The 1984 Idaho Vandals football team represented the University of Idaho in the 1984 NCAA Division I-AA football season. The Vandals, led by third-year head coach Dennis Erickson, were members of the Big Sky Conference and played their home games at the Kibbie Dome, an indoor facility on campus in Moscow, Idaho. Although the 1984 season was less successful than the previous two, it marked the first time in nearly eight decades that the Vandals had three consecutive winning seasons in football; it was last accomplished in 1905.