottish footballerLiam Halligan, UK economist and journalistMarion Halligan, Australian writerRay Halligan, Australian politicianUrsula Halligan, Irish broadcaster