Poltergeist III is a 1988 American supernatural horror film co-written and directed by Gary Sherman, and starring Tom Skerritt, Nancy Allen, Heather O'Rourke and Zelda Rubinstein with the latter two reprising their roles from the previous films. The third and final entry in the original Poltergeist film series, it follows young Carol Anne Freeling, who is terrorized by malicious spirits while staying in her aunt and uncle's apartment at Chicago's John Hancock Center.

Released on June 10, 1988, the film marked O'Rourke's final performance, as she died four months before its release at the age of 12. Her death resulted in marketing complications for the film's studio, Metro-Goldwyn-Mayer, who did not want to exploit the tragedy. The film earned negative reviews from critics and disappointed at the box office, earning $14.1 million against a $9.5 million budget.