William Campion is a retired American basketball player. He stands 6 ft 9 in (2.06 m) and played the center position in college and professionally. Campion is best known for his career at Manhattan College. Before graduating in 1975, in just over 2½ seasons, he set the still-standing school rebounds records for a game (30), season (419), and career (1,070). He also scored 1,223 points to give him a 1,000-point/rebound mark for his career. After his junior season he was given the Haggerty Award, an annual award that goes to the best male collegiate basketball player in the greater New York City area. Campion was selected in the fourth round in the 1975 NBA draft by the Milwaukee Bucks. The American Basketball Association's Virginia Squires also chose him that year, but Campion did not play in either league.