| Fritz S. Brennecke | |
| Birth Date: | 28 August 1911 |
| Birth Place: | Montana, U.S. |
| Player Years1: | 1932–1934 |
| Player Team1: | Colorado Agricultural |
| Coach Years1: | 1936 |
| Coach Team1: | Steamboat Springs HS (CO) |
| Coach Years2: | 1937–1941 |
| Coach Team2: | Golden HS (CO) |
| Coach Years3: | 1942 |
| Coach Team3: | Denver South HS (CO) |
| Coach Years4: | 1946 |
| Coach Team4: | Denver South HS (CO) |
| Coach Years5: | 1947–1968 |
| Coach Team5: | Colorado Mines |
| Overall Record: | 78–113–8 (college) |
| Championships: | 2 RMC (1951, 1958) |
Fritz S. Brennecke (August 28, 1911 – September 23, 1996) was an American football player and coach. He served as the head football coach at the Colorado School of Mines in Golden, Colorado from 1947 to 1968, compiling a record of 78–113–8.[1] Brennecke played college football at Colorado Agricultural College (now known as Colorado State University) in Fort Collins, Colorado from 1932 to 1934.[2] After graduating, he served as a high school football coach at several locations in Colorado.[3]