The 2009–10 Colorado State Rams men's basketball team represented Colorado State University in the 2009–10 NCAA Division I men's basketball season.

The Rams were led by head coach Tim Miles in his third year leading the team.

Colorado State played their home games at Moby Arena in Fort Collins, Colorado, as members of the Mountain West Conference.

The Rams finished conference play with a 7–9 record, earning the fifth seed in the Mountain West tournament.

The Rams were eliminated in the first round of the CBI by Morehead State, 74–60.