White, a 6-foot-8 forward, was the No. 2 available graduate transfer in ESPN's rankings.
White averaged 10.2 points and 8.8 rebounds per game for Arizona State last season. He was second in the Pac-12 in rebounding and led the team with 35 blocked shots.
He started 92 of his 95 games over the past three seasons, averaging 9.8 points and 7.0 rebounds. He shot 60.5% from the floor, second on Arizona State's career list.
White is the second graduate transfer the Rebels have added for next season. He joins former Rider guard Dimencio Vaughn.