The 1999 Halloween Havoc was the 11th annual Halloween Havoc professional wrestling pay-per-view (PPV) event produced by World Championship Wrestling (WCW). It took place on October 24, 1999, from the MGM Grand Garden Arena in Las Vegas, Nevada. In 2014, all of WCW's Halloween Havoc PPVs became available on WWE's streaming service, the WWE Network.

Halloween Havoc is a professional wrestling event currently produced by WWE. Since 2020, it has been held annually for the company's developmental brand, NXT. As the name implies, it is a Halloween-themed show held in October.