The Winslow Boy is a 1948 British drama film adaptation of Terence Rattigan's 1946 play The Winslow Boy. It was made by De Grunwald Productions and distributed by the British Lion Film Corporation. It was directed by Anthony Asquith and produced by Anatole de Grunwald with Teddy Baird as associate producer. The adapted screenplay was written by de Grunwald and Rattigan based on Rattigan's play. The music score was by William Alwyn and the cinematography by Freddie Young.

The film stars Robert Donat, Sir Cedric Hardwicke and Margaret Leighton with Basil Radford, Kathleen Harrison, Francis L. Sullivan, Marie Lohr and Jack Watling (who was also in the original West End theatre production). Also in the cast are Stanley Holloway, Mona Washbourne, Ernest Thesiger, Wilfrid Hyde-White, Lewis Casson, Cyril Ritchard and Dandy Nichols. Neil North, who plays the title role, also appeared in the 1999 film adaptation directed by David Mamet.