Sin was a professional wrestling pay-per-view (PPV) event produced by World Championship Wrestling (WCW). It took place on January 14, 2001, from the Conseco Fieldhouse in Indianapolis, Indiana. Sin replaced WCW's January PPV event, Souled Out, which was held from 1997 to 2000.

The main event was for the WCW World Heavyweight Championship between Scott Steiner, Sid Vicious, Jeff Jarrett, and a mystery man that turned out to be Animal in a Four Corners match. The WCW champion heading into Sin was Scott Steiner, who retained the title after pinning Sid Vicious, who had fractured his leg after attempting an aerial attack. The main match on the undercard was between Totally Buff (Lex Luger and Buff Bagwell) and Goldberg and DeWayne Bruce, in a match where if Goldberg lost, he would be (kayfabe) forced to leave WCW. Totally Buff won the match when Lex Luger pinned Goldberg after a Buff Blockbuster from Bagwell with Goldberg on Luger's shoulders. As a result, Goldberg was forced to leave WCW. The rights to WCW Sin have belonged to the World Wrestling Federation (WWF; now WWE) since March 2001.

In 2014, all WCW pay-per-views were made available on the WWE Network.