The 2018 Big West Conference men's basketball tournament was the postseason men's basketball tournament for the Big West Conference of the 2017–18 NCAA Division I men's basketball season. It was held from March 8–10, 2018 at the Honda Center in Anaheim, California. No. 4 seed Cal State Fullerton defeated No. 3 seed UC Irvine in the championship game to win the tournament winner and receive the conference's automatic bid to the NCAA tournament.