John Henry Mohardt (January 21, 1898 – November 24, 1961) was an American football and baseball player and medical doctor. Mohardt attended the University of Notre Dame from 1918 through 1921 where he played football under Knute Rockne and also competed in baseball and track and field. He was selected as an All-American halfback in 1921 but lost his last year of collegiate eligibility for participating in a professional football game against the Green Bay Packers in December 1921.