Sleuth is a 1972 mystery thriller film directed by Joseph L. Mankiewicz and starring Laurence Olivier and Michael Caine. The screenplay by playwright Anthony Shaffer was based on his 1970 Tony Award-winning play. Both Olivier and Caine were nominated for Academy Awards for their performances. This was Mankiewicz's final film. Critics gave the film overwhelmingly positive reviews.

Joseph Leo Mankiewicz was an American film director, screenwriter, and producer. Mankiewicz had a long Hollywood career, and won both the Academy Award for Best Director and the Academy Award for Best Adapted Screenplay in consecutive years for A Letter to Three Wives (1949) and All About Eve (1950), the latter of which was nominated for 14 Academy Awards and won six.