SummerSlam (2017) was a professional wrestling pay-per-view (PPV) event and WWE Network event produced by WWE for the Raw and SmackDown brands. It took place on August 20, 2017, at Barclays Center in Brooklyn, New York. It was the thirtieth event under the SummerSlam chronology.
Thirteen matches were contested at the event, including three on the pre-show. The event featured eight championship matches, the most for a SummerSlam event, where five of the titles changed hands. In the main event, Brock Lesnar defeated Braun Strowman, Roman Reigns, and Samoa Joe in a fatal four-way match to retain the Universal Championship and in the penultimate match, Jinder Mahal defeated Shinsuke Nakamura to retain the WWE Championship. On the undercard, AJ Styles defeated Kevin Owens to retain the United States Championship in a match that featured Shane McMahon as the special guest referee, and Dean Ambrose and Seth Rollins defeated Cesaro and Sheamus to win the Raw Tag Team Championship.