Henry Morgenthau (; April 26, 1856 – November 25, 1946) was an American lawyer, businessman and United States ambassador, most famous as the American ambassador to the Ottoman Empire during the First World War.
As ambassador to the Ottoman Empire, Morgenthau has come to be identified as the most prominent American to speak about the Armenian Genocide.Morgenthau was the father of the politician Henry Morgenthau Jr.
His grandchildren included Robert M.
Morgenthau, District Attorney of Manhattan for 35 years, and Barbara W.
Tuchman, a historian who won the Pulitzer Prize for her book The Guns of August.