The 1998 Montana State Bobcats football team was an American football team that represented Montana State University in the Big Sky Conference (Big Sky) during the 1998 NCAA Division I-AA football season. In their fifth season under head coach Cliff Hysell, the Bobcats compiled a 7–4 record (5–3 against Big Sky opponents), tied for second place in the Big Sky, and were ranked No. 25 in the final I-AA poll by The Sports Network (wire service).