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.

Sir Terence Mervyn Rattigan was a British dramatist and screenwriter. He was one of England's most popular mid-20th-century dramatists. His plays are typically set in an upper-middle-class background. He wrote The Winslow Boy (1946), The Browning Version (1948), The Deep Blue Sea (1952) and Separate Tables (1954), among many others.