Joseph Clark Grew (May 27, 1880 – May 25, 1965) was an American career diplomat and Foreign Service officer.
Is best known as ambassador to Japan, 1932-1941, and a high official in the State Department in Washington, 1944-1945, where he opposed hardliners, sought to avoid war, and sought a soft Japanese surrender in 1945 that enabled a peaceful American occupation of Japan after the war.
After numerous minor diplomatic appointments, Grew was the Ambassador to Denmark (1920–1921) and Ambassador to Switzerland (1921–1924).
In 1924, Grew became the Under Secretary of State, and in this position he oversaw the establishment of the U.S.
Foreign Service.
Grew was the Ambassador to Turkey (1927–1932) and the Ambassador to Japan 1932-1941, where he opposed American hardliners and recommended negotiation with Tokyo to avoid war.
He was the ambassador in Tokyo at the time of the Japanese attack on Pearl Harbor (December 8, 1941) as well and was interred until American and Japanese diplomats were formally exchanged in 1942.
on return to Washington he became the number two official in the State Department as Under Secretary, and sometimes served as acting Secretary of State.
He promoted a soft peace with Japan that would allow the Emperor to maintain his status, which did become policy and which facilitated the Emperor's decision to surrender in 1945.