Joseph Clark Grew was an American career diplomat and Foreign Service officer. He is best known as the ambassador to Japan from 1932 to 1941 and as a high official in the State Department in Washington from 1944 to 1945. He opposed American hardliners, sought to avoid war, and helped to ensure the soft Japanese surrender in 1945 that enabled a peaceful American occupation of Japan after the war.

Under Secretary of State (U/S) is a title used by senior officials of the United States Department of State who rank above the Assistant Secretaries and below the Deputy Secretary.