Zero1 International Junior Heavyweight Championship

The Zero1 International Junior Heavyweight Championship is a professional wrestling title in Japanese promotion Pro Wrestling Zero1 (formerly Pro Wrestling Zero-One) and sanctioned by the Wrestling Superstars Live promotion, contested exclusively among junior heavyweight (<100 kg (220 lbs) wrestlers. It was originally created on June 29, 2002 as the NWA/UPW/Zero-One International Junior Heavyweight Championship, symbolizing Zero-One's relationship with the NWA and UPW; Leonardo Spanky defeated Smelly to become the first champion. When Zero-One left the NWA on October 31, 2004, the title was renamed to incorporate Steve Corino's Pro Wrestling World-1; the name was further added to when the newly-renamed Zero1-Max joined the AWA on February 28, 2005. On August 26, 2006, when Minoru Fujita won the annual Tenka-Ichi Junior Tournament, it was again renamed the AWA World Junior Heavyweight Championship. When Zero1-Max left the AWA on December 15, 2007, it was renamed again to the Zero1-Max International Junior Heavyweight Championship. Finally, when the company changed its name to Pro Wrestling Zero1 in 2008, the championship followed. There have been a total of 11 recognized champions who have had a combined 16 official reigns.

The championship has been known as:
 * NWA/UPW/Zero-One International Junior Heavyweight Championship (June 29, 2002 – October 31, 2004)
 * Zero-One/UPW/World-1 International Junior Heavyweight Championship (October 31, 2004 – February 28, 2005)
 * AWA/Zero1-Max/UPW/World-1 International Junior Heavyweight Championship (February 28, 2005 – August 26, 2006)
 * AWA World Junior Heavyweight Championship (August 26, 2006 – December 15, 2007)
 * Zero1-Max International Junior Heavyweight Championship (December 15, 2007 – 2008)
 * Zero1 International Junior Heavyweight Championship (Present)

List of reigns by length
As of November 17, 2010.