Gregory Darnell Smith (born January 28, 1947) is an American retired basketball player.
Smith was born in Princeton, Kentucky and played college basketball at Western Kentucky University and was drafted by the Kentucky Colonels in the 1968 American Basketball Association draft and by the Milwaukee Bucks in the fourth round of the 1968 NBA draft.
Smith played forward for the Milwaukee Bucks (1968–72), Houston Rockets (1972) and Portland Trail Blazers (1972–76).
He helped the Bucks win the 1970–71 NBA Championship and the 1971–72 NBA Midwest Division.
In 8 seasons Smith played in 524 games and had 12,269 minutes played. He had a .482 field goal percentage (1,737 for 3,607), and a .646 free throw percentage (623 for 965). He recorded 3,249 total rebounds, 969 assists, 1,553 personal fouls and 4,097 points.