Billy Knight, American basketball player
William R. Knight (born June 9, 1952) is an American former professional basketball player and executive. Playing with the Indiana Pacers in both the American Basketball Association (ABA) and later the National Basketball Association (NBA), he was both an ABA and NBA All-Star. He played college basketball with the Pittsburgh Panthers, who retired his No. 34.

In college, Knight was a consensus second-team All-American in 1974. He began his pro career with Indiana, earning ABA All-Rookie First Team honors in 1975. He continued with the Pacers in the NBA, and he also played in the league for the Buffalo Braves, Boston Celtics, Kansas City Kings and San Antonio Spurs. Knight finished his playing career with a season in France. He became an executive with the Pacers and the Vancouver/Memphis Grizzlies. He last served as the executive vice president and general manager of the Atlanta Hawks from 2003 to 2008.