Turtle Diary is a 1985 British film directed by John Irvin and starring Glenda Jackson, Ben Kingsley, and Michael Gambon.

Based on a screenplay adapted by Harold Pinter from Russell Hoban's novel Turtle Diary, the film is about "people rediscovering the joys of life and love".

Independently, each perceives that the turtles are unnaturally confined, and they hatch a plan with the assistance of zookeeper George Fairbairn (Michael Gambon) to smuggle them out and release them into the sea.

In his 1985 review of the film for The Sunday Telegraph, David Castell observes that Pinter's screenplay concentrates on developing dialogue and plot, leaving clues for the actors to convey their characters' subtle emotional and psychological development: "It is hard to think of two actors better matched to play Pinter than Glenda Jackson and Ben Kingsley.

… Turtle Diary is a fine film that charts movingly the unnoticed despair of everyday lives, the sufferings of those who endure loneliness in silence.