Sylvester "Sly" Williams (born January 26, 1958) is a retired American basketball player. Born in New Haven, Connecticut, he played parts of seven seasons in the NBA with the New York Knicks, Atlanta Hawks and Boston Celtics, appearing in 305 regular season games and seven in the playoffs. In August 2002 he pleaded guilty to kidnapping charges after allegedly holding a woman captive for about 24 hours and threatening her with a knife in September 2001, and raping a second woman in January 2002. The cases were consolidated and Williams was charged with first-degree rape, sodomy and first-degree kidnapping. He was sentenced to up to five years in prison. Williams was working for a pipe and plastics company at the time of his arrest.