The 2002 No Mercy was the fifth No Mercy professional wrestling pay-per-view (PPV) event produced by World Wrestling Entertainment (WWE). It was held for wrestlers from the promotion's Raw and SmackDown! brand divisions. The event took place on October 20, 2002, at the Alltel Arena in North Little Rock, Arkansas. It was the first No Mercy held following the introduction of the brand extension, as well as the first No Mercy held under the WWE name after the promotion was renamed from World Wrestling Federation (WWF) to WWE in May.

The event featured two main events. The main event from the SmackDown! brand featured WWE Champion Brock Lesnar defeat The Undertaker in a Hell in a Cell match to retain the title. The main event from the Raw brand was a title unification match, where World Heavyweight Champion Triple H defeated WWE Intercontinental Champion Kane to unify the Intercontinental Championship into the World Heavyweight Championship.

The undercard featured Kurt Angle and Chris Benoit versus Edge and Rey Mysterio to determine the inaugural WWE Tag Team Champions. Other matches included Trish Stratus versus Victoria for the WWE Women's Championship, Jamie Noble versus Tajiri for the WWE Cruiserweight Championship, Rob Van Dam versus Ric Flair, Torrie Wilson versus Dawn Marie, and Chris Jericho and Christian versus Booker T and Goldust for the World Tag Team Championship.