Don Martin Mankiewicz (January 20, 1922 – April 25, 2015) was a screenwriter and novelist.
Born in Berlin, Germany, he was the son of Sara (Aaronson) and the screenwriter Herman J. Mankiewicz and brother of journalist Frank Mankiewicz.
His 1955 novel Trial won the Harper Prize and was made into a film of the same name. He was nominated for an Academy Award for Writing Adapted Screenplay for I Want to Live! (1958). Among his many television credits are Ironside, for which he wrote the pilot, the Star Trek episode "Court Martial", and the mini-series adaptation of President John F. Kennedy's book, Profiles in Courage. His son is screenwriter/producer John Mankiewicz (Mankiewicz family).