The 1999 SummerSlam was the 12th annual SummerSlam professional wrestling pay-per-view (PPV) event produced by the World Wrestling Federation. It took place on August 22, 1999, at the Target Center in Minneapolis, Minnesota. Nine matches were contested at the event.

SummerSlam is a professional wrestling event, produced annually since 1988 by the world's largest professional wrestling promotion, WWE. Dubbed "The Biggest Party of the Summer", it is considered WWE's second biggest event of the year behind their flagship event, WrestleMania. It is also considered one of the company's five biggest events of the year, along with WrestleMania, Royal Rumble, Survivor Series, and Money in the Bank, referred to as the "Big Five". The event has been broadcast on pay-per-view (PPV) since the inaugural 1988 event and via livestreaming since the 2014 event.