SummerSlam (2015) was a professional wrestling pay-per-view (PPV) event produced by WWE. It took place on August 23, 2015, at Barclays Center in Brooklyn, New York. The twenty-eighth event under the SummerSlam chronology, this was the first since 2008 to be held outside of Los Angeles as Staples Center was the exclusive home for SummerSlam from 2009 to 2014, and the eighth SummerSlam to be held in the New York metropolitan area. The Izod Center was originally supposed to host SummerSlam, but due to its closure in April 2015, the event was moved to Barclays Center. The event was the first in the SummerSlam chronology to be four hours in length, a length previously reserved only for WrestleMania.

The event was the second night of what was billed as a "triple-header" at Barclays Center, with NXT TakeOver: Brooklyn having taken place the previous night, and Raw the following night. Ten matches were contested at the event, with no pre-show. In the main event, The Undertaker defeated Brock Lesnar in controversial fashion; Lesnar put Undertaker in his Kimura lock and the timekeeper rang the bell after seeing the Undertaker supposedly indicating submission; since the referee hadn't seen a submission and never stopped the match, the match continued. The confusion allowed Undertaker to surprise Lesnar with a low blow before trapping him in the Hell's Gate submission hold, in which Lesnar passed out and gave Undertaker the win.

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