The 2003–04 UIC Flames men's basketball team represented the University of Illinois at Chicago during the 2003–04 NCAA Division I men's basketball season.

The Flames, led by head coach Jimmy Collins, played their home games at the UIC Pavilion in Chicago, Illinois as members of the Horizon League.

UIC finished the regular season in second place at 12–4.

They went on to win the Horizon League tournament, and received the conference's automatic bid to the NCAA tournament.

13 seed in the St. Louis region, UIC was beaten by No.