1998–99 George Mason Patriots men's basketball team

The 1998–99 George Mason Patriots Men's basketball team represents George Mason University during the 1998–99 NCAA Division I men's basketball season. This was the 33rd season for the program, the second under head coach Jim Larrañaga. The Patriots played their home games at the Patriot Center in Fairfax, Virginia.

Honors and awards
Colonial Athletic Association Player of the Year
 * George Evans

Colonial Athletic Association All-Conference Team
 * George Evans
 * Jason Miskiri

Colonial Athletic Association Defensive Player of the Year
 * George Evans

Colonial Athletic Association Coach of the Year
 * Jim Larrañaga

Schedule and results
!colspan=12 style=| Non-conference regular season

!colspan=12 style=|CAA regular season

!colspan=12 style=|1999 CAA tournament

!colspan=12 style=|1999 NCAA tournament