The 2025 BYU Cougars football team represented Brigham Young University (BYU) as a member of the Big 12 Conference during the 2025 NCAA Division I FBS football season. The Cougars were led by tenth-year head coach Kalani Sitake and play their home games at LaVell Edwards Stadium. With a loss by Arizona State on November 28, the Cougars clinched a berth in the Big 12 Championship Game, their first appearance in the Big XII championship game in program history, where they were defeated by Texas Tech.
The BYU Cougars drew an average home attendance of 63,789, the highest of all American football teams from Utah.
Twenty BYU players earned All-Big 12 awards for the season, including four First Team appointments (running back LJ Martin, center Bruce Mitchell, linebacker Jack Kelly, and safety Tanner Wall), and Martin being named Offensive Player of the Year and quarterback Bear Bachmeier being named Offensive Freshman of the Year. Additionally, head coach Kalani Sitake was named the conference's Coach of the Year.