O Jin-u (March 8, 1917 – February 25, 1995) was a general and politician of North Korea. He was the Minister of Armed Forces from May 1976 until his death in February 1995. O was considered the third most powerful person in North Korea, after Kim Il-sung and his son Kim Jong-il, therefore making him the most powerful person that possessed no blood relations to the Kim family. Very little is known about him except for the fact that he served with Kim Il-sung's partisan unit and eventually rose through the ranks of the North Korean Army. He distinguished himself during the Korean War and was a trusted adviser of the North Korean leader until his death, also being his chief guard in 1945.