Porridge (U.S. title: Doing Time) is a 1979 British comedy film directed by Dick Clement and starring Ronnie Barker, Richard Beckinsale, Fulton Mackay and Brian Wilde. It was written by Clement and Ian La Frenais based on their BBC television series Porridge (1974–1977). Most of prison officers and inmates from the original series appear in the film, with the notable exceptions of Lukewarm, Blanco, Heslop, and Harris. There is also a different governor, played by Geoffrey Bayldon rather than series regular Michael Barrington.

The film, set a year before the final episode of the TV series, includes one of the last appearances by Richard Beckinsale, the actor who played Godber. He died in March 1979, a few weeks after its completion.