The 2015 Hell in a Cell was the seventh annual Hell in a Cell professional wrestling pay-per-view (PPV) and livestreaming event produced by WWE. It took place on October 25, 2015, at Staples Center in Los Angeles, California. This was the first WWE pay-per-view, other than SummerSlam, to be held in the city of Los Angeles since No Way Out in February 2007. This was also the last Hell in a Cell event to be held before the reintroduction of the brand extension in July 2016.

Eight matches were contested at the event, including one on the Kickoff pre-show. In the main event, Brock Lesnar defeated The Undertaker in a Hell in a Cell match, their second match against each other in a Hell in a Cell match, the first one being at No Mercy in October 2002. In the opening bout, Alberto Del Rio, who last wrestled for WWE in 2014, returned to answer John Cena's open challenge and defeat him to win the WWE United States Championship.