The 2005 Utah State Aggies football team represented Utah State University as a member of the Western Athletic Conference (WAC) in 2005 NCAA Division I-A football season.

The Aggies were led by first-year head coach Brent Guy and played their home games in Romney Stadium in Logan, Utah.

[1] The Aggies finished the season 3–8 overall and 2–6 in WAC play to tie for sixth place.

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