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Heather Michele O'Rourke (December 27, 1975 – February 1, 1988) was an American child actress. She had her breakthrough starring as Carol Anne Freeling in the supernatural horror film Poltergeist (1982), which received critical acclaim and established her as an influential figure in the genre. She went on to reprise the role in Poltergeist II: The Other Side (1986) and Poltergeist III (1988), the last of which was released posthumously.
O'Rourke also worked in television, appearing in the recurring roles of Heather Pfister on the comedy series Happy Days (1982–1983) and Melanie in the sitcom Webster (1983), as well as starring as Sarah Brogan in the television-film Surviving: A Family in Crisis (1985).
Throughout her career, O'Rourke was nominated for six Young Artist Awards, winning once for her role in Webster. On February 1, 1988, O'Rourke died following two cardiac arrests, her cause of death later being ruled as congenital stenosis of the intestine complicated by septic shock.