SummerSlam 1999 was the twelfth annual SummerSlam professional wrestling pay-per-view event produced by the World Wrestling Federation (WWF). It took place on August 22, 1999 at the Target Center in Minneapolis, Minnesota. The main event was a Triple Threat match for the WWF Championship involving champion "Stone Cold" Steve Austin, Triple H, and Mankind. Mankind won the match to win the title.