| WEC 13: Heavyweight Explosion | |
| Promotion: | World Extreme Cagefighting |
| Date: | January 22, 2005 |
| Venue: | Tachi Palace Hotel & Casino |
| Previousevent: | WEC 12: Halloween Fury 3 |
| Followingevent: | WEC 14: Vengeance |
WEC 13: Heavyweight Explosion was a mixed martial arts event promoted by World Extreme Cagefighting on January 22, 2005 at the Tachi Palace Hotel & Casino in Lemoore, California. The card featured a 4-man Heavyweight Tournament featuring Brandon Vera as well as single fights which saw the likes of Jason "The Punisher" Lambert, Brad Imes, and MMA legend "Mr. International" Shonie Carter compete.