| Year: | 1998 |
| Team: | Northwestern State Demons |
| Sport: | football |
| Conference: | Southland Conference |
| Short Conf: | Southland |
| Tsnrank: | 3 |
| Record: | 11–3 |
| Conf Record: | 6–1 |
| Head Coach: | Sam Goodwin |
| Hc Year: | 16th |
| Def Coach: | Bradley Dale Peveto |
| Dc Year: | 3rd |
| Stadium: | Harry Turpin Stadium |
| Champion: | Southland champion |
| Bowl Result: | L 31–41 vs. UMass |
The 1998 Northwestern State Demons football team represented Northwestern State University as a member of the Southland Conference during the 1998 NCAA Division I-AA football season. Led by 16th-year head coach Sam Goodwin, the Demons compiled an overall record of 11–3 with a mark of 6–1 in conference play, winning the Southland title. Northwestern State advanced to the NCAA Division I-AA Football Championship playoffs, where the Demons beat Illinois State in the first round and Appalachian State in the quarterfinals before losing to the eventual national champion, UMass in the semifinals. The team played home games at Harry Turpin Stadium in Natchitoches, Louisiana.