The Seattle SuperSonics (commonly shortened to Sonics) 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 it now plays as the Oklahoma City Thunder.

Sam Schulman owned the team from its 1967 inception until 1983. It was then owned by Barry Ackerley until 2001, when it came under ownership of Basketball Club of Seattle, headed by Starbucks chairman emeritus, former president and CEO Howard Schultz. On July 18, 2006, Basketball Club of Seattle sold the SuperSonics and its Women's National Basketball Association (WNBA) sister franchise, the Seattle Storm to Professional Basketball Club LLC, headed by Oklahoma City businessman Clay Bennett. The NBA Board of Governors approved the sale on October 24, 2006, and finalized it seven days later, at which point the new ownership group took control. After failing to find public funding to construct a new arena in the Seattle area, the SuperSonics moved to Oklahoma City before the 2008–09 season, following a $45 million settlement with the city of Seattle to pay off their existing lease at the KeyArena at Seattle Center before it expired in 2010.

The SuperSonics played their home games at KeyArena (originally the Seattle Center Coliseum) for 33 of the franchise's 41 seasons in Seattle. In 1978, the team moved to the Kingdome, which they shared with Major League Baseball (MLB) team Seattle Mariners and National Football League (NFL) team Seattle Seahawks. The team returned to the Coliseum in 1985, and temporarily moved to the Tacoma Dome for the 1994–95 season while the Coliseum was renovated and renamed KeyArena.

The SuperSonics won the NBA championship in 1979. The franchise won Western Conference titles in 1978, 1979 and 1996; and six divisional titles—their last being in 2005—five in the Pacific Division and one in the Northwest Division. The franchise attained a 1,745–1,585 (.524) regular season win–loss record, as well as a 107–110 (.493) playoff win–loss record during its time in Seattle. Both marks would rank in the top half of the NBA's all-time standings. Settlement terms of a lawsuit between the city of Seattle and Clay Bennett's ownership group stipulated SuperSonics' banners, trophies and retired jerseys remain in Seattle; the nickname, logo and color scheme are available to any subsequent NBA team that plays in Seattle subject to NBA approval.

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