1999 Big West Conference men's basketball tournament

The 1999 Big West Conference men's basketball tournament was held March 4–6 at Lawlor Events Center in Reno, Nevada.

defeated in the championship game, 79–69, to obtain the third Big West Conference Men's Basketball Tournament championship in school history.

The Aggies participated in the 1999 NCAA Division I men's basketball tournament after earning the conference's automatic bid.

Format
Eight of the 12 teams in the conference participated, with, , , and UC Irvine not qualifying. The top eight teams were seeded based on regular season conference records.