The year 2004 was the 4th year in the history of World Extreme Cagefighting, a mixed martial arts promotion based in the United States. In 2004 WEC held 4 events beginning with, WEC 9: Cold Blooded.
WEC 9: Cold Blooded was an event held on January 16, 2004, at the Tachi Palace in Lemoore, California, United States.
WEC 10: Bragging Rights was an event held on May 21, 2004, at the Tachi Palace in Lemoore, California, United States.
WEC 11: Evolution was an event held on August 20, 2004, at the Tachi Palace in Lemoore, California, United States.
WEC 12: Halloween Fury 3 was an event held on October 21, 2004, at the Tachi Palace in Lemoore, California, United States.