This is a list of World Extreme Cagefighting (WEC) champions at each weight class. In December 2006 World Extreme Cagefighting was bought by Zuffa, LLC, the parent company of the UFC, to concentrate on the four smaller weight classes under the Unified Rules of Mixed Martial Arts. Over the next two years, the WEC would phase out weight classes above 155 lbs, with most of the fighters going to the UFC. By the time of the WEC's absorption into the UFC at the end of 2010, the only remaining weight divisions were Lightweight, Featherweight and Bantamweight.
