The CZW Ultraviolent Underground Championship was a professional hardcore wrestling championship owned by the Combat Zone Wrestling (CZW) promotion.
The inaugural champion was JC Bailey, who defeated Necro Butcher in a Backstage Ultraviolent Underground Barbed Wire Cage of Death Light Tubes Scaffold Death match on February 5, 2005 at CZW's Only the Strong event.
Bailey, Brain Damage, Nick Gage, Danny Havoc and Drake Younger are all tied for the record of most reigns, with 2 each.
At 379 days, Danny Havoc's first reign is the longest in the title's history.
Younger's combined 2 reigns hold the record for most days as champion at 454.