Hajime Sugiyama (?? ?, Sugiyama Hajime / Sugiyama Gen, January 1, 1880 – September 12, 1945) was a Japanese field marshal who served intermittently as Chief of the Imperial Japanese Army General Staff, and minister of war between 1937 and 1945.
As War Minister in 1937, he was one of the principal architects of the China Incident resulting in the Second Sino-Japanese War.
Later, as Army Chief of Staff in 1940 and 1941, he was a leading advocate of expansion into Southeast Asia and later preventive war against the United States.
Following the outbreak of hostilities in the Pacific on December 7, 1941, Sugiyama oversaw all army operations until being forced to resign by Prime Minister Hideki Tojo in February 1944.
After Tojo's ouster, he again held the post of Minister of War in Kuniaki Koiso's cabinet until its dissolution in April 1945.