June 5, 1885|
|Coaching career (HC unless noted)|
|1909||Newton HS (MA)|
|1913||Salem HS (MA)|
|1915||English HS (MA)|
|Head coaching record|
Harold Sullivan "Harry" McDevitt (June 5, 1885– ?) was an American college football and baseball coach. He served as the head football coach at the Catholic University of America in 1912 and Colgate University in 1917. He coached baseball at Colby College. McDevitt played as a quarterback at Dartmouth College in 1906, where he also later served as an assistant football coach.
McDevitt was born on June 5, 1885 in Boston, and attended Brighton High School. He then went on to Dartmouth College, where he played baseball from 1905 to 1907 and as a reserve quarterback on the 1906 football team. He was also a member of the Theta Delta Chi fraternity and the College Glee Club. McDevitt graduated in 1907. The following year, he was an assistant coach for the football team.
In 1909, he coached the baseball team at Colby College in Waterville, Maine. That fall, he was hired as the head coach at Newton High School in Newton, Massachusetts. In 1910, McDevitt again returned to his alma mater to mentor the quarterbacks. In 1911, he served as the coach at Colby College.
In 1912, McDevitt served as the head coach at the Catholic University of America and compiled a 3–5 record. The following year, he returned to Massachusetts as the coach at Salem High School, where he was charged with rebuilding the team. In 1915, McDevitt coach English High School in Lynn, Massachusetts. In September 1917, Colgate University hired McDevitt as its 18th head football coach to replace E.C. Huntington who had joined the U.S. Army. He held that post for one season and amassed a 4–2 record. 
- Emerson, Charles Franklin (1911). General Catalogue of Dartmouth College and the Associated Schools 1769-1910. Concord, New Hampshire: Rumford Press. p. 437. Retrieved October 31, 2011.
- The Dartmouth, Volume 30, p. 504, Dartmouth College, 1908.
- MANY OUT FOR SCHOOL TEAM. English High Has 40 Players on Field. About That Number Report at Somerville High. Harry Heneage to Coach Newton High Squad., The Boston Daily Globe, September 15, 1908.
- 2010 Dartmouth Baseball Media Guide, p. 66, Dartmouth College, 2010.
- Brown Victorious Over Dartmouth, The St. John Sun, November 26, 1906.
- The Shield: Official Publication of the Theta Delta Chi Fraternity, Volume 27, p. 352, Theta Delta Chi, February 1911.
- The Dartmouth, p. 357.
- The Dartmouth, p. 174.
- COLBY COLLEGE NOTES, Lewiston Saturday Journal, April 14, 1909.
- McDEVITT IS CHOSEN. Old Dartmouth Man Will Coach Newton High, Football Team Given a Stiff Day's Work by New Teacher. HARVARD GETS LARGE. Three Other Regulars of the Phillips- Andover Eleven to Go to Yale. CORNELL CHOSEN CAPTAIN. Freeport, Penn, Man Will Lead the Exeter Football Team Next Year. Wendell Acad 5, Arlington H. S. 2d 0 Woburn H. S. 46, Reading H. S. 0., The Boston Daily Globe, November 9, 1909.
- DARTMOUTH HAS HARD PRACTISE; Varsity Put Through Strenuous Drill--Second Team and Freshmen in No-Score Game, Christian Science Monitor, October 11, 1910.
- Varsity success (1910-50), All-time Football Results, The Catholic University of America, retrieved February 13, 2009.
- Other Football Activities, Boston Evening Transcript, September 17, 1913.
- WALTHAM HIGH SWAMPS LYNN ENGLISH H.S., 81-0, The Boston Daily Globe, September 26, 1915.
- McDEVITT TO COACH COLGATE, Christian Science Monitor, September 15, 1917.
- 2007 Colgate Football Media Guide, Colgate University, 2007.