Grant Dean Williams (born November 30, 1998) is an American professional basketball player for the Boston Celtics of the National Basketball Association (NBA).
He played college basketball for the Tennessee Volunteers.
A 6'7"power forward from Charlotte, North Carolina, he was drafted 22nd overall in the 2019 NBA Draft.
Williams was an All-Southeastern Conference player as a freshman, sophomore, and junior.
He was awarded back-to-back SEC Player of the Year honors for the 2017–18 and 2018–19 seasons, becoming the first player to do so since Corliss Williamson in 1995.
He led Tennessee to a #3-seed in the 2018 NCAA Tournament and #2-seed in the 2019 NCAA Tournament.