The 2004–05 Utah State Aggies men's basketball team represented Utah State University in the 2004–05 college basketball season.

This was head coach Stew Morrill's 7th season at Utah State.

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

They won the Big West tournament to earn an automatic bid to the 2005 NCAA Division I men's basketball tournament as No.

3 seed Arizona in the opening round.