John Thomas O'Leary[1] (February 12, 1929 – December 2, 1983)[2] was an American football and basketball coach and college athletics administrator.
He served as the head football coach at St. Mary of the Plains College in Dodge City, Kansas from 1960 to 1962, compiling a record of 8–18.
He began his college football career in 1948 at the University of Miami, playing halfback for head coach Andy Gustafson.
[3] O'Leary served in the United States Army during the Korean War, later becoming a commissioned officer.
In 1954, O'Leary was an assistant football coach at his alma mater, Portsmouth High School, before moving to New Hampshire Technical Institute—now known as NHTI, Concord's Community College—in Concord, New Hampshire to serve as athletic director and head basketball coach.