The 2007 No Mercy was the 10th No Mercy 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 October 7, 2007, at the Allstate Arena in the Chicago suburb of Rosemont, Illinois.

Nine professional wrestling matches were scheduled on the event's supercard. The scheduled main event from the Raw brand was supposed to be WWE Champion John Cena defending his title against challenger Randy Orton in a Last Man Standing match; however, on the October 1 episode of Raw, Cena legitimately tore his right pectoral muscle, and the match and the title were canceled and vacated, respectively. As a result the main event turned into three matches as Triple H competed in all those three matches that night for the WWE Championship, where he first defeated the newly-crowned champion Randy Orton (Orton was awarded the title by Mr. McMahon in the beginning of the show), later defeated Umaga to retain the title, and then, on the last match of the card, he lost his title back to Orton in a Last Man Standing match. The predominant match from the SmackDown! brand had World Heavyweight Champion Batista defeating challenger The Great Khali in a Punjabi Prison match. The primary match from the ECW brand was ECW Champion CM Punk defeating challenger Big Daddy V by disqualification. Also on the undercard, Finlay and Rey Mysterio fought to a no contest.

The 2007 No Mercy event had an approximate attendance of 12,500 and received approximately 271,000 pay-per-view buys. This event helped WWE obtain a pay-per-view revenue of $19.9 million. When the event was released on DVD, it reached a peak position of nineteenth on Billboard's DVD Sales Chart.