The 1983–84 Illinois Fighting Illini men's basketball team represented the University of Illiniois.

Regular season

The 1983–84 season brought Illinois its 12th Big Ten Conference championship in a season where Illinois had four overtime games including an epic four-overtime 75–66 victory over Michigan. The next game was a two-overtime win at Iowa, Lou Henson’s 400th victory as a college head coach. The Illini recorded a 26-5 mark and were 15-3 in Big Ten play, tying Purdue for the league title. This season also marked Illinois’ first back-to-back 20 win seasons since 1951–52. The Illini would go on to record a total of nine consecutive 20-win seasons from 1982–83 to 1990–91. Illinois advanced to the NCAA Regional Finals before dropping a heart-breaking 54–51 loss to Kentucky on its home court, causing the NCAA to put a rule in place not allowing a school to play in a tournament game on its home court. Rumors also were floated that the outcome was predetermined, with home team time clock operations being implicated in part.

Roster

Schedule

Source !colspan=12 style="background:#DF4E38; color:white;"| Non-Conference regular season !colspan=9 style="background:#DF4E38; color:#FFFFFF;"| Big Ten regular season !colspan=9 style="text-align: center; background:#DF4E38"| NCAA Tournament

Player stats

Awards and honors

Team players drafted into the NBA

Rankings