| Year: | 1991 |
| Team: | Colorado Buffaloes |
| Conference: | Big Eight Conference |
| Short Conf: | Big 8 |
| Aprank: | 20 |
| Coachrank: | 20 |
| Record: | 8–3–1 |
| Conf Record: | 6–0–1 |
| Hc Year: | 10th |
| Dc Year: | 4th |
| Stadium: | Folsom Field (Capacity: 51,748) |
| Champion: | Big Eight co-champion |
| Bowl Result: | L 25–30 vs. Alabama |
The 1991 Colorado Buffaloes football team represented the University of Colorado at Boulder in the 1991 NCAA Division I FBS football season. The team was coached by 10th year head coach Bill McCartney, played their home games in Folsom Field in Boulder, Colorado, and were members of the Big Eight Conference. They finished with a record of 8–3–1 (6–0–1 Big 8) to finish as co-conference champions, and they lost to Alabama 30–25 in the 1991 Blockbuster Bowl. In the final AP Poll and Coaches' Poll, Colorado was ranked #20 in both polls.
See also: 1991 Nebraska Cornhuskers football team and Colorado–Nebraska football rivalry.
Colorado clinched share of Big Eight conference title for third straight season.[2]
The following Buffaloes were selected in the 1992 NFL draft after the season.[3]
| 3 | 67 | Joel Steed | Defensive tackle | Pittsburgh Steelers | |
| 6 | 143 | Rico Smith | Wide receiver | Cleveland Browns | |
| 9 | 242 | Darian Hagan | Wide receiver | San Francisco 49ers | |
| 9 | 244 | Jay Leeuwenburg | Center | Kansas City Chiefs |