Highly Dangerous is a 1950 British spy film starring Margaret Lockwood and Dane Clark. It was directed by Roy Ward Baker, based on a screenplay and novel The Dark Frontier written by Eric Ambler.

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).