The 2003 Idaho State Bengals football team represented Idaho State University as a member of the Big Sky Conference during the 2003 NCAA Division I-AA football season. Led by fifth-year head coach Larry Lewis, the Bengals compiled an overall record of 8–4, with a mark of 4–3 in conference play, and finished tied for fourth in the Big Sky. The team played home games at Holt Arena in Pocatello, Idaho.
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