Jack Wayne Sikma (born November 14, 1955) is an American retired basketball center. He was a seven-time NBA All-Star with the Seattle SuperSonics, who drafted him in the first round with the eighth overall pick of the 1977 NBA draft. In 1979, he won an NBA championship with Seattle. Sikma finished his playing career with the Milwaukee Bucks. He was elected to the Naismith Basketball Hall of Fame in 2019.