In 2000, Mason was traded to the Miami Heat along with Eddie Jones, Ricky Davis and Dale Ellis for Jamal Mashburn, P. J. Brown, Tim James, Rodney Buford and Otis Thorpe In Miami, although Mason had been brought over by Miami coach Pat Riley to be a role player on what was thought to have been a contender Heat team, the kidney ailment of Alonzo Mourning forced Mourning to sit out and made Mason a starter for the team. Mason would respond by finishing second on the team in scoring, with 16.1 points per game, and averaging 9.6 rebounds. With Mourning and Grant Hill selected but unable to play due to injury in the 2001 NBA All-Star Game, Mason was chosen to represent the Heat in his only selection to an All-Star team. Mason helped the Heat make the playoffs with a 50 win season for the injury-ravaged squad. Mason, however, virtually disappeared in the playoffs, taking only 13 shots and averaging a mere 5.3 points and 3 rebounds in three games. Mason was waived during the offseason.