| Year: | 2005 |
| Conference: | Big Sky Conference |
| Division: | I |
| Gender: | Men's |
| Teams: | 6 |
| 1Stroundarena: | campus sites |
| Semicity: | Portland, OR |
| Finalarena: | Memorial Coliseum |
| Finalcity: | Portland, OR |
| Champions: | Montana |
| Titlecount: | 5th |
| Coach: | Larry Krystkowiak |
| Coachcount: | 1st |
| Mvp: | Kamarr Davis |
| Mvpteam: | Montana |
The 2005 Big Sky men's basketball tournament was played from March 5 to March 9. The First Round of the tournament was held at the higher seed's home arena, and the semi-finals and championship were held at the Memorial Coliseum in Portland, Oregon, which is the home of regular season champion Portland State. The top 6 teams from regular season play qualified and the top 2 teams received a bye to the semi-finals. The tournament was won by Montana and they received an automatic bid to the 2005 NCAA Men's Division I Basketball Tournament.[1]