1978 BYU Cougars football team

The 1978 BYU Cougars football team represented the Brigham Young University (BYU) in the 1978 NCAA Division I-A football season as a member of the Western Athletic Conference (WAC). The team was led by head coach LaVell Edwards, in his seventh year, and played their home games at Cougar Stadium in Provo, Utah. They finished the season with a record of nine wins and four losses (9–4, 5–1 WAC), as WAC Champions and with a loss against Navy in the Holiday Bowl.