The 2003 Big Sky Conference men's basketball tournament was held March 8–12 at the Dee Events Center at Weber State University in Ogden, Utah.
[1] Top-seeded Weber State defeated Eastern Washington in the championship game, 60–57, to win their seventh Big Sky men's basketball tournament title.
No new teams were added to the Big Sky prior to the 2002–03 season, leaving total membership at eight.
Despite joining the conference in 1996, this was Sacramento State's first appearance in a Big Sky tournament.
Only the top six teams from the regular season conference standings were invited to the tournament.