Half Moon Street is a 1986 British-American erotic thriller film about an American woman working at a British escort service who becomes involved in the political intrigues surrounding one of her clients. The film was directed by Bob Swaim, and stars Sigourney Weaver, Michael Caine, and Patrick Kavanagh. Half Moon Street was the first RKO Pictures solo feature film produced in almost a quarter-century. The previous one was Jet Pilot, made in 1957. The film was based on the 1984 novel Doctor Slaughter by Paul Theroux.