The 2008 Great American Bash was the fifth annual Great American Bash professional wrestling pay-per-view (PPV) event produced by World Wrestling Entertainment (WWE), and 19th Great American Bash event overall. It was held for wrestlers from the promotion's Raw, SmackDown, and ECW brand divisions. The event took place on July 20, 2008, at the Nassau Veterans Memorial Coliseum in Uniondale, New York. It was the final Great American Bash PPV to be held under the full name of "The Great American Bash", as in 2009, the event's title was truncated to The Bash. It was the final PPV of the Ruthless Aggression Era, as WWE programming became PG two days after the event. As such, it was also the final WWE PPV to have a TV Parental Guidelines rating of TV-14 until The Horror Show at Extreme Rules in 2020.

The main match on the SmackDown brand was between Triple H and Edge for the WWE Championship. Triple H won the match and retained the WWE Championship after pinning Edge following a Pedigree. The primary match on the Raw brand was between CM Punk and Batista for the World Heavyweight Championship, which ended in a double disqualification following interference from Kane. The predominant match on the ECW brand was between Mark Henry and Tommy Dreamer for the ECW Championship, which Henry won by pinfall due to the interference and heel turn of Colin Delaney, with Henry proceeding to perform a World's Strongest Slam to retain the championship. The featured matches on the undercard included John Cena versus John "Bradshaw" Layfield (JBL) in a New York City Parking Lot Brawl and Shawn Michaels versus Chris Jericho. The event also crowned the first WWE Divas Champion.