John J. Mazach (born 1944) is a vice admiral who retired from the United States Navy in 1998. His last assignment on active duty was commander of Naval Air Forces Atlantic. As a retiree, he became an advisor to the Naval Reserve Officers Training Corps at Vanderbilt University, of which he was a 1966 alumnus. As of 2011 he is married to Vanderbilt alumna Pat Waggoner Mazach and lives in Virginia Beach, Virginia.