The 1923 Illinois Fighting Illini football team was an American football team that represented the University of Illinois during the 1923 Big Ten Conference football season. In their 11th season under head coach Robert Zuppke, the Fighting Illini compiled an 8–0 record (5–0 against Big Ten Conference opponents), tied with Michigan for the Big Ten championship, shut out five of eight opponents, and outscored their opponents by a total of 136 to 20. Grange and Guard Jim McMillen were consensus first-team picks on the 1923 All-America college football team. McMillen was also the team captain.