The 2004 Great American Bash was the first annual Great American Bash professional wrestling pay-per-view (PPV) event produced by World Wrestling Entertainment (WWE), and 15th Great American Bash event overall. It was held exclusively for wrestlers from the promotion's SmackDown! brand division. The event took place on June 27, 2004, at the Norfolk Scope in Norfolk, Virginia. The Great American Bash was previously promoted by World Championship Wrestling (WCW), which WWE acquired in 2001, thus the 2004 event was the first Great American Bash held since 2000. The 2004 event grossed $325,000 with 6,500 ticket sales and received a 0.47 buyrate.

Three of the eight matches on the card were contested for a championship; one was lost while the other two were retained. The main event was a Handicap match between The Dudley Boyz (Bubba Ray Dudley and D-Von Dudley) and The Undertaker. Undertaker won the match after pinning D-Von following a Tombstone piledriver. One of the featured matches on the undercard was a Texas Bullrope match for the WWE Championship between John "Bradshaw" Layfield (JBL) and champion Eddie Guerrero. JBL won the match and the WWE Championship after touching all four turnbuckles in succession. Guerrero was at first declared the winner, but General manager Kurt Angle came out and showed that JBL had touched the final turnbuckle before Guerrero. Another primary match on the undercard was Rey Mysterio versus Chavo Guerrero for the WWE Cruiserweight Championship, which Mysterio won with a sunset flip.