The 1984 BYU Cougars football team represented Brigham Young University (BYU) in the 1984 NCAA Division I-A football season. The Cougars were led by 13th-year head coach LaVell Edwards and played their home games at Cougar Stadium in Provo, Utah. The team competed as a member of the Western Athletic Conference, winning the conference for the ninth consecutive year. The Cougars finished the regular season as the only undefeated team in Division I-A, and secured their first ever national title by defeating Michigan in the 1984 Holiday Bowl.