| Leo Traister | |
| Birth Date: | 9 September 1919 |
| Birth Place: | Sterling, Illinois, U.S. |
| Death Place: | Eureka, Illinois, U.S. |
| Player Sport1: | Football |
| Player Team2: | Eureka |
| Player Sport3: | Baseball |
| Player Team4: | Eureka |
| Player Sport5: | Track |
| Player Team6: | Eureka |
| Coach Sport1: | Football |
| Coach Years2: | 1948–1955 |
| Coach Team2: | Viola/Winola HS (IL) |
| Coach Years3: | 1956–1966 |
| Coach Team3: | Eureka |
| Coach Sport4: | Basketball |
| Coach Years5: | 1948–1956 |
| Coach Team5: | Viola/Winola HS (IL) |
| Coach Years6: | 1957–1975 |
| Coach Team6: | Eureka |
| Coach Sport7: | Track |
| Coach Years8: | 1948–1956 |
| Coach Team8: | Viola/Winola HS (IL) |
| Admin Years1: | 1956–? |
| Admin Team1: | Eureka |
| Overall Record: | 11–62–6 (college football) 168–195 (college basketball) |
Leo Owen "Doc" Traister (September 9, 1919 – September 26, 2020) was an American football and basketball coach. He was the ninth head football coach at Eureka College in Eureka, Illinois, serving for 11 seasons, from 1956 until 1966, and compiling a record of 11–62–6.[1] Traister was also the head basketball coach at Eureka for 17 seasons, from 1957 to 1974, tallying a mark of 168–195.
Traister was a World War II veteran.[2] He died on September 26, 2020, in Eureka.[3]