The 2009 MAAC men's basketball tournament was an NCAA college basketball tournament held at the Times Union Center in Albany, New York on March 6–9, 2009, to decide the Metro Atlantic Athletic Conference champion.

The winner, Siena advanced to the 2009 NCAA Men's Division I Basketball Tournament, a 65-team event to decide the national champion of Division I college basketball.

8 seed Ohio State 74–72 in double overtime, then were defeated by No.

The top six teams received byes to the quarterfinals.

Teams were seeded by record within the conference, with a tiebreaker system to seed teams with identical conference records.