Calvin Anthony Duncan (born March 21, 1961) is an American pastor and former professional basketball player.

[1] He was drafted in the 1985 NBA draft in the 2nd round with the 30th overall pick by the Cleveland Cavaliers, then was traded by the Cleveland Cavaliers with Charles Oakley to the Chicago Bulls for Keith Lee and Ennis Whatley, but instead of signing, he joined Athletes in Action, an evangelical Christian traveling team.

[2] During the 1980–81 season, Duncan set the all-time record for points in a game for Oak Hill Academy with 61.

[5] Duncan's mother died in childbirth and, with no knowledge of his father, was raised by his aunt in Linden, New Jersey.

He transferred to Oak Hill Academy after his junior year at Linden High School, hoping to earn the grades that would be necessary to play Division I basketball.