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.

World Title histories

Super Heavyweight Championship

Heavyweight Championship

Light Heavyweight Championship

Middleweight Championship

Welterweight Championship

Lightweight Championship

Featherweight Championship

Bantamweight Championship

North American Title histories

North American Heavyweight Championship

North American Middleweight Championship

North American Lightweight Championship

Native American Title histories

Native American Super Heavyweight Championship

Native American Lightweight Championship

Tournament winners

Records

Most wins in title bouts

Most consecutive title defenses

Champions by nationality

The division champions includes only linear champions. Interim champions who have never become linear champions will be listed as interim champions. Fighters with multiple title reigns in a specific division will also be counted once. Runners-up are not included in tournaments champions.