Janet Leigh (born Jeanette Helen Morrison; July 6, 1927 – October 3, 2004) was an American actress, singer, dancer, and author. Raised in Stockton, California by working-class parents, Leigh was discovered at age eighteen by actress Norma Shearer, who helped her secure a contract with Metro-Goldwyn-Mayer. Leigh had her first formal foray into acting appearing in radio programs before making her film debut in The Romance of Rosy Ridge (1947).

Early in her career, she appeared in several popular films for MGM which spanned a wide variety of genres, including Act of Violence (1948), Little Women (1949), Angels in the Outfield (1951), Scaramouche (1952), The Naked Spur (1953), and Living It Up (1954). Leigh played mostly dramatic roles during the latter half of the 1950s, in such films as Safari (1956) and Orson Welles's film noir Touch of Evil (1958), but achieved her most lasting recognition as the doomed Marion Crane in Alfred Hitchcock's Psycho (1960), which earned her a Golden Globe Award for Best Supporting Actress and an Academy Award nomination for Best Supporting Actress.

Her highly publicized marriage to actor Tony Curtis ended in divorce in 1962, and after starring in The Manchurian Candidate that same year, Leigh scaled back her career. Intermittently, she continued to appear in films, including Bye Bye Birdie (1963), Harper (1966), Night of the Lepus (1972), and Boardwalk (1979). In late 1975, she made her Broadway debut in a production of Murder Among Friends. She would also go on to appear in two horror films with her daughter, Jamie Lee Curtis: The Fog (1980) and Halloween H20: 20 Years Later (1998).

In addition to her work as an actress, Leigh also wrote four books between 1984 and 2002, two of which were novels. She died in October 2004 at age 77, following a year-long battle with vasculitis, an inflammation of the blood vessels.