SummerSlam (2004) was a professional wrestling pay-per-view show made by World Wrestling Entertainment (WWE). It was held on August 15, 2004 at Air Canada Centre in Toronto, Ontario. It was the seventeenth SummerSlam event held by the WWE.
The main match for the Raw brand saw Randy Orton defeat Chris Benoit to win the World Heavyweight Championship. Orton won the match by pinfall after he performed an RKO on Benoit. By winning the championship, Orton became the youngest World Heavyweight Champion in WWE history. The main match for the SmackDown! brand was a match between John "Bradshaw" Layfield and The Undertaker for the WWE Championship. JBL won the match by disqualification after The Undertaker hit him with the championship.