Hajime Sugiyama was a Japanese field marshal and one of Japan's military leaders for most of the Second World War. As Army Minister in 1937, Sugiyama was a driving force behind the launch of hostilities against China in retaliation for the Marco Polo Bridge Incident. After being named the Army’s Chief of Staff in 1940, he became a leading advocate for expansion into Southeast Asia and preventive war against the United States. Upon the outbreak of hostilities in the Pacific theater of World War II, Sugiyama served as the army’s de facto commander-in-chief until his removal by Prime Minister Hideki Tojo in February 1944. Following Tojo's ouster in July 1944, he once again held the post of Army Minister in Kuniaki Koiso's cabinet until its dissolution in April 1945. Ten days after Japan's surrender on 2 September 1945, he committed suicide.

Rikugun-gensui , formal rank designations: Gensui-rikugun-taishō was the highest title in the pre-war Imperial Japanese military.