The 1989 Illinois State Redbirds football team represented Illinois State University as a member of the Gateway Collegiate Athletic Conference (GCAC) during the 1989 NCAA Division I-AA football season. In their second year under head coach Jim Heacock, the Redbirds compiled an overall record of 5–6, with a mark of 4–2 in conference play, and finished tied for second in the GCAC. Illinois State played home games at Hancock Stadium in Normal, Illinois.
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