The White Unicorn is a 1947 British drama film directed by Bernard Knowles and starring Margaret Lockwood, Joan Greenwood, Ian Hunter and Dennis Price. Kyra Vayne appeared as the singer. It was made at Walton Studios by the independent producer John Corfield, and released by General Film Distributors. The film's sets were designed by Norman G. Arnold. It was also known as Milkwhite Unicorn and Bad Sister.

Margaret Mary Day Lockwood, CBE, was an English actress. One of Britain's most popular film stars of the 1930s and 1940s, her film appearances included The Lady Vanishes (1938), Night Train to Munich (1940), The Man in Grey (1943), and The Wicked Lady (1945). She was nominated for the BAFTA Award for Best British Actress for the 1955 film Cast a Dark Shadow. She also starred in the television series Justice (1971–74).