The 2005 MAC men's basketball tournament, a part of the 2004-05 NCAA Division I men's basketball season, took place from March 7–12 at Gund Arena in Cleveland. Its winner received the Mid-American Conference's automatic bid to the 2005 NCAA tournament. It is a single-elimination tournament with four rounds and the three highest seeds received byes in the first round. All MAC teams were invited to participate. Miami, the MAC regular season winner, received the number one seed in the tournament. Fourth-seeded Ohio beat Miami in the semi-finals and defeated second-seeded Buffalo in overtime in the final. In the NCAA Ohio lost in the first round to Florida. Leon Williams of Ohio was named the tournament MVP.

Tournament

Seeds

Bracket

First round

Quarterfinals

Semifinals

Finals