| Sport: | football |
| Year: | 2003 |
| Team: | Illinois Fighting Illini |
| Conference: | Big Ten Conference |
| Short Conf: | Big Ten |
| Record: | 1–11 |
| Conf Record: | 0–8 |
| Hc Year: | 7th |
| Off Coach: | Ron Turner |
| Oc Year: | 5th |
| Def Coach: | Mike Cassity |
| Dc Year: | 3rd |
The 2003 Illinois Fighting Illini football team represented the University of Illinois at Urbana–Champaign in the 2003 NCAA Division I-A football season. They participated as members of the Big Ten Conference. Their home games were played at Memorial Stadium in Champaign, Illinois. The team's head coach was Ron Turner, who was in his seventh season with the Illini. Illinois had a record of 1–11.