| Year: | 1998 |
| Team: | Colorado State Rams |
| Sport: | football |
| Conference: | Western Athletic Conference |
| Division: | Mountain Division |
| Short Conf: | WAC |
| Record: | 8–4 |
| Conf Record: | 5–3 |
| Head Coach: | Sonny Lubick |
| Hc Year: | 6th |
| Off Coach: | Steve Fairchild |
| Oc Year: | 2nd |
| Def Coach: | Larry Kerr |
| Dc Year: | 6th |
| Stadium: | Hughes Stadium |
The 1998 Colorado State Rams football team represented Colorado State University as a member of the Mountain Division of the Western Athletic Conference (WAC) during 1998 NCAA Division I-A football season. Led by sixth-year head coach Sonny Lubick, the Rams compiled an overall record of 8–4 with a mark of 5–3 in conference play, placing third in the WAC's Mountain Division. The team played home games at Hughes Stadium in Fort Collins, Colorado. This season was Colorado State's last in the WAC before joining the newly formed Mountain West Conference in 1999.
See also: 1998 NCAA Division I-A football rankings.