| 2004 NIFL season | |
|---|---|
| League | National Indoor Football League |
| Sport | indoor American football |
| Regular season | |
| Season champions | Ohio Valley Greyhounds |
| Playoffs | |
| Atlantic champions | Lexington Horsemen |
| Atlantic runners-up | Ohio Valley Greyhounds |
| Pacific champions | Sioux Falls Storm |
| Pacific runners-up | Billings Outlaws |
| Indoor Bowl IV | |
| Champions | Lexington Horsemen |
| Runners-up | Sioux Falls Storm |
The 2004 National Indoor Football League season was the fourth season of the National Indoor Football League (NIFL). The league champions were the Lexington Horsemen, who defeated the Sioux Falls Storm in Indoor Bowl IV.