| Earl C. Hayes | |
| Birth Date: | 21 November 1884 |
| Birth Place: | near Madison, Indiana, U.S. |
| Death Place: | Bloomington, Indiana, U.S. |
| Alma Mater: | Albion College[1] |
| Coach Sport1: | Football |
| Coach Years2: | 1914–1916 |
| Coach Team2: | Mississippi A&M |
| Coach Years3: | 1931–1933 |
| Coach Team3: | Indiana |
| Coach Sport4: | Basketball |
| Coach Years5: | 1911–1924 |
| Coach Team5: | Mississippi A&M |
| Coach Sport6: | Track and field |
| Coach Years7: | 1924–1943 |
| Coach Team7: | Indiana |
| Overall Record: | 21–22–6 (football) 124–54 (basketball) |
| Championships: | Basketball 4 SIAA regular season (1912–1914, 1916) |
Earl C. "Billy" Hayes (November 21, 1884 – December 16, 1943) was an American football, basketball, and track and field coach. Hayes served as the head football coach at Mississippi Agricultural & Mechanical College—now known as Mississippi State University—from the 1914 to 1916 seasons. During his three-season tenure, he compiled an overall record of 15–8–2.[2] [3] At Mississippi A&M, he was also as the head basketball coach from 1912 to 1924, tallying aa mark of 124–54.[4] From 1924 to 1943, he coached track and field at Indiana University Bloomington. Hayes was also the head football coach at Indiana from 1931 to 1933, compiling a record of 6–14–4.
Hayes died of pneumonia at age 59 on December 16, 1943, in Bloomington, Indiana.[5]