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

This was head coach Stew Morrill's 11th season at Utah State.

The Aggies played their home games at the Dee Glen Smith Spectrum and were members of the Western Athletic Conference.

They also won the 2009 WAC men's basketball tournament to earn an automatic bid to the 2009 NCAA Division I men's basketball tournament.

6 seed and AP #23 Marquette in the first round.