Gus Williams is an American former professional basketball player in the National Basketball Association (NBA). Nicknamed "the Wizard", he played for the Seattle SuperSonics, winning an NBA championship in 1979. He also played for the Golden State Warriors, Washington Bullets and Atlanta Hawks.

The Seattle SuperSonics were an American professional basketball team based in Seattle. The SuperSonics competed in the National Basketball Association (NBA) as a member of the Western Division (1967–1970), and later as a member of the Western Conference's Pacific (1970–2004) and Northwest (2004–2008) divisions. After the 2007–08 season ended, the team relocated to Oklahoma City, where they now play as the Oklahoma City Thunder.