The Magic Box is a 1951 British Technicolor biographical drama film directed by John Boulting. The film stars Robert Donat as William Friese-Greene, with numerous cameo appearances by performers such as Peter Ustinov and Laurence Olivier. It was produced by Ronald Neame and distributed by British Lion Film Corporation.

The film was a project of the Festival of Britain and adapted by Eric Ambler from the controversial biography by Ray Allister.

This biographical drama gives an account of William Friese-Greene, who designed and patented one of the earliest working cinematic cameras. Told in flashback, the film follows Friese-Greene's obsessional pursuit of recording the "moving image", to the neglect of his financial situation, and the problems this causes in his two marriages.