The 2008–09 New Mexico State Aggies men's basketball team represented New Mexico State University in the 2008–09 college basketball season.

This was Marvin Menzies 2nd season as head coach.

The Aggies played their home games at Pan American Center and competed in the Western Athletic Conference.

They lost in the 2nd round of the 2009 WAC men's basketball tournament to end the season.

During the Jan 31, 2009 game against Hawaii, a ceremony was held which added new Aggies to the Ring of Honor - they were Jimmy Collins, Jerry Hines, and John Williamson.