The 2018 Hell in a Cell was the 10th annual Hell in a Cell 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 September 16, 2018, at the AT&T Center in San Antonio, Texas. Previously, Hell in a Cell was held annually in October, thus the 2018 event was the first to not have occurred during that month. The event returned to the October slot the following year, but in 2021, the event series was moved up to June.

Eight matches were contested at the event, including one on the Kickoff pre-show. The main event, which was Raw's Universal Championship Hell in a Cell match between defending champion Roman Reigns and Braun Strowman with special guest referee Mick Foley, ended in a no-contest after Brock Lesnar returned and attacked both men, rendering them unable to continue. This was also Strowman's Money in the Bank cash-in match that was scheduled in advance. In the other Hell in a Cell match, which was the opening bout, Randy Orton defeated Jeff Hardy. In other prominent matches, AJ Styles controversially retained SmackDown's WWE Championship against Samoa Joe, Becky Lynch defeated Charlotte Flair to win the SmackDown Women's Championship, and Ronda Rousey defeated Alexa Bliss to retain the Raw Women's Championship.