Vengeance 2001 was the first annual Vengeance professional wrestling pay-per-view event produced by the World Wrestling Federation (WWF). It was presented by Lugz and took place on December 9, 2001 at the San Diego Sports Arena in San Diego, California. The main feature of the event was a three-match tournament to unify the WWF Championship and the unbranded former WCW Championship into what became known as the Undisputed Championship.