The 2004 Northwestern State Demons football team represented Northwestern State University as a member of the Southland Conference during the 2004 NCAA Division I-AA football season.
Led by third-year head coach Scott Stoker, the Demons compiled an overall record of 8–4 with a mark of 4–1 in conference play, and finished as Southland co-champion with Sam Houston State.
Northwestern advanced to the Division I-AA playoffs before losing to Montana.
Northwestern State played home games at Harry Turpin Stadium in Natchitoches, Louisiana.
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