Reginald H. "Reg" Threlfall (1903 – February 16, 1971) was an American football, basketball and Canadian football coach. He served as the head football coach at South Dakota State University in Brookings, South Dakota from 1934 to 1937. Threlfall was the head coach of the Winnipeg Blue Bombers of the Canadian Football League from 1938 to 1944.
|Died||February 16, 1971|
Sioux City, Iowa
|Coaching career (HC unless noted)|
|1934–1937||South Dakota State|
|1938–1944||Winnipeg Blue Bombers|
|1936–1937||South Dakota State|
|Administrative career (AD unless noted)|
|1935||South Dakota State|
- "Reginald Threlfall". Find a Grave. Retrieved October 18, 2018.
- "Memory Of Friends Glows Through The Golden Years". Yankton.net. Retrieved October 18, 2018.
- "Winnipeggers Love Him". Winnipeg Free Press. February 18, 1971. Retrieved October 18, 2018.