"Cat Ballou" is a Western comedy film released in 1965, directed by Elliot Silverstein and starring Jane Fonda in the title role. The film is based on a novel by Roy Chanslor.

The story follows Catherine "Cat" Ballou, a young woman who returns home to Wyoming to find that her father's ranch is in danger of being taken over by a ruthless railroad baron named Sir Harry Percival. Cat enlists the help of a group of misfit outlaws, including a drunken gunslinger named Kid Shelleen (also played by Lee Marvin), to fight against Percival and his men.

The film is known for its unique blend of comedy and Western genre conventions, as well as its memorable performances. Marvin won an Academy Award for Best Actor in a Leading Role for his dual portrayal of Kid Shelleen and his evil twin brother, Tim Strawn.

"Cat Ballou" was a critical and commercial success upon its release, and has since become a beloved classic of the Western genre. It is notable for its use of humor to subvert and comment on the traditional tropes of the Western genre, and for its strong female lead character, who is both independent and resourceful.