Night of Champions (2015) was a professional wrestling pay-per-view (PPV) event produced by WWE. It took place on September 20, 2015 at Toyota Center in Houston, Texas. It was the ninth and final event under the Night of Champions chronology. This was the second Night of Champions event to be held in Houston, after Vengeance: Night of Champions in 2007.

Eight matches were contested at the event, with one match on the pre-show. In the main event, Seth Rollins defeated Sting to retain the WWE World Heavyweight Championship. The event, which included Sting's sole PPV main event and title match in WWE, generated 77,000 buys (up from the previous year's 48,000). The match would be the last of Sting's career.

The professional wrestling matches at Night of Champions featured professional wrestlers performing as characters in scripted events pre-determined by the hosting promotion, WWE. Storylines between the characters played out on WWE's primary television programs, Raw and SmackDown.

At SummerSlam, Seth Rollins defeated John Cena to retain the WWE World Heavyweight Championship and win Cena's United States Championship. On the August 24 episode of Raw, The Authority attempted to present Rollins with a statue for winning, but instead Sting made his return to the WWE for the first time since the night after WrestleMania 31 and attacked Rollins, challenging Rollins for the WWE World Heavyweight Championship by raising it over his head.Triple H then scheduled Rollins to defend the WWE World title against Sting at Night of Champions. On the August 31 edition of Raw, Cena invoked his rematch clause to face Rollins for the United States Championship at Night of Champions.

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