The World Boxing Union (WBU) was a boxing sanctioning body. The original WBU was founded in January 1995 by IBF European representative, boxing journalist, actor and former holder of the title of Britain's heaviest man, Jon W. Robinson. It sanctioned boxing with various promoters worldwide. Following Robinson's death in 2004, the organization became dormant and was eventually dissolved.

List of WBU heavyweight champions

Other WBU champions (selected)

Other past WBU champions include Sirimongkol Singwancha, Sornpichai Kratingdaenggym, Pongsaklek Wonjongkam, Ricky Hatton, Eamonn Magee, Tony Oakey, Corrie Sanders, Enzo Maccarinelli, Lee McAllister, Angel Manfredy, George Scott, Hasim Rahman,Don Dieg Poeder, Willie Limond, Craig Docherty, Michael Gomez, Kevin Lear, Anthony Farnell, Jimmy Lange, Derry Mathews, Choi Tseveenpurev, Jeremy Williams, Cristian Charquero, Wayne Elcock, Roy Jones Jr., David Burke, Vinny Pazienza, Agostino Cardamone and Micky Ward. In addition, Carlos Contreras defeated challenger Victor Rabanales by 8 RTKO.