The 2009 National Invitation Tournament was a single-elimination tournament of 32 National Collegiate Athletic Association (NCAA) Division I teams that were not selected to participate in the 2009 NCAA Men's Division I Basketball Tournament. The 72nd annual tournament began on March 17 on campus sites and ended on April 2 at Madison Square Garden in New York City, with Penn State winning the final 69–63 over Baylor.
The following teams won their conference regular season title, but failed to win conference post season tournaments. Therefore they were not awarded their respective conference's automatic bid to the NCAA Tournament. When they did not receive at-large selections to the NCAA tournament either, they automatically qualified for the 2009 NIT.
Played on the home court of the higher-seeded team (except #4 Miami (FL) at #5 Providence)
Semifinals and finals
Played at Madison Square Garden in New York City on March 31 and April 2
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||San Diego State
* denotes each overtime played
The Penn State Nittany Lions faced off against the Baylor Bears in the NIT Championship game. The Nittany Lions won the matchup 69–63, aided by Jamelle Cornley's 18 points. In a four-point deficit at the half, the Lions went on a 7–1 spurt to take a 2-point lead at the beginning of the second. After the Bears tied it at 37, Penn State made three consecutive threes from which Baylor could not recover.