The 2002 SummerSlam was the 15th annual SummerSlam 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 August 25, 2002, at the Nassau Veterans Memorial Coliseum in Uniondale, New York. With this event, SummerSlam became the first pay-per-view to have events in the three major indoor venues in the New York metropolitan area. Madison Square Garden hosted the event in 1988, 1991, and 1998, and the Izod Center in East Rutherford, New Jersey hosted the event in 1989, 1997, and later in 2007. This was also the first SummerSlam held under the WWE name, after the promotion was renamed from World Wrestling Federation (WWF) to WWE in May, and the first SummerSlam held following the introduction of the brand extension in March.

The main match on the SmackDown! brand was for the WWE Undisputed Championship between The Rock and Brock Lesnar. Lesnar won the match and the championship after pinning Rock following an F-5. The main match on the Raw brand featured an Unsanctioned Street Fight between the returning Shawn Michaels and Triple H, which Michaels won after pinning Triple H by reversing Triple H's Pedigree attempt into a jackknife roll-up. There was also an interpromotional match for the Intercontinental Championship between Rob Van Dam from Raw and Chris Benoit from SmackDown!, which Van Dam won by pinfall after performing a Five-Star Frog Splash. The other matches on the undercard included The Undertaker versus Test and Kurt Angle versus Rey Mysterio. SummerSlam 2002 is widely regarded among fans and critics as the greatest SummerSlam of all time as well as one of the greatest professional wrestling pay-per-views of all time, often receiving comparisons to WrestleMania X-Seven from the previous year in 2001.