Jadarion Johntavian (born January 18, 1994), better known as J. D. Harmon, is an American former football safety. He signed with the Cleveland Browns as an undrafted free agent in 2017. He played college football at Kentucky.
Harmon signed with the Cleveland Browns as an undrafted free agent on May 4, 2017. He was waived on 1 September 2017 during roster cutdowns.