Tom Mankiewicz (born June 1, 1942) is an American screenwriter and director. A graduate of Yale University, he is the son of Joseph L. Mankiewicz and the nephew of Herman J. Mankiewicz.

Tom Mankiewicz wrote or co-wrote the screenplays for Mother, Jugs & Speed, The Cassandra Crossing and The Eagle Has Landed. He also wrote the book for the short-lived 1970 Broadway musical Georgy.

He is best known for working on the screenplays for the James Bond movies Diamonds Are Forever, Live and Let Die and The Man with the Golden Gun. He received sole credit for Live and Let Die and shared credit on the other two with Richard Maibaum. He also did uncredited work on The Spy Who Loved Me and Moonraker.