The 2017 SummerSlam was the 30th annual SummerSlam professional wrestling pay-per-view (PPV) and livestreaming event produced by WWE. It was held for wrestlers from the promotion's Raw and SmackDown brand divisions. The event took place on August 20, 2017, at Barclays Center in Brooklyn, New York for the third consecutive year.

Thirteen matches were contested at the event, including three on the Kickoff 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 Raw's Universal Championship and in the penultimate match, Jinder Mahal defeated Shinsuke Nakamura to retain SmackDown's WWE Championship. In other prominent matches, AJ Styles defeated Kevin Owens to retain SmackDown's United States Championship in a match that featured Shane McMahon as the special guest referee, Dean Ambrose and Seth Rollins defeated Cesaro and Sheamus to win the Raw Tag Team Championship, and Sasha Banks defeated Alexa Bliss to win her record-tying fourth Raw Women's Championship.