John Bruce Medaris (12 May 1902 – 11 July 1990) was an officer in the United States Army during World War II and post war government administrator overseeing development of ballistic missiles. During World War II Medaris was a colonel in the ordnance corps of the First Army, participating in the North Africa campaign, the Allied invasion of Sicily, Normandy landings, the Battle of the Bulge, and the invasion of Germany. After the Defense department removed responsibilities for long-range ballistic missiles from the Army, Medaris retired and wrote a critical memoir.