Freaky Friday is a 1976 American fantasy-comedy film directed by Gary Nelson, with the screenplay written by Mary Rodgers based on her 1972 novel of the same name. The film stars Barbara Harris and Jodie Foster in the lead roles. John Astin, Patsy Kelly and Dick Van Patten are featured in supporting roles. In the film, a mother and her daughter switch their bodies, and they get a taste of each other's lives. The cause of the switch is left unexplained in this film, but occurs on Friday the 13th, when Ellen and Annabel, in different places, say about each other at the same time, "I wish I could switch places with her for just one day." Rodgers added a water skiing subplot to her screenplay.

Freaky Friday was released theatrically in the United States on January 21, 1977, by Buena Vista Distribution. The film received positive reviews from critics with praise for Foster and Harris's performances and was a box office success, grossing $36 million on a $5 million budget. At the 34th Golden Globe Awards, it received three nominations: Best Actress – Comedy or Musical (for both Foster and Harris), and Best Original Song ("I'd Like to Be You for a Day"). The success of the film's release led to the launch of a franchise.