Lloyd Trevalyn "Rosy" Harr (April 14, 1896 – December 23, 1982) was an American college football coach and athletics administrator. He served as the head football coach at the College of Emporia in Emporia, Kansas from 1928 to 1930 and again in 1942, compiling a record of 12–15–5. His 1928 team produced an undefeated record of 8–0, did not allow a single point, and was declared the champions of the newly-formed Central Intercollegiate Conference (CIC).[1] Harr was also the athletic director at the College of Emporia until his resignation in 1931.[2] He returned to the College of Emporia in 1942 as physical director and coach.[3]
Harr played football as an end and tackle for four seasons at the College of Emporia. His college career was interrupted by World War I, during which he served in the United States Army overseas with the 35th Infantry Division. After the war, he reentered college, and played under head coach Gwinn Henry.[4] Following his graduation from college, Harr went into the electrical business in Emporia for two years. He returned to the College of Emporia in 1924 as head of the physical training department for men and assistant coach under head coach Harold Grant.[5] Harr succeeed Grant as head football coach in 1928.[6]