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.
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