Klute is a 1971 American neo-noir psychological thriller film directed and produced by Alan J. Pakula and starring Jane Fonda, Donald Sutherland, Charles Cioffi, Nathan George, Dorothy Tristan, Roy Scheider and Rita Gam. Its plot follows a high-priced New York City call girl who assists a detective from Pennsylvania in solving the missing person case of a john who may be stalking her. It is the first installment of what has informally come to be known as Pakula's "paranoia trilogy", followed by The Parallax View (1974) and All the President's Men (1976), all films dealing with themes of paranoia, conspiracies and surveillance.

The original screenplay for Klute was written by brothers Andy and Dave Lewis, with Andy drawing inspiration from a serial he read as a child about a man attempting to solve his brother's murder in a city. Principal photography took place in late 1970 and early 1971 in New York City.

Klute was released theatrically in the United States on June 23, 1971, by Warner Bros. to critical and commercial success. Reviewers praised the film's direction and screenplay, with Fonda's performance receiving widespread critical acclaim, while the film grossed over $12 million against a $2.5 million budget.

Klute received two nominations at the 44th Academy Awards, including Best Original Screenplay, with Fonda winning Best Actress. At the 25th British Academy Film Awards, Fonda received a nomination for Best Actress in a Leading Role. At the 29th Golden Globe Awards, it received a nomination for Best Screenplay, with Fonda winning Best Actress in a Motion Picture – Drama.