The 2008–09 Purdue Boilermakers men's basketball team represented Purdue University. The head coach was Matt Painter, then in his 4th season with the Boilers. The team played its home games in Mackey Arena in West Lafayette, Indiana, and is a member of the Big Ten Conference. The Boilermakers finished tied for second in the conference's regular season, and captured their first Big Ten tournament crown, defeating Ohio State 65–61 in the final game. In the NCAA tournament, the Boilers reached the Sweet Sixteen for the first time since 2000, where they fell to the Connecticut Huskies.

Matthew Curtis Painter is an American basketball coach and former player, who is the current and 19th head coach of the Purdue Boilermakers, serving in that role since 2005. He played college basketball at Purdue from 1989 to 1993. He was also the head coach of the Southern Illinois Salukis from 2003 to 2004.