The August 12, 1999 Edition of WCW Thunder is a Professional wrestling television show of World Championship Wrestling's, which took place on August 5, 1999 at the La Crosse Center in La Crosse, Wisconsin.
- Numbers in parentheses indicate the length of the match.
- (c) refers to the champion(s) heading into the match.
- Rick Steiner defeated Spyder
- Sid Vicious defeated Disorderly Conduct (Mean Mike & Tough Tom) in a handicap match
- Shane Douglas & Dean Malenko defeated Barry Windham & Bobby Duncum, Jr.
- Evan Karagias defeated Randy Savage via disqualification