| Year Game Played: | 2005 |
| Title Sponsor: | Dr Pepper |
| Game Name: | Big 12 Championship Game |
| Subheader: | Conference Championship |
| Football Season: | 2005 |
| Visitor Name Short: | Texas |
| Visitor Nickname: | Longhorns |
| Visitor School: | University of Texas |
| Home Name Short: | Colorado |
| Home Nickname: | Buffaloes |
| Home School: | University of Colorado |
| Visitor Record: | 11–0 |
| Home Record: | 7–4 |
| Visitor Coach: | Mack Brown |
| Home Coach: | Gary Barnett |
| Visitor Rank Ap: | 2 |
| Visitor Rank Coaches: | 2 |
| Visitor Rank Bcs: | 2 |
| Home Rank Ap: | NR |
| Home Rank Coaches: | NR |
| Home Rank Bcs: | NR |
| Visitor 1Q: | 14 |
| Visitor 2Q: | 28 |
| Visitor 3Q: | 28 |
| Visitor 4Q: | 0 |
| Home 1Q: | 0 |
| Home 2Q: | 3 |
| Home 3Q: | 0 |
| Home 4Q: | 0 |
| Date Game Played: | December 3 |
| Stadium: | Reliant Stadium |
| City: | Houston, Texas |
| Referee: | Tom Walker |
| Attendance: | 71,107 |
| Us Network: | ABC |
| Us Announcers Link: | List of announcers of major college bowl games |
| Us Announcers: | Brad Nessler and Bob Griese |
The 2005 Dr Pepper Big 12 Championship Game was held at Reliant Stadium on December 3, 2005. The game saw the Big 12 South champions Texas Longhorns take on the Colorado Buffaloes, winners of the Big 12 North. Texas, undefeated and at #2 in the BCS standings, was looking to travel to the national championship.
Texas defeated Colorado, 70–3.[1] The win was the 8th largest margin of victory in Texas football history, and sent the Longhorns to the BCS title game in Pasadena, where they defeated USC 41–38. The game would also be the last for Colorado head coach Gary Barnett, who was replaced on December 15 by Dan Hawkins. Colorado would go on to lose 19–10 to Clemson in the Champs Sports Bowl.