| Mode: | football |
| Year: | 2005 |
| Team: | BYU Cougars |
| Conference: | Mountain West |
| Short Conf: | MW |
| Record: | 6–6 |
| Conf Record: | 5–3 |
| Head Coach: | Bronco Mendenhall |
| Hc Year: | 1st |
| Off Coach: | Robert Anae |
| Oc Year: | 1st |
| Off Scheme: | Air raid |
| Def Scheme: | 3–3–5[1] |
| Stadium: | LaVell Edwards Stadium |
| Bowl: | Las Vegas Bowl |
| Bowl Result: | L 28 - 35 vs. California |
The 2005 BYU Cougars football team represented Brigham Young University during the 2005 NCAA Division I-A football season.
•SportsWest Productions (SWP) games were shown locally on KSL 5.