The 2002–03 Illinois State Redbirds men's basketball team represented Illinois State University during the 2002–03 NCAA Division I men's basketball season.

The Redbirds, led by fourth year head coach Tom Richardson, played their home games at Redbird Arena and competed as a member of the Missouri Valley Conference.

They finished the season 8–21, 5–13 in conference play to finish in a tie for eighth place.

They were the number nine seed for the Missouri Valley Conference tournament.

They were victorious over Drake University in their opening round game but were defeated by Southern Illinois University in their quarterfinal game.