The 1999 Slamboree was the seventh Slamboree professional wrestling pay-per-view (PPV) event produced by World Championship Wrestling (WCW). It took place on May 9, 1999 from the TWA Dome in St. Louis, Missouri. This was the last WCW PPV to be promoted with the classic logo. As of 2014 the event is available on the WWE Network.

Ten matches were contested at the event, including one dark match. The main event saw Kevin Nash defeat Diamond Dallas Page to win the WCW World Heavyweight Championship. In other prominent matches, Roddy Piper defeated Ric Flair by disqualification to become President of WCW, Gorgeous George defeated Charles Robinson to reinstate Randy Savage as a WCW wrestler, Rick Steiner defeated Booker T to win the WCW World Television Championship, and in the opening bout, Raven and Perry Saturn won a triple threat match to win the WCW World Tag Team Championship.