2005 Big West Conference men's basketball tournament

The Aggies earned the conference's automatic bid to the 2005 NCAA Division I men's basketball tournament as the #14 seed in the Chicago regional.

Pacific received an at-large bid as the #8 seed in the Albuquerque regional.

This year marks the most recent time the Big West Conference has received more than one bid to the NCAA Division I men's basketball tournament.

Eight of the ten teams in the conference participated, with UC Riverside and Cal Poly not qualifying.

Teams were seeded based on regular season conference records.