| Mark Duncan | |
| Birth Date: | c. 1919 |
| Death Date: | July 1993 |
| Player Sport1: | Football |
| Player Years2: | 1937–1940 |
| Player Team2: | Denver |
| Player Sport3: | Basketball |
| Player Years4: | 1938–1939 |
| Player Team4: | Denver |
| Player Positions: | Guard (football) |
| Coach Sport1: | Football |
| Coach Years2: | 1941 |
| Coach Team2: | Colorado A&M (assistant) |
| Coach Years3: | 1943 |
| Coach Team3: | Denver |
| Coach Years4: | 1947–1952 |
| Coach Team4: | Colorado A&M (line) |
| Coach Years5: | 1953–1954 |
| Coach Team5: | Colorado A&M (backfield) |
| Coach Years6: | 1955–1962 |
| Coach Team6: | San Francisco 49ers (DB) |
| Coach Sport7: | Basketball |
| Coach Years8: | 1943 |
| Coach Team8: | Denver (interim HC) |
| Coach Sport9: | Baseball |
| Coach Years10: | 1948–1955 |
| Coach Team10: | Colorado A&M |
| Admin Years1: | 1964–1967 |
| Admin Team1: | NFL (supervisor of officials) |
| Admin Years2: | 1968–1972 |
| Admin Team2: | NFL (dir. personnel) |
| Admin Years3: | 1973–1974 |
| Admin Team3: | Los Angeles Rams (dir. player personnel) |
| Admin Years4: | 1975–1978 |
| Admin Team4: | Seattle Seahawks (asst. GM) |
| Overall Record: | 2–5 (football) 8–6 (basketball) 68–60–1 (baseball) |
Mark C. Duncan (c. 1919 - July 1993) was an American football player, coach, and administrator, and basketball coach. He served as the head football coach and the interim head basketball coach at the University of Denver in 1943.[1]
Duncan later embarked on a career in the National Football League (NFL). He was an assistant coach for the San Francisco 49ers from 1955 to 1962.[2]
In 1964, Duncan was named the NFL's supervisor of officials, and three years later, he was named the League's director of personnel. From 1973 to 1974, he was the director of player personnel for the Los Angeles Rams, and from 1975 to 1978, he served as an assistant general manager for the Seattle Seahawks.[3]
Duncan died in July 1993 at the age of 75.[4]