The 1998–99 Arizona Wildcats men's basketball team represented the University of Arizona in the 1998–99 NCAA Division I men's basketball season.
The head coach was Lute Olson.
The team played its home games in the McKale Center in Tucson, Arizona, and was a member of the Pacific-10 Conference.
The Wildcats finished the season in second place in the Pacific-10 conference with a 13–5 record.
Arizona reached the 1999 NCAA Division I men's basketball tournament, losing to Oklahoma in the first round and finishing the season with a 22–7 record.