The 1991 Halloween Havoc was the third annual Halloween Havoc professional wrestling pay-per-view (PPV) event produced by World Championship Wrestling (WCW). The event took place on October 27, 1991, from the UTC Arena in Chattanooga, Tennessee. This was also the first Halloween Havoc held by WCW alone following its split from the National Wrestling Alliance (NWA) in January 1991.

The main event was a two out of three falls match, in which Lex Luger defeated Ron Simmons to retain the WCW World Heavyweight Championship. Another major match at the event was a Chamber of Horrors match between the team of El Gigante, Sting, and The Steiner Brothers (Rick Steiner and Scott Steiner) and the team of Abdullah the Butcher, The Diamond Studd, Cactus Jack, and Big Van Vader. Additionally, Brian Pillman was crowned the inaugural WCW Light Heavyweight Champion at the event by defeating Richard Morton in the finals of a tournament.

In 2014, all of WCW's Halloween Havoc PPVs became available on WWE's streaming service, the WWE Network.