The IWGP U-30 Openweight Championship was a professional wrestling championship in New Japan Pro Wrestling for wrestlers under the age of 30. It was proposed as part of a tournament called the G2 U-30 Climax by Hiroshi Tanahashi, who ended up winning the tournament in April 2003. The U-30 Championship became officially recognized as an IWGP title in November 2004. After Tanahashi vacated the title on June 7, 2006 to focus on the IWGP Heavyweight Championship, the U-30 Championship was deemphasized and soon deactivated.
|Hiroshi Tanahashi||1||April 23, 2003||Hiroshima, Japan||Defeated Shinya Makabe in a tournament final.|
|Shinsuke Nakamura||1||January 4, 2005||Tokyo, Japan||Won the title at Toukon Festival ~ Wrestling World 2005.|
|Vacated by company request on May 1, 2005.|
|Hiroshi Tanahashi||2||June 18, 2005||Kyoto, Japan||Defeated Toru Yano in a tournament final.|
|Vacated by Tanahashi on June 7, 2006 to focus on the IWGP Heavyweight Championship.|