Joseph L. Mankiewicz
- Gender: Male
- Birthday: 1909-02-11
- Day of Death: 1993-02-05 ( 84 years old )
- Place of Birth: Wilkes-Barre, Pennsylvania, USA
- Also Known As: Joseph Leo Mankiewicz / Joseph Mankiewicz / Joe Mankiewicz
Joseph Leo Mankiewicz was an American film director, screenwriter, and producer. Mankiewicz had a long Hollywood career and is best known as the writer-director of the Oscar-winning All About Eve (1950). He was brother to screenwriter and drama critic Herman J. Mankiewicz who also won an Oscar for co-writing Citizen Kane (1941).