Hong Sa-ik (Korean: 홍사익; 4 March 1889 – 26 September 1946),[1] also known by the Japanese reading of his name Kō Shiyoku (洪 思翊), was a lieutenant general in the Imperial Japanese Army and the top-ranking ethnic Korean in Japan to be charged with war crimes relating to the conduct of the Empire of Japan in World War II.

[2] Hong was held responsible for all the atrocities committed by Imperial Japanese Army prison guards against Allied POWs in Philippines, and was hanged in 1946.

With the abolition of the academy in 1909, he transferred to Japan's Central Military Preparatory School (陸軍中央幼年学校, Rikugun Chūō Yōnen Gakkō) as a government-financed student along with Crown Prince Yi Un on the orders of dethroned Emperor Gojong.

He was promoted to lieutenant general in October of the same year, and remained in the Philippines with the 14th Area Army, serving as its chief logistics officer until the cessation of hostilities.

His eldest son, Hong Guk-seon, graduated from Japan's Waseda University and afterwards worked in the Bank of Joseon, but was removed from his position on the orders of Syngman Rhee.