| Reginald D. Root | |
| Coach Sport1: | Men's lacrosse |
| Coach Years2: | 1929–1931 1936–1943 |
| Coach Team2: | Yale |
| Coach Sport3: | Football |
| Coach Years4: | 1933 |
| Coach Team4: | Yale |
| Coach Years5: | 1941 |
| Coach Team5: | Yale (assistant) |
| Overall Record: | 42–27–1 (men's lacrosse) 4–4 (football) |
Reginald D. Root was an American football and men's lacrosse coach at Yale University.
He served as the men's lacrosse coach for two stints, first during the 1929–1930 to 1930–1931 seasons and later during the 1936–1937 to 1942–1943 seasons while compiling a record of 42–27–1.[1] He also served as head football coach in 1933, compiling a record of 4–4.[2]
† Competed as an independent