Henry Morgenthau III (January 11, 1917 – July 10, 2018) was an American author and television producer. He was a member of the Morgenthau dynasty and of the Lehman family. He was the son of Henry Morgenthau Jr., who was Franklin D. Roosevelt's Treasury Secretary. He wrote "Mostly Morgenthaus: A Family History" (1991). In 2016, at the age of 99, Morgenthau III published his first book of poetry entitled "A Sunday in Purgatory."