The 2005 Montana State Bobcats football team was an American football team that represented Montana State University in the Big Sky Conference during the 2005 NCAA Division I-AA football season. In their sixth season under head coach Mike Kramer, the Bobcats compiled a 7–4 record (5–2 against Big Sky opponents), finished in a three-way tie for the Big Sky championship with Eastern Washington and Montana, but did not received a bid to the NCAA Division I-AA Football Championship playoffs. Montana State ranked No. 18 in final I-AA poll by The Sports Network.