| Leon Exelby | |
| Birth Date: | 1888 |
| Death Place: | Owosso, Michigan, U.S. |
| Player Sport1: | Football |
| Player Years2: | 1907–1910 |
| Player Team2: | Michigan Agricultural |
| Player Positions: | Fullback |
| Coach Sport1: | Football |
| Coach Years2: | 1912 |
| Coach Team2: | Wyoming |
| Coach Sport3: | Basketball |
| Coach Years4: | 1912–1913 |
| Coach Team4: | Wyoming |
| Overall Record: | 2–7 (football) 2–5 (basketball) |
Leon C. "Ex" Exelby (1888 – September 29, 1962) was an American football player and coach of football and basketball. He played college football at Michigan Agricultural College—now known as Michigan State University—from 1907 to 1910. He was captain of the 1910 Michigan Agricultural team. Playing as a fullback, he was selected by Walter Eckersall to the 1910 All-Western college football team.[1] Exelby served as the head football coach at the University of Wyoming for one season in 1912, compiling a record of 2–7. He was also Wyoming's head basketball coach that academic year, 1912–13, tallying a mark of 2–5. Exelby died on September 29, 1962, in Owosso, Michigan.[2]