2002–03 BYU Cougars men's basketball team

The 2002–03 BYU Cougars men's basketball team represented Brigham Young University as a member of the Mountain West Conference during the 2002–03 season. Led by head coach Steve Cleveland, the Cougars earned their first Mountain West Conference championship. This was also their second of three NCAA Tournament appearances under Cleveland. BYU finished the season with a 23–9 record (11–3 MWC).

Schedule and results
!colspan=9 style=| Regular Season

!colspan=9 style=| WAC tournament

!colspan=9 style=| NCAA tournament