The 1990 Great American Bash was the second annual Great American Bash professional wrestling pay-per-view (PPV) event produced by World Championship Wrestling (WCW) under the National Wrestling Alliance (NWA) banner, and the sixth annual Great American Bash event overall. It was the final held under the NWA banner, as WCW seceded from the NWA in January 1991. The event took place on July 7, 1990, at the Baltimore Arena in Baltimore, Maryland. This was the third Great American Bash held at this venue after the 1988 and 1989 events. The 1990 event featured the WCW debut of Big Van Vader.

In the main event, Ric Flair defended the NWA World Heavyweight Championship against Sting. Sting pinned Flair after countering his Figure Four Leglock attempt into a small package. During the match, The Steiner Brothers, Paul Orndorff, and The Junkyard Dog (the "Dudes with Attitudes") surrounded the ring to prevent outside interference by The Four Horsemen. During the entirety of the match, Ole Anderson was handcuffed to El Gigante.

The 1990 Great American Bash would be the final Great American Bash held under the NWA banner, as WCW seceded from the NWA in January 1991.^[1]

This would be Mark Callous' final appearance on a WCW PPV, after allegedly being told by booker Ole Anderson he would not draw well. Callous would head to the WWF where he would become the legendary Undertaker.

Harley Race would wrestle only house shows until retiring from active wrestling in December 1990. He wouldn't return until next year's Great American Bash.

Sting would hold the NWA World Heavyweight title through the remainder of 1990, shortly after the GAB a mysterious wrestler allegedly from Sting's past would begin haunting him under the name "The Black Scorpion".

• 1990 in professional wrestling