The 1999 Great American Bash was the ninth Great American Bash professional wrestling pay-per-view (PPV) event produced by World Championship Wrestling (WCW), and 13th Great American Bash event overall. It took place on June 13, 1999, at the Baltimore Arena in Baltimore, Maryland. This was the seventh Great American Bash held at this venue after the 1988, 1989, 1990, 1991, 1996, and 1998 events. This was also the first PPV event to incorporate WCW's new logo, which had debuted two months prior.

Nine matches were contested at the event. In the main event, Kevin Nash retained his WCW World Heavyweight Championship against Randy Savage by disqualification. In other prominent matches, The Jersey Triad (Diamond Dallas Page and Chris Kanyon) defeated Chris Benoit and Perry Saturn to win the WCW World Tag Team Championship, Rick Steiner defeated Sting in a falls count anywhere match, and Ric Flair defeated Roddy Piper by disqualification to regain the presidency of WCW. The event also marked the WCW return of Sid Vicious.