| Bill McElwain | |
| Birth Date: | 14 May 1903 |
| Birth Place: | Chicago, Illinois, U.S. |
| Death Place: | Big Rapids, Michigan, U.S. |
| Player Sport1: | Football |
| Player Years2: | 1921–1923 |
| Player Team2: | Northwestern |
| Player Years3: | 1924 |
| Player Team3: | Chicago Cardinals |
| Player Years4: | 1925 |
| Player Team4: | Chicago Bears |
| Player Years5: | 1926 |
| Player Team5: | Chicago Cardinals |
| Player Positions: | Halfback |
| Coach Sport1: | Football |
| Coach Years2: | 1927–1939 |
| Coach Team2: | Ferris Institute |
| Coach Sport3: | Basketball |
| Coach Years4: | 1927–1940 |
| Coach Team4: | Ferris Institute |
| Admin Years1: | 1927–? |
| Admin Team1: | Ferris Institute |
| Overall Record: | 31–44–7 (football) 109–127 (basketball) |
William Thompson McElwain (May 14, 1903 – November 26, 1996) was an American football player and coach of football and basketball. McElwain played college football at Northwestern University and professionally in the National Football League (NFL) with the Chicago Cardinals and alongside Red Grange with the Chicago Bears.[1] McElwain served as the head football coach at Ferris Institute—now known as Ferris State University—in Big Rapids, Michigan from 1927 to 1939, compiling a record of 31–44–7.[2] He was also the head basketball coach at Ferris State from 1927 to 1940, tallying a mark of 109–127.