Hong Sa-ik (Korean: 홍사익; 4 March 1889 – 26 September 1946), 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.
A graduate of the Imperial Japanese Army Academy, Hong was placed in command of the Japanese camps holding Allied (primarily U.S. and Filipino) prisoners of war in the Philippines during the latter part of World War II, where many of the camp guards were of Korean ethnicity.
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.