The 1983–84 BYU Cougars men's basketball team represented Brigham Young University as a member of the Western Athletic Conference during the 1983–84 basketball season.

Led by head coach LaDell Andersen, the Cougars compiled a record of 20–11 (12–4 WAC) to finish second in the WAC regular season standings.

The team played their home games at the Marriott Center in Provo, Utah.

The Cougars received an at-large bid to the NCAA tournament as No.

In the opening round, BYU defeated UAB before losing to No.