The 2020–21 Colorado State Rams men's basketball team represented Colorado State University during the 2020–21 NCAA Division I men's basketball season.

The Rams played their home games at Moby Arena on CSU's main campus in Fort Collins, Colorado as members of the Mountain West Conference.

They received an invitation to the NIT where they defeated Buffalo and NC State to advance to the semifinals where they lost to Memphis.

They played the third-place game where they lost to Louisiana Tech.

They lost in the first round of the Mountain West tournament to Wyoming.