The 2004–05 Arizona Wildcats men's basketball team represented the University of Arizona during the 2004–05 NCAA Division I men's basketball season.

Hall-of-Famer Lute Olson led the team in his 22nd year as Arizona's head coach.

The team played their home games at McKale Center in Tucson, Arizona as members of the Pacific-10 Conference.

[2] Arizona was invited to the NCAA tournament for the 21st-straight season,[2] receiving a 3-seed in the Midwest Region.

The team advanced to the Elite Eight by defeating (14-seed) Utah State, (11) UAB, and (2) Oklahoma State before falling 90–89 in overtime to top-seeded Illinois.