The 2009 Backlash was the 11th Backlash professional wrestling pay-per-view (PPV) event produced by World Wrestling Entertainment (WWE). It was held for wrestlers from the promotion's Raw, SmackDown, and ECW brand divisions. The event took place on April 26, 2009, at the Dunkin' Donuts Center in Providence, Rhode Island. It was the final Backlash held until 2016, as in 2010, Backlash was replaced by Extreme Rules. The concept of the pay-per-view was based around the backlash from WrestleMania 25—despite the event's revival in 2016, the 2009 event would be the final Backlash to carry the post-WrestleMania theme until the 2021 event.

The card comprised seven matches. The main matches saw Edge defeating World Heavyweight Champion John Cena in a Last Man Standing match to win the title and Randy Orton won the WWE Championship in a six-man tag team match pitting defending champion Triple H, Batista, and Shane McMahon against The Legacy (Orton, Cody Rhodes, and Ted DiBiase); Orton pinned Triple H to win the title. The card also included Jeff Hardy defeating Matt Hardy in an "I Quit" match and Christian winning the ECW Championship by defeating Jack Swagger. The event received 182,000 buys, down on the previous event figure of 200,000 buys.